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Components of Deposits (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Deposits By Type [Line Items]    
Noninterest-bearing demand deposits $ 424,438 $ 417,729
Interest-bearing deposits:    
Interest-bearing demand deposits 329,583 353,874
Money market accounts 214,735 225,196
Savings deposits 313,268 300,282
Certificates of deposit 497,463 557,352
Individual retirement accounts 140,734 146,326
Total interest-bearing deposits 1,495,783 1,583,030
Total deposits $ 1,920,221 $ 2,000,759