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Deposits - Summary of Balances of Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deposits [Abstract]    
Noninterest-bearing demand $ 2,979,882 $ 2,581,517
Interest-bearing demand 1,568,682 1,414,908
Savings 2,520,959 2,164,942
Time certificates, $250,000 and over 44,652 73,147
Other time certificates 252,984 271,420
Total deposits $ 7,367,159 $ 6,505,934