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Long-Term Debt - Subordinated Debentures (Details) - Subordinated debt - USD ($)
$ in Millions
6 Months Ended
Jul. 28, 2020
Jun. 30, 2020
May 01, 2019
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 10.9
Interest rate   6.50%  
Percentage of debentures, decrease to Tier 2 treatment, per year   20.00%  
Decrease to Tier 2 treatment, period of recognition   5 years  
Percentage of debentures, measured as Tier 2   40.00%  
Subsequent event | 5.75% Fixed to floating subordinated notes      
Debt Instrument [Line Items]      
Interest rate 5.75%    
Subsequent event | 5.75% Fixed to floating subordinated notes | Private placement      
Debt Instrument [Line Items]      
Sale of equity $ 65.0