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Summary of Significant Accounting Polocies Summary of Significant Accounting Policies (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
shares
Sep. 30, 2018
subsidiary_trust
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Temporary Equity [Line Items]          
Interest payment deferral period     5 years    
Number of subsidiary trusts | subsidiary_trust     6    
Cash       $ 1,900 $ 1,900
Cash and cash equivalents       $ 13,078 $ 14,619
Preferred stock issued (in shares) | shares       222,876 222,876
Preferred stock outstanding (in shares) | shares       222,876 222,876
Redemption amount       $ 7,591 $ 7,278
Subsequent Event          
Temporary Equity [Line Items]          
Preferred stock issued (in shares) | shares   182,876      
Preferred stock outstanding (in shares) | shares   182,876      
Redemption amount   $ 6,700      
Interest expense on trust preferred securities $ 14,900 $ 10,500