DEPOSITS (Deposit Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deposit Liabilities [Line Items]
Non-interest-bearing checking	$ 4,792,369	$ 6,176,998
Interest-bearing checking	2,098,526	1,811,153
Regular savings accounts	2,980,530	2,710,090
Money market accounts	1,680,605	2,198,288
Total interest-bearing transaction and savings accounts	6,759,661	6,719,531
Time deposits equal to or greater than $250,000	473,124	178,324
Certificates of deposit less than $250,000	1,004,343	545,206
Interest-bearing certificates	1,477,467	723,530
Total deposits	13,029,497	13,620,059
Included in total deposits:
Public fund transaction accounts	356,615	392,859
Public fund interest-bearing certificates	52,048	26,810
Total public deposits	408,663	419,669
Total brokered deposits	108,058	0
Related Party Deposit Liabilities	$ 9,200	$ 9,700