DEPOSITS - Composition of Deposits (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deposits [Abstract]
Noninterest-bearing deposits	$ 3,987,411	$ 3,325,547
Interest-bearing deposits:
Demand	1,399,060	1,292,164
Money market savings	3,595,643	3,339,645
Regular savings	496,432	418,051
Time deposits of less than $100,000	435,139	509,919
Time deposits greater than $100,000 and less than $250,000	643,414	670,717
Time deposits of $250,000 or more	430,301	477,026
Total interest-bearing deposits	6,999,989	6,707,522
Total deposits	$ 10,987,400	$ 10,033,069