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Interest-Bearing Deposits - Components of Interest-Bearing Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deposits [Abstract]    
Interest-bearing demand deposits $ 291,476 $ 250,353
Savings deposits 4,647,197 4,305,391
Time deposits 385,043 562,964
Total interest-bearing deposits $ 5,323,716 $ 5,118,708