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BORROWINGS Borrowings - - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Subordinated Debt   $ 321,384 $ 170,967
Debt, Weighted Average Interest Rate   4.86% 4.97%
Subordinated debt, original issue   $ 120,000  
Subordinated Borrowing, Interest Rate   5.13%  
Book value of FHLB collateral   $ 6,300,000  
Convertible Subordinated Debt   $ 150,000  
Debt Instrument, Basis Spread on Variable Rate   5.09%  
Secured Debt   $ 434,982 $ 0
Long Term Debt Percentage in Basis Points   35  
Federal Home Loan Bank   1.43% 1.94%
Repayments of Debt, Maturing in More than Three Months   $ 120,000  
Private Placement [Member]      
Debt Instrument [Line Items]      
Subordinated Debt   $ 8,400  
Debt, Weighted Average Interest Rate   6.00%  
Long-term Debt [Member]      
Debt Instrument [Line Items]      
Subordinated Borrowing, Interest Rate   5.25%  
Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Subordinated Debt   $ 49,500  
Debt Instrument Maturity Period   30 years  
DebtInstrumentMinimumCallablePeriod   5 years  
Private Placement [Member]      
Debt Instrument [Line Items]      
DebtInstrumentMinimumCallablePeriod 5 years