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BORROWINGS Borrowings - - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Apr. 01, 2018
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned $ 0 $ 51,300  
Federal Funds Purchased 3,500 0  
FHLB short-term borrowings 972,600 225,000  
Line of Credit Facility, Maximum Borrowing Capacity 40,000    
Short-term Debt 1,161,047 296,203  
Long-term Debt 355,116 409,832  
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 $ 313,591 $ 313,248  
Debt, Weighted Average Interest Rate 5.29% 4.86%  
Weighted average rate on other long-term debt 0.00% 0.00%  
Short-term Debt      
Short-term Debt $ 184,912 $ 20,000  
Long-term Debt [Member]      
Subordinated Borrowing, Interest Rate 5.25%    
Subordinated Debt [Member]      
Subordinated debt $ 43,600 $ 43,200 $ 49,500
Debt Instrument Maturity Period 30 years    
DebtInstrumentMinimumCallablePeriod 5 years