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BORROWINGS Borrowings - - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned $ 95,900 $ 126,700
Federal Funds Purchased 255,800 166,600
FHLB short-term borrowings 217,000 0
Long-term Debt 313,039 776,202
Secured Debt 0 $ 434,982
Long Term Debt Percentage in Basis Points   35
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 $ 313,020 $ 321,384
Debt, Weighted Average Interest Rate 4.81% 4.86%
Advances from Federal Home Loan Banks $ 0 $ 19,971
Federal Home Loan Bank 0.00% 1.43%
Weighted average rate on other long-term debt 0.00% 0.00%
Private Placement [Member]    
Subordinated debt $ 8,400  
Debt, Weighted Average Interest Rate 6.00%  
Long-term Debt [Member]    
Subordinated Borrowing, Interest Rate 5.25%  
Private Placement [Member]    
DebtInstrumentMinimumCallablePeriod 5 years  
Subordinated Debt [Member]    
Subordinated debt $ 49,500  
Debt Instrument Maturity Period 30 years  
DebtInstrumentMinimumCallablePeriod 5 years