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Subordinated Debt (Details Textual) - Subordinated Debt - USD ($)
1 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2020
Oct. 20, 2015
2025 Note      
Debt Instrument [Line Items]      
Subordinated debenture, principal amount     $ 10,000,000.0
Fixed annual interest rate (as a percent)     6.4375%
2026 Notes      
Debt Instrument [Line Items]      
Subordinated debenture, principal amount   $ 25,000,000.0  
Fixed annual interest rate (as a percent)   6.00%  
2029 Notes      
Debt Instrument [Line Items]      
Subordinated debenture, principal amount   $ 37,000,000.0  
Fixed annual interest rate (as a percent)   6.00%  
LIBOR | 2026 Notes      
Debt Instrument [Line Items]      
Basis spread on variable rate   485.00%  
LIBOR | 2029 Notes      
Debt Instrument [Line Items]      
Basis spread on variable rate 411.00%