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Deposits - Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deposits [Line Items]    
Noninterest-bearing demand deposits $ 709,760 $ 642,129
Interest-bearing demand deposits 1,159,296 864,026
Money market (variable rate) 522,382 420,123
Savings deposits 563,952 400,187
Other certificates and time deposits 514,177 441,087
Total deposits 3,931,002 3,139,376
Certificates of Deposit of $250,000 or More [Member]    
Deposits [Line Items]    
Certificates of deposit $ 461,435 $ 371,824