BORROWINGS Borrowings - - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Apr. 01, 2018
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned	$ 0	$ 0
Federal Funds Purchased	0	0
FHLB short-term borrowings	765,000	800,000
Line of Credit Facility, Maximum Borrowing Capacity	40,000
Short-term Debt	811,653	937,814
Long-term Debt	344,086	344,115
Convertible Subordinated Debt	$ 150,000
Subordinated Borrowing, Interest Rate	5.13%
Debt Instrument, Basis Spread on Variable Rate	5.09%
Subordinated debt	$ 120,000
Subordinated debt	$ 314,505	$ 314,163
Debt, Weighted Average Interest Rate	5.50%	5.60%
Weighted average rate on other long-term debt	0.00%	0.00%
Other Notes payable interest rate	4.61%	4.40%
Short-term Debt
Short-term Debt	$ 46,653	$ 137,814
Federal Home Loan Bank Borrowings
Short-term Debt	$ 765,000	800,000
Long-term Debt [Member]
Subordinated Borrowing, Interest Rate	5.25%
Subordinated Debt [Member]
Subordinated debt	$ 44,500	$ 44,200	$ 49,500
Debt Instrument Maturity Period	30 years
DebtInstrumentMinimumCallablePeriod	5 years