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Repurchase Agreements and Other Borrowings - Additional Information (Details) - USD ($)
 12 Months Ended
Oct. 06, 2020
Dec. 31, 2020
Dec. 31, 2019
May 01, 2018
Sep. 08, 2016
Apr. 26, 2006
Feb. 27, 2004
Repurchase Agreements And Other Borrowings [Line Items]              
Federal Home Loan Bank Advances   $ 94,000,000          
Repurchase agreements with customers   206,937,000 $ 208,109,000        
Securities sold under agreements to repurchase increase (decrease)   $ (1,200,000)          
Securities sold under agreements to repurchase weighted average rate   0.16%          
Debt issuance costs   $ 1,800,000          
Debt issuance discount   1,400,000          
Subordinated debt, net   94,253,000 0        
Junior subordinated debentures, net   19,027,000 $ 18,858,000        
Junior Subordinated Debentures              
Repurchase Agreements And Other Borrowings [Line Items]              
Junior subordinated debentures, net   $ 19,027,000          
3.95% Subordinated Notes due 2030              
Repurchase Agreements And Other Borrowings [Line Items]              
Aggregate principal amount $ 96,000,000.0            
Fixed-to-Floating Rate 3.95%            
Maturity date Oct. 15, 2030            
Basis points 3.83%            
Redemption description   The Company may, beginning with the interest payment date of October 15, 2025, and on any interest payment date thereafter, redeem the Notes, in whole or in part, at a redemption price equal to 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest to but excluding the date of redemption. The Company may also redeem the Notes at any time, including prior to October 15, 2025, at the Company’s option, in whole but not in part, if: (i) a change or prospective change in law occurs that could prevent the Company from deducting interest payable on the Notes for U.S. federal income tax purposes; (ii) a subsequent event occurs that could preclude the Notes from being recognized as Tier 2 capital for regulatory capital purposes; or (iii) the Company is required to register as an investment company under the Investment Company Act of 1940, as amended; in each case, at a redemption price equal to 100% of the principal amount of the Notes plus any accrued and unpaid interest to but excluding the redemption date.          
3.95% Subordinated Notes due 2030 | SOFR              
Repurchase Agreements And Other Borrowings [Line Items]              
Description floating rate basis   three-month Term SOFR          
Fmis Trust I              
Repurchase Agreements And Other Borrowings [Line Items]              
Trust preferred securities issued             $ 10,000,000
Investment in statutory trust             $ 310,000
FMIS Trust II              
Repurchase Agreements And Other Borrowings [Line Items]              
Trust preferred securities issued           $ 10,000,000  
Investment in statutory trust           $ 310,000  
Junior subordinated debentures, net   $ 10,310,000          
FMIS Trust II | Junior Subordinated Debentures              
Repurchase Agreements And Other Borrowings [Line Items]              
Fixed-to-Floating Rate   1.82% 3.49%        
Debt instrument, interest rate terms   bore interest at a fixed rate of 6.98% paid quarterly until June 15, 2011 and then converted to floating rate (LIBOR plus 160 basis points) after June 15, 2011          
CLS Trust I              
Repurchase Agreements And Other Borrowings [Line Items]              
Trust preferred securities issued         $ 4,000,000    
Investment in statutory trust         $ 124,000    
CLS Trust I | Junior Subordinated Debentures              
Repurchase Agreements And Other Borrowings [Line Items]              
Fixed-to-Floating Rate   2.07% 3.74%        
Debt instrument, interest rate terms   bear interest at three-month LIBOR plus 185 basis points          
FBTCST I              
Repurchase Agreements And Other Borrowings [Line Items]              
Trust preferred securities issued       $ 6,000,000      
Investment in statutory trust       $ 186,000      
FBTCST I | Junior Subordinated Debentures              
Repurchase Agreements And Other Borrowings [Line Items]              
Fixed-to-Floating Rate   1.92% 3.59%        
Debt instrument, interest rate terms   bear interest at three-month LIBOR plus 170 basis points          
Revolving Credit Facility              
Repurchase Agreements And Other Borrowings [Line Items]              
Line of credit facility, maximum borrowing capacity   $ 15,000,000          
Line of credit facility, interest rate spread   2.25%