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BORROWINGS Borrowings - - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned $ 95,500 $ 85,500
FHLB short-term borrowings 952,400 857,100
Line of Credit Facility, Maximum Borrowing Capacity 30,000  
Commitments outstanding to extend credit 0 0
Long-term Debt 546,423 570,739
Subordinated debt $ 120,000  
Subordinated Borrowing, Interest Rate 5.125%  
Subordinated debt $ 170,654 $ 170,550
Debt, Weighted Average Interest Rate 5.21% 5.28%
Advances from Federal Home Loan Banks $ 376,134 $ 400,599
Federal Home Loan Bank 2.14% 2.08%
Private Placement [Member]    
Subordinated debt $ 8,400  
Debt, Weighted Average Interest Rate 7.40%  
Private Placement [Member]    
DebtInstrumentMinimumCallablePeriod 5 years  
Subordinated Debt [Member]    
Subordinated debt $ 49,500  
Debt Instrument Maturity Period 30 years  
DebtInstrumentMinimumCallablePeriod 5 years