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DEPOSITS - Composition of Deposits (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Deposits [Abstract]    
Noninterest-bearing deposits $ 3,770,852 $ 3,325,547
Interest-bearing deposits:    
Demand 1,395,209 1,292,164
Money market savings 3,371,400 3,339,645
Regular savings 465,125 418,051
Time deposits of less than $100,000 474,684 509,919
Time deposits greater than $100,000 and less than $250,000 774,668 670,717
Time deposits of $250,000 or more 425,814 477,026
Total interest-bearing deposits 6,906,900 6,707,522
Total deposits $ 10,677,752 $ 10,033,069