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BORROWINGS Borrowings - - Additional Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 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 1,040,000 800,000  
Line of Credit Facility, Maximum Borrowing Capacity 40,000    
Short-term Debt 1,179,172 937,814  
Long-term Debt 338,556 344,115  
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 $ 314,391 $ 314,163  
Debt, Weighted Average Interest Rate 5.59% 5.60%  
Weighted average rate on other long-term debt 0.00% 0.00%  
Other Notes payable interest rate 4.40% 4.40%  
Short-term Debt      
Short-term Debt $ 139,172 $ 137,814  
Federal Home Loan Bank Borrowings      
Short-term Debt $ 1,040,000 800,000  
Long-term Debt [Member]      
Subordinated Borrowing, Interest Rate 5.25%    
Subordinated Debt [Member]      
Subordinated debt $ 44,400 $ 44,200 $ 49,500
Debt Instrument Maturity Period 30 years    
DebtInstrumentMinimumCallablePeriod 5 years