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Components of Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deposits By Type [Line Items]    
Noninterest-bearing demand deposits $ 451,511 $ 417,729
Interest-bearing deposits:    
Interest-bearing demand deposits 347,705 353,874
Money market accounts 213,982 225,196
Savings deposits 316,603 300,282
Certificates of deposit 408,519 557,352
Individual retirement accounts 134,939 146,326
Total interest-bearing deposits 1,421,748 1,583,030
Total deposits $ 1,873,259 $ 2,000,759