Annual report pursuant to Section 13 and 15(d)

Deposits - Summary of Interest Expense on Deposits (Detail)

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Deposits - Summary of Interest Expense on Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Time Deposits [Abstract]      
Savings $ 1,646us-gaap_InterestExpenseSavingsDeposits $ 1,812us-gaap_InterestExpenseSavingsDeposits $ 2,152us-gaap_InterestExpenseSavingsDeposits
Money market checking and NOW accounts 3,213us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits 2,912us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits 3,085us-gaap_InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits
Time deposits of $100,000 or more 4,321us-gaap_InterestExpenseTimeDeposits100000OrMore 4,094us-gaap_InterestExpenseTimeDeposits100000OrMore 7,290us-gaap_InterestExpenseTimeDeposits100000OrMore
Other time deposits 4,380us-gaap_InterestExpenseOtherDomesticDeposits 3,860us-gaap_InterestExpenseOtherDomesticDeposits 3,350us-gaap_InterestExpenseOtherDomesticDeposits
Total interest expense on deposits $ 13,560us-gaap_InterestExpenseDeposits $ 12,678us-gaap_InterestExpenseDeposits $ 15,877us-gaap_InterestExpenseDeposits