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Borrowings - Narrative (Details)
9 Months Ended
Sep. 30, 2021
USD ($)
quarters
trustSubsidiary
Dec. 31, 2020
Oct. 28, 2020
USD ($)
Debt Instrument [Line Items]      
Interest rate 0.00% 6.125%  
Number of trust subsidiaries | trustSubsidiary 9    
Number of quarters that interest payment can be deferred | quarters 20    
Payment of interest on trust preferred securities $ 0    
Subordinated notes maturing in 2030      
Debt Instrument [Line Items]      
Interest rate 4.125% 4.125% 4.125%
Senior Notes      
Debt Instrument [Line Items]      
Outstanding debt $ 0    
Subordinated Debt | Subordinated notes maturing in 2030      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 150,000,000