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Analysis of Allowance For Loan Losses By Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2012
Commercial Financial and Agricultural Financing Receivable [Member]
|
Dec. 31, 2011
Commercial Financial and Agricultural Financing Receivable [Member]
|
Dec. 31, 2009
Commercial Financial and Agricultural Financing Receivable [Member]
|
Dec. 31, 2012
Commercial Real Estate Construction Financing Receivable [Member]
|
Dec. 31, 2011
Commercial Real Estate Construction Financing Receivable [Member]
|
Dec. 31, 2009
Commercial Real Estate Construction Financing Receivable [Member]
|
Dec. 31, 2012
Residential Real Estate Mortgage Loans [Member]
|
Dec. 31, 2011
Residential Real Estate Mortgage Loans [Member]
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Dec. 31, 2009
Residential Real Estate Mortgage Loans [Member]
|
Dec. 31, 2012
Consumer Portfolio Segment [Member]
|
Dec. 31, 2011
Consumer Portfolio Segment [Member]
|
Dec. 31, 2009
Consumer Portfolio Segment [Member]
|
Dec. 31, 2012
Qualitative Factors (Member)
|
Dec. 31, 2011
Qualitative Factors (Member)
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| Allowance for loan losses: | |||||||||||||||||
| Balance, beginning of year | $ 22,030 | $ 18,077 | $ 14,737 | $ 6,627 | $ 5,348 | $ 3,135 | $ 6,542 | $ 6,373 | $ 6,295 | $ 3,295 | $ 2,443 | $ 2,102 | $ 531 | $ 749 | $ 115 | $ 5,035 | $ 3,164 |
| Chargeoffs | (5,755) | (5,653) | (7,208) | (1,106) | (1,096) | (3,088) | (2,594) | (660) | (1,096) | (901) | (867) | 0 | 0 | ||||
| Recoveries | 883 | 634 | 198 | 125 | 361 | 58 | 180 | 692 | 12 | 8 | 81 | 0 | 0 | ||||
| Provision | 9,100 | 8,972 | 10,350 | 2,587 | 2,014 | 2,999 | 2,583 | 1,585 | 1,936 | 561 | 568 | 1,368 | 1,871 | ||||
| Balance, end of year | 26,258 | 22,030 | 18,077 | 8,233 | 6,627 | 3,135 | 6,511 | 6,542 | 6,295 | 4,912 | 3,295 | 2,102 | 199 | 531 | 115 | 6,403 | 5,035 |
| Individually Evaluated for Impairment | 3,511 | 4,181 | 577 | 1,382 | 1,013 | 1,533 | 1,921 | 941 | 0 | 325 | 0 | 0 | |||||
| Collectively Evaluated for Impairment | 22,747 | 17,849 | 7,656 | 5,245 | 5,498 | 5,009 | 2,991 | 2,354 | 199 | 206 | 6,403 | 5,035 | |||||
| Ending Balance | 2,363,182 | 1,830,742 | 1,030,990 | 799,464 | 158,361 | 151,218 | 1,127,549 | 839,034 | 46,282 | 41,026 | 0 | 0 | |||||
| Individually Evaluated for Impairment | 37,394 | 37,253 | 3,910 | 5,578 | 14,422 | 16,262 | 18,927 | 14,866 | 135 | 547 | 0 | 0 | |||||
| Collectively Evaluated for Impairment | $ 2,325,788 | $ 1,793,489 | $ 1,027,080 | $ 793,886 | $ 143,939 | $ 134,956 | $ 1,108,622 | $ 824,168 | $ 46,147 | $ 40,479 | $ 0 | $ 0 | |||||