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Deposits - Total Deposits (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]    
Percentage Change, Checking, non-interest bearing 1.30%  
Percentage Change, Checking, interest bearing 0.10%  
Percentage Change, Savings accounts 2.70%  
Percentage Change, Certificates of deposit (6.80%)  
Percentage change, Total 0.70%  
Checking, non-interest bearing $ 291,579 $ 289,922
Checking, interest bearing 543,534 543,388
Savings accounts 976,634 953,438
Certificates of deposit 213,732 230,774
Total deposits $ 2,025,479 $ 2,017,522