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Loans Held for Investment - Schedule of Recorded Investment in Impaired Loans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense $ (15.2) $ (61.3)    
Accounts Receivable, Allowance for Credit Loss 226.1 247.2 $ 220.1 $ 122.3
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) 12.2 57.3    
Impaired Financing Receivable, Interest Income, Accrual Method 0.0 0.0    
Total real estate loans        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense (13.4) (38.5)    
Accounts Receivable, Allowance for Credit Loss 147.5 169.6 138.7 69.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 13,534.6   13,456.2  
Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense 0.8 (19.1)    
Accounts Receivable, Allowance for Credit Loss 54.4 58.2 54.9 31.6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 3,028.0   2,882.6  
Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense 1.1 0.5    
Accounts Receivable, Allowance for Credit Loss 2.4 (1.0) 3.2 0.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 660.4   708.3  
Non-owner occupied        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense (1.3) (6.7)    
Accounts Receivable, Allowance for Credit Loss 26.0 45.2 27.2 17.3
Owner occupied        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense 0.2 (4.6)    
Accounts Receivable, Allowance for Credit Loss 17.6 25.2 19.5 13.3
Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense (8.2) (22.7)    
Accounts Receivable, Allowance for Credit Loss 78.6 125.0 74.6 43.9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 8,680.8   8,528.6  
Residential construction        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense (0.1) (0.9)    
Accounts Receivable, Allowance for Credit Loss 3.7 3.3 3.6 2.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 471.4   516.2  
Commercial construction        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense (5.9) (4.0)    
Accounts Receivable, Allowance for Credit Loss 37.1 10.2 31.2 6.0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,053.1   1,042.0  
Total construction        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense (6.3) (4.1)    
Accounts Receivable, Allowance for Credit Loss 42.4 14.0 36.1 8.9
Residential 1-4 family        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense 0.2 (5.2)    
Accounts Receivable, Allowance for Credit Loss 20.2 18.7 20.5 13.4
Residential        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense (0.1) (5.3)    
Accounts Receivable, Allowance for Credit Loss 21.7 20.1 22.1 14.6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,191.1   2,188.3  
Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense 1.2 (6.4)    
Accounts Receivable, Allowance for Credit Loss 4.8 $ 10.5 5.9 $ 1.9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 769.7   794.9  
Collateral [Member]        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 59.5   39.1  
Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 7.5   4.6  
Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2.6   7.3  
Collateral [Member] | Non-owner occupied        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 13.8   4.4  
Collateral [Member] | Owner occupied        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 12.1   13.0  
Collateral [Member] | Residential construction        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 17.9   3.2  
Collateral [Member] | Commercial construction        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.5      
Collateral [Member] | Residential 1-4 family        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.5   0.5  
Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 4.6   6.1  
Business Assets [Member] | Collateral [Member]        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 9.1   7.1  
Business Assets [Member] | Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 5.4   3.1  
Business Assets [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2.1   2.1  
Business Assets [Member] | Collateral [Member] | Non-owner occupied        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1.6   1.7  
Business Assets [Member] | Collateral [Member] | Owner occupied        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Business Assets [Member] | Collateral [Member] | Residential construction        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Business Assets [Member] | Collateral [Member] | Commercial construction        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0      
Business Assets [Member] | Collateral [Member] | Residential 1-4 family        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Business Assets [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.2  
Real Property [Member] | Collateral [Member]        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 50.4   32.0  
Real Property [Member] | Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2.1   1.5  
Real Property [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.5   5.2  
Real Property [Member] | Collateral [Member] | Non-owner occupied        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 12.2   2.7  
Real Property [Member] | Collateral [Member] | Owner occupied        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 12.1   13.0  
Real Property [Member] | Collateral [Member] | Residential construction        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 17.9   3.2  
Real Property [Member] | Collateral [Member] | Commercial construction        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.5      
Real Property [Member] | Collateral [Member] | Residential 1-4 family        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.5   0.5  
Real Property [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss $ 4.6   $ 5.9