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Deposits - Summary of Balances of Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deposits [Abstract]    
Noninterest-bearing demand $ 1,832,665 $ 1,760,580
Interest-bearing demand 1,242,274 1,252,366
Savings 1,851,549 1,921,324
Time certificates, $250,000 and over 129,061 132,429
Other time certificates 311,445 299,767
Total deposits $ 5,366,994 $ 5,366,466