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DEPOSITS (Composition of Deposits) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deposits [Abstract]    
Noninterest-bearing deposits $ 3,325,547 $ 1,892,052
Interest-bearing deposits:    
Demand 1,292,164 836,433
Money market savings 3,339,645 1,839,593
Regular savings 418,051 329,919
Time deposits of less than $100,000 509,919 463,431
Time deposits greater than $100,000 and less than $250,000 670,717 682,936
Time deposits of $250,000 or more 477,026 395,955
Total interest-bearing deposits 6,707,522 4,548,267
Total deposits $ 10,033,069 $ 6,440,319