DEPOSITS (Deposit Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Deposits:
Non-interest-bearing accounts	$ 4,688,244	$ 4,792,369
Interest-bearing checking	2,344,561	2,098,526
Regular savings accounts	3,339,859	2,980,530
Money market accounts	1,643,631	1,680,605
Total interest-bearing transaction and savings accounts	7,328,051	6,759,661
Certificates of Deposit Greater Than or Equal to $250,000	500,991	473,124
Certificates of Deposit Less Than $250,000	1,020,862	1,004,343
Total certificates of deposit	1,521,853	1,477,467
Total deposits	13,538,148	13,029,497
Included in total deposits:
Public fund transaction and savings accounts	387,873	356,615
Public fund interest-bearing certificates	28,144	52,048
Total public deposits	416,017	408,663
Total brokered certificates of deposit	$ 50,333	$ 108,058