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Deposits - Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deposits [Line Items]    
Noninterest-bearing demand deposits $ 642,129 $ 601,805
Interest-bearing demand deposits 864,026 909,638
Money market (variable rate) 420,123 378,108
Savings deposits 400,187 424,500
Other certificates and time deposits 441,087 436,367
Total deposits 3,139,376 2,881,003
Certificates of Deposit of $250,000 or More [Member]    
Deposits [Line Items]    
Certificates of deposit $ 371,824 $ 130,585