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Deposits - Summary of Balances of Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deposits [Abstract]    
Noninterest-bearing demand $ 2,581,517 $ 1,832,665
Interest-bearing demand 1,414,908 1,242,274
Savings 2,164,942 1,851,549
Time certificates, $250,000 and over 73,147 129,061
Other time certificates 271,420 311,445
Total deposits $ 6,505,934 $ 5,366,994