Annual report pursuant to Section 13 and 15(d)

FHLB Advances and Other Borrowings - Summary of Contractual Maturities Pertaining to FHLB (Detail)

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FHLB Advances and Other Borrowings - Summary of Contractual Maturities Pertaining to FHLB (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Federal Home Loan Bank, Advances, Rolling Maturity [Abstract]    
Year of Maturity, 2015, Amount $ 150,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate $ 127,546us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
Year of Maturity, Total Amount $ 150,000us-gaap_AdvancesFromFederalHomeLoanBanks $ 127,546us-gaap_AdvancesFromFederalHomeLoanBanks
Year of Maturity, 2015, Weighted-Average Interest Rate 0.27%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate  
Year of Maturity, Total, Weighted-Average Interest Rate 0.27%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate