Annual report pursuant to Section 13 and 15(d)

FHLB Advances and Other Borrowings - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail)

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FHLB Advances and Other Borrowings - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Federal Home Loan Banks [Abstract]      
Weighted-average interest rate at end of year 0.27%us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd 0.16%us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd 5.27%us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd
Weighted-average interest rate during the year 0.21%us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear 2.28%us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear 5.27%us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear
Average balance of FHLB advances $ 69,781us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageBalanceOfAgreementsOutstanding $ 6,573us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageBalanceOfAgreementsOutstanding $ 3,354us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageBalanceOfAgreementsOutstanding
Maximum amount outstanding at any month-end $ 150,000us-gaap_FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd $ 127,546us-gaap_FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd $ 3,273us-gaap_FederalHomeLoanBankAdvancesActivityForYearMaximumOutstandingAtAnyMonthEnd