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Quarterly Financial Data (Unaudited) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Interest income | $ 38,163us-gaap_InterestAndDividendIncomeOperating | $ 36,857us-gaap_InterestAndDividendIncomeOperating | $ 35,424us-gaap_InterestAndDividendIncomeOperating | $ 34,281us-gaap_InterestAndDividendIncomeOperating | $ 33,725us-gaap_InterestAndDividendIncomeOperating | $ 32,499us-gaap_InterestAndDividendIncomeOperating | $ 30,692us-gaap_InterestAndDividendIncomeOperating | $ 29,165us-gaap_InterestAndDividendIncomeOperating | $ 144,725us-gaap_InterestAndDividendIncomeOperating | $ 126,081us-gaap_InterestAndDividendIncomeOperating | $ 109,023us-gaap_InterestAndDividendIncomeOperating |
| Interest expense | 3,703us-gaap_InterestExpense | 3,538us-gaap_InterestExpense | 3,446us-gaap_InterestExpense | 3,432us-gaap_InterestExpense | 3,610us-gaap_InterestExpense | 3,534us-gaap_InterestExpense | 3,211us-gaap_InterestExpense | 3,264us-gaap_InterestExpense | 14,119us-gaap_InterestExpense | 13,619us-gaap_InterestExpense | 14,901us-gaap_InterestExpense |
| Net interest income | 34,460us-gaap_InterestIncomeExpenseNet | 33,319us-gaap_InterestIncomeExpenseNet | 31,978us-gaap_InterestIncomeExpenseNet | 30,849us-gaap_InterestIncomeExpenseNet | 30,115us-gaap_InterestIncomeExpenseNet | 28,965us-gaap_InterestIncomeExpenseNet | 27,481us-gaap_InterestIncomeExpenseNet | 25,901us-gaap_InterestIncomeExpenseNet | 130,606us-gaap_InterestIncomeExpenseNet | 112,462us-gaap_InterestIncomeExpenseNet | 94,122us-gaap_InterestIncomeExpenseNet |
| Provision for loan losses | 2,759us-gaap_ProvisionForLoanAndLeaseLosses | 2,748us-gaap_ProvisionForLoanAndLeaseLosses | 2,438us-gaap_ProvisionForLoanAndLeaseLosses | 2,314us-gaap_ProvisionForLoanAndLeaseLosses | 2,356us-gaap_ProvisionForLoanAndLeaseLosses | 3,034us-gaap_ProvisionForLoanAndLeaseLosses | 3,334us-gaap_ProvisionForLoanAndLeaseLosses | 4,284us-gaap_ProvisionForLoanAndLeaseLosses | 10,259us-gaap_ProvisionForLoanAndLeaseLosses | 13,008us-gaap_ProvisionForLoanAndLeaseLosses | 9,100us-gaap_ProvisionForLoanAndLeaseLosses |
| Net income available to common stockholders | $ 14,917us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 13,902us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 11,469us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 11,658us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 11,752us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 10,712us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,586us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,151us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 51,946us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 41,201us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 34,045us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
| Net income per common share, basic | $ 0.60us-gaap_EarningsPerShareBasic | $ 0.56us-gaap_EarningsPerShareBasic | $ 0.49us-gaap_EarningsPerShareBasic | $ 0.53us-gaap_EarningsPerShareBasic | $ 0.55us-gaap_EarningsPerShareBasic | $ 0.51us-gaap_EarningsPerShareBasic | $ 0.46us-gaap_EarningsPerShareBasic | $ 0.48us-gaap_EarningsPerShareBasic | $ 2.18us-gaap_EarningsPerShareBasic | $ 2.00us-gaap_EarningsPerShareBasic | $ 1.89us-gaap_EarningsPerShareBasic |
| Net income per common share, diluted | $ 0.58us-gaap_EarningsPerShareDiluted | $ 0.54us-gaap_EarningsPerShareDiluted | $ 0.46us-gaap_EarningsPerShareDiluted | $ 0.51us-gaap_EarningsPerShareDiluted | $ 0.53us-gaap_EarningsPerShareDiluted | $ 0.49us-gaap_EarningsPerShareDiluted | $ 0.45us-gaap_EarningsPerShareDiluted | $ 0.43us-gaap_EarningsPerShareDiluted | $ 2.09us-gaap_EarningsPerShareDiluted | $ 1.90us-gaap_EarningsPerShareDiluted | $ 1.66us-gaap_EarningsPerShareDiluted |
| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The net amount of operating interest income (expense). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of expense related to estimated loss from loan and lease transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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