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Interest-Bearing Deposits - Components of Interest-Bearing Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deposits [Abstract]    
Interest-bearing demand deposits $ 254,981 $ 180,209
Savings deposits 3,896,536 3,401,354
Time deposits 835,851 850,216
Total interest-bearing deposits $ 4,987,368 $ 4,431,779