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Long-Term Debt and Other Borrowed Funds (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
May 31, 2020
Debt Instrument      
Stated interest rate     5.25%
Long-term debt $ 98.7 $ 98.6  
Long-term debt and capital lease obligations 112.4 112.4  
Fiscal Year Maturities of Long-term Debt      
2018 5.2    
2019 0.1    
2020 0.1    
2021 0.1    
2022 0.1    
Thereafter 106.8    
Long-term debt and capital lease obligations 112.4 112.4  
Advances from FHLB 0.0    
Other borrowings 0.0    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 1.3    
FIB      
Fiscal Year Maturities of Long-term Debt      
Ownership percentage in subsidiary 99.90%    
Parent      
Debt Instrument      
Long-term debt $ 98.7 $ 98.6  
Capital lease obligations | Capital Lease Obligation, 8.00% | Subsidiaries      
Debt Instrument      
Stated interest rate   8.00%  
Finance Lease, Liability 1.0 $ 1.1  
Notes payable | Subsidiaries      
Fiscal Year Maturities of Long-term Debt      
Long Term Debt, Acquired or Assumed 12.7    
Notes payable | Note Payable, 1.30%, maturing March 31, 2038 [Member] | Subsidiaries      
Debt Instrument      
Long-term debt 2.0 2.0  
Notes payable | Note Payable, 1.30%, Maturing June 1, 2034 [Member] | Subsidiaries      
Debt Instrument      
Long-term debt $ 0.6 0.6  
Notes payable | Note Payable, Two Point Two Eight Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 2.28%    
Notes payable | Note Payable, One Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 1.00%    
Notes payable | Note Payable, 2.28% | Subsidiaries      
Debt Instrument      
Long-term debt $ 5.0 5.0  
Notes payable | Note Payable, 1.00% | Subsidiaries      
Debt Instrument      
Long-term debt $ 5.1 $ 5.1  
Notes payable | Note Payable, One Point Three Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 1.30%    
Notes payable | Note Payable, One Point Three Zero Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 1.30%    
Notes payable | Note Payable, Three Point Two Five Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 3.25%    
Federal Home Loan Bank | Notes Payable to FHLB | Subsidiaries      
Fiscal Year Maturities of Long-term Debt      
FHLB, advances, maximum amount available $ 2,065.6    
Secured Debt      
Fiscal Year Maturities of Long-term Debt      
Line of credit facility, maximum borrowing capacity 436.7    
Federal Funds Purchased      
Fiscal Year Maturities of Long-term Debt      
Line of credit facility, maximum borrowing capacity 205.0    
Unsecured Debt [Member]      
Fiscal Year Maturities of Long-term Debt      
Line of credit facility, maximum borrowing capacity $ 50.0    
Subordinated term loan | Subordinated Notes Due May 2030      
Fiscal Year Maturities of Long-term Debt      
Debt Instrument, Face Amount     $ 100.0
Minimum | Note Payable, 6.24% | Subsidiaries      
Debt Instrument      
Stated interest rate 1.00%    
Maximum [Member] | Note Payable, 6.24% | Subsidiaries      
Debt Instrument      
Stated interest rate 3.25%