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Long-Term Debt and Other Borrowed Funds (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
May 31, 2020
Debt Instrument      
Stated interest rate 4.77% 5.52% 5.25%
Long-term debt and capital lease obligations $ 132.2 $ 120.8  
Fiscal Year Maturities of Long-term Debt      
2018 0.1    
2019 0.1    
2020 0.2    
2021 0.2    
2022 4.1    
Thereafter 127.5    
Long-term debt and capital lease obligations 132.2 120.8  
Other borrowings 1,567.5 2,603.0  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 0.9    
Other Borrowings $ 0.0    
FIB      
Fiscal Year Maturities of Long-term Debt      
Ownership percentage in subsidiary 99.90%    
Parent Company      
Debt Instrument      
Long-term debt $ 99.1 99.0  
Parent      
Debt Instrument      
Long-term debt $ 99.1 $ 99.0  
4.48% fixed rate borrowings in tenors up to one-month      
Debt Instrument      
Stated interest rate   5.52%  
Average fixed rate borrowings in tenors of up to 12-months      
Debt Instrument      
Stated interest rate 4.78%    
Fiscal Year Maturities of Long-term Debt      
Other borrowings $ 1,317.5    
Average fixed rate borrowings in tenors over 12-months      
Debt Instrument      
Stated interest rate 4.72%    
Fiscal Year Maturities of Long-term Debt      
Other borrowings $ 250.0    
Average fixed rate borrowings in tenors of 3-months      
Fiscal Year Maturities of Long-term Debt      
Other borrowings   $ 2,603.0  
Capital lease obligations | Capital Lease Obligation, 8.00% | Subsidiaries      
Debt Instrument      
Stated interest rate 8.00%    
Finance Lease, Liability $ 0.8 0.9  
Notes payable | Subsidiaries      
Fiscal Year Maturities of Long-term Debt      
Long Term Debt, Acquired or Assumed 28.4 20.9  
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, One Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 1.00%    
Notes payable | Note Payable, 1.00% | Subsidiaries      
Debt Instrument      
Long-term debt $ 0.0 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%    
Notes payable | Note Payable, 1.12%, Maturing December 31, 2045 | Subsidiaries      
Debt Instrument      
Long-term debt $ 6.8 6.8  
Notes payable | Note Payable, 1.35%, Maturing December 31, 2046 | Subsidiaries      
Debt Instrument      
Long-term debt $ 6.4 6.4  
Notes payable | Note Payable, One Point One Two Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 1.12%    
Notes payable | Note Payable, One Point Three Five Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 1.35%    
Notes payable | Note Payable, 1.26%, Maturing December 31, 2051 | Subsidiaries      
Debt Instrument      
Long-term debt $ 12.6 0.0  
Notes payable | FHLB Borrowing maturing August 2025 | Subsidiaries      
Debt Instrument      
Stated interest rate 0.00%    
Long-term debt $ 3.9 $ 0.0  
Notes payable | Note Payable, One Point Two Six Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 1.26%    
Federal Home Loan Bank | Notes Payable to FHLB | Subsidiaries      
Fiscal Year Maturities of Long-term Debt      
FHLB, advances, maximum amount available $ 5,942.8    
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds 4,371.4    
Secured Debt      
Fiscal Year Maturities of Long-term Debt      
Line of credit facility, maximum borrowing capacity 1,813.6    
Federal Funds Purchased      
Fiscal Year Maturities of Long-term Debt      
Line of credit facility, maximum borrowing capacity 235.0    
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, 1.00% | Subsidiaries      
Debt Instrument      
Stated interest rate 1.00%    
Maximum [Member] | Note Payable, Three Point Two Five Percent | Subsidiaries      
Debt Instrument      
Stated interest rate 3.25%