Annual report pursuant to Section 13 and 15(d)

FEDERAL FUNDS PURCHASED (Additional Information) (Detail)

v2.4.1.9
FEDERAL FUNDS PURCHASED (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Federal Funds Purchased [Line Items]    
Line of Credit, Current $ 160.0us-gaap_LinesOfCreditCurrent $ 130.0us-gaap_LinesOfCreditCurrent
Federal Funds Purchased [Member]    
Federal Funds Purchased [Line Items]    
Short-term Debt $ 264.3us-gaap_ShortTermBorrowings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_FederalFundsPurchasedMember
$ 174.4us-gaap_ShortTermBorrowings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_FederalFundsPurchasedMember
Debt Instrument, Interest Rate, Stated Percentage 0.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_FederalFundsPurchasedMember
0.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_FederalFundsPurchasedMember