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Repurchase Agreements and Other Borrowings - Additional Information (Details)
 12 Months Ended
Aug. 15, 2023
USD ($)
Quarters
shares
Oct. 06, 2020
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Dec. 31, 2023
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Dec. 31, 2022
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Dec. 31, 2021
USD ($)
May 01, 2018
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Sep. 08, 2016
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Dec. 31, 2007
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Apr. 26, 2006
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Repurchase Agreements And Other Borrowings [Line Items]                  
Federal Home Loan Bank Advances     $ 263,600,000            
Repurchase agreements with customers     213,721,000 $ 221,414,000          
Securities sold under agreements to repurchase increase (decrease)     $ (7,700,000)            
Securities sold under agreements to repurchase weighted average rate     2.93%            
Subordinated Debentures     $ 106,755,000 94,553,000          
Junior subordinated debentures, net     24,058,000 $ 19,364,000          
Junior Subordinated Debentures                  
Repurchase Agreements And Other Borrowings [Line Items]                  
Junior subordinated debentures, net     $ 24,058,000            
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 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     7.25% 6.37%          
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            
BHS Trust I                  
Repurchase Agreements And Other Borrowings [Line Items]                  
Number of consecutive quarters that interest payments on subordinated debentures may be deferred | Quarters 20                
Fixed-to-Floating Rate     8.87%            
Basis points 3.25%                
Preferred and Common Ownership Shares Issued 100.00%                
Subordinated Debentures $ 7,200,000                
Redeeemed Subordinated Debentures               $ 6,200,000  
Common Ownership Shares | shares 217,000                
Trust preferred securities issued $ 7,000,000                
Debt instrument, interest rate terms     three-month LIBOR            
BHS Trust II                  
Repurchase Agreements And Other Borrowings [Line Items]                  
Number of consecutive quarters that interest payments on subordinated debentures may be deferred | Quarters 20                
Fixed-to-Floating Rate     7.69%            
Basis points 2.05%                
Preferred and Common Ownership Shares Issued 100.00%                
Subordinated Debentures $ 4,100,000                
Common Ownership Shares | shares 124,000                
Trust preferred securities issued $ 4,000,000                
Debt instrument, interest rate terms     three-month LIBOR            
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     7.50% 6.47%          
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     7.35% 6.62%          
Debt instrument, interest rate terms     bear interest at three-month LIBOR plus 170 basis points            
Blackhawk                  
Repurchase Agreements And Other Borrowings [Line Items]                  
Aggregate principal amount $ 15,000,000                
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00%                
Blackhawk | 3.50%                  
Repurchase Agreements And Other Borrowings [Line Items]                  
Aggregate principal amount $ 7,500,000                
Interest rate (as a percent) 3.50%                
Debt instrument, maturity month and year 2031-05                
Basis points 2.85%                
Blackhawk | 3.50% | SOFR                  
Repurchase Agreements And Other Borrowings [Line Items]                  
Description floating rate basis     three-month SOFR            
Blackhawk | 3.875%                  
Repurchase Agreements And Other Borrowings [Line Items]                  
Aggregate principal amount $ 7,500,000                
Interest rate (as a percent) 3.875%                
Debt instrument, maturity month and year 2036-05                
Basis points 2.55%                
Blackhawk | 3.875% | SOFR                  
Repurchase Agreements And Other Borrowings [Line Items]                  
Description floating rate basis three-month SOFR                
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%