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BORROWINGS Borrowings - - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Secured Debt   $ 0 $ 434,982  
Long Term Debt Percentage in Basis Points     35  
Convertible Subordinated Debt   $ 150,000    
Debt Instrument, Basis Spread on Variable Rate   5.09%    
Subordinated debt, original issue   $ 120,000    
Subordinated Borrowing, Interest Rate   5.13%    
Subordinated Debt   $ 313,248 $ 321,384  
Debt, Weighted Average Interest Rate   4.86% 4.86%  
Notes Payable   $ 96,412 $ 0  
Bank lines of credit credit   $ 23,030 $ 0  
Debt Instrument, Interest Rate, Stated Percentage   2.77% 0.00%  
Notes Payable, Noncurrent   $ 73,382 $ 0  
Other Notes payable interest rate   4.09% 0.00%  
Book value of FHLB collateral   $ 5,800,000    
Federal Home Loan Bank   0.00% 1.43%  
Line of Credit Facility, Maximum Borrowing Capacity   $ 40,000    
Short-term Debt [Line Items]        
Short-term Debt   296,203 $ 166,594 $ 1,316,181
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