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Subordinated Notes (Details) - USD ($)
 12 Months Ended
Jun. 10, 2020
Aug. 08, 2016
Dec. 31, 2020
Dec. 31, 2019
Debt instrument, interest rate terms The notes are due June 15, 2030, and have a fixed interest rate of 5.50% until June 15, 2025, at which time the rate becomes floating at a rate expected to be equal to three-month term Secured Overnight Financing Rate (SOFR) plus 5.325% The notes are due August 15, 2026, and have a fixed interest rate of 5.25% until August 15, 2021, at which time the rate becomes floating at a rate equal to three-month LIBOR plus 4.087%.    
Public offering and sale of subordinated notes $ 75,000,000.0 $ 75,000,000.0    
Amortization of debt discount (Premium)     $ 608,000 $ 434,000
Subordinated Note Interest Rate 5.50% 5.25%    
Subordinated borrowing, interest rate     5.84% 5.89%
Senior Subordinated Notes        
Proceeds from issuance of senior long-term debt $ 73,500,000 $ 73,500,000    
Payment of financing and stock issuance costs $ 1,500,000 $ 1,500,000    
Debt Instrument, Interest Rate, Stated Percentage 5.325%      
Expected life of the notes 5 years 5 years    
Senior Subordinated Notes | 90-day LIBOR        
Debt Instrument, Basis Spread on Variable Rate   4.087%