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Long-Term Borrowings and Subordinated Debt - Schedule of Long-Term Borrowings, Interest Expense and Weighted Average Interest Rate (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]      
Long-term borrowings $ 19,442us-gaap_OtherLongTermDebt $ 21,810us-gaap_OtherLongTermDebt $ 34,101us-gaap_OtherLongTermDebt
Weighted average interest rate 3.00%us-gaap_LongtermDebtWeightedAverageInterestRate 3.01%us-gaap_LongtermDebtWeightedAverageInterestRate 3.17%us-gaap_LongtermDebtWeightedAverageInterestRate
Interest expense $ 617us-gaap_InterestExpenseLongTermDebt $ 746us-gaap_InterestExpenseLongTermDebt $ 1,107us-gaap_InterestExpenseLongTermDebt