DEPOSITS - Schedule of composition of deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deposits [Abstract]
Noninterest-bearing demand deposits	$ 3,393,666	$ 3,670,267
Interest-bearing transaction deposits	2,857,818	2,720,417
Saving deposits and money market deposits	2,964,421	3,442,244
Time deposits	855,375	935,649
Total deposits	10,071,280	10,768,577
Brokered savings deposits and money market deposits	1,303	2,248
Brokered time deposits	275	266
Total time deposits with a minimum denomination of $100,000	416,445	454,649
Total time deposits with a minimum denomination that meets or exceeds the FDIC insurance limit of $250,000	$ 120,377	$ 137,449