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Subordinated Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Aug. 20, 2020
Dec. 31, 2019
Subordinated Borrowing [Line Items]      
Basis spread on variable rate (percent) 1.48%    
Long-term Debt, Gross   $ 175,000  
Debt Instrument, Interest Rate, Stated Percentage   4.50%  
Long-term Debt $ 32,500   $ 192,500
Debt Issuance Costs, Gross   $ 2,400  
Subordinated debt      
Subordinated Borrowing [Line Items]      
Basis spread on variable rate (percent) 4.39%    
Long-term Debt $ 172,800    
Trust I      
Subordinated Borrowing [Line Items]      
Preferred securities issued 15,000    
Junior subordinated notes      
Subordinated Borrowing [Line Items]      
Junior subordinated debt purchased by Trust I $ 15,500