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Loans Held for Investment - Schedule of Loans by Segment (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Deferred loan fees and costs $ (9.5)   $ (11.1)      
Allowance for credit losses (205.8) $ (209.6) (204.1) $ (225.4) $ (232.8) $ (227.7)
Net loans held for investment 15,628.6   17,640.8      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 15,834.4   17,844.9      
Nonaccrual loans 101.0   56.9      
30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Nonaccrual loans 13.0   13.5      
60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Nonaccrual loans 5.5   6.2      
Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Nonaccrual loans 88.6   40.5      
Commercial real estate            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 5.2   7.7      
Nonaccrual loans 74.2   55.4      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 8,496.4   9,263.2      
Commercial real estate | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 5.0   4.9      
Commercial real estate | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.2   2.8      
Commercial real estate | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.0      
Commercial real estate | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 8,417.0   9,200.1      
Total construction loans            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.3   3.7      
Nonaccrual loans 4.2   3.3      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 960.8   1,244.6      
Total construction loans | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.3   3.7      
Total construction loans | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.0      
Total construction loans | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.0      
Total construction loans | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 956.3   1,237.6      
Residential            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 3.2   9.7      
Nonaccrual loans 16.1   15.4      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,136.0   2,191.6      
Residential | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 2.1   6.6      
Residential | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 1.1   2.7      
Residential | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.4      
Residential | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 2,116.7   2,166.5      
Agricultural            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 2.4   10.4      
Nonaccrual loans 26.9   5.3      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 623.0   701.1      
Agricultural | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 2.4   7.6      
Agricultural | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   2.8      
Agricultural | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.0      
Agricultural | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 593.7   685.4      
Total real estate            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Allowance for credit losses (151.1) (148.7) (139.4) (136.0) (139.7) (160.1)
Financing Receivable, Loan in Process 11.1   31.5      
Nonaccrual loans 121.4   79.4      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 12,216.2   13,400.5      
Total real estate | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 9.8   22.8      
Total real estate | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 1.3   8.3      
Total real estate | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.4      
Total real estate | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 12,083.7   13,289.6      
Indirect consumer            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 8.2   11.7      
Nonaccrual loans 4.8   3.9      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 540.3   725.0      
Indirect consumer | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 6.0   8.4      
Indirect consumer | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 2.2   2.6      
Indirect consumer | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.7      
Indirect consumer | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 527.3   709.4      
Total consumer loans            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Allowance for credit losses (12.3) (12.0) (16.8) (17.2) (18.5) (13.0)
Financing Receivable, Loan in Process 9.4   15.0      
Nonaccrual loans 5.4   4.5      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 674.6   936.6      
Total consumer loans | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 6.7   9.7      
Total consumer loans | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 2.7   3.3      
Total consumer loans | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   2.0      
Total consumer loans | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 659.8   917.1      
Commercial            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Allowance for credit losses (36.6) (42.9) (38.9) (66.8) (69.2) (50.2)
Financing Receivable, Loan in Process 7.5   14.8      
Nonaccrual loans 40.0   33.5      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,447.4   2,829.4      
Commercial | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 5.3   11.2      
Commercial | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 1.6   3.0      
Commercial | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.6   0.6      
Commercial | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 2,399.9   2,781.1      
Agricultural            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Allowance for credit losses (5.8) $ (6.0) (9.0) $ (5.4) $ (5.4) $ (4.4)
Financing Receivable, Loan in Process 1.1   5.2      
Nonaccrual loans 14.8   20.9      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 495.5   687.9      
Agricultural | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 1.1   2.4      
Agricultural | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   2.8      
Agricultural | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.0      
Agricultural | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 479.6   661.8      
Other, including overdrafts            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.0      
Nonaccrual loans 0.0   0.0      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 10.2   1.6      
Other, including overdrafts | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.0      
Other, including overdrafts | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.0      
Other, including overdrafts | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.0      
Other, including overdrafts | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 10.2   1.6      
Loans And Leases Held For Investment [Member]            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 29.1   66.5      
Nonaccrual loans 181.6   138.3      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 15,843.9   17,856.0      
Loans And Leases Held For Investment [Member] | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 22.9   46.1      
Loans And Leases Held For Investment [Member] | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 5.6   17.4      
Loans And Leases Held For Investment [Member] | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.6   3.0      
Loans And Leases Held For Investment [Member] | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 15,633.2   17,651.2      
Consumer Loan            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 1.2   1.1      
Nonaccrual loans 0.6   0.6      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 134.3   134.0      
Consumer Loan | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.7   0.6      
Consumer Loan | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.5   0.2      
Consumer Loan | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.3      
Consumer Loan | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 132.5   132.3      
Credit Card Receivable [Member]            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   2.2      
Nonaccrual loans 0.0   0.0      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0.0   77.6      
Credit Card Receivable [Member] | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.7      
Credit Card Receivable [Member] | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   0.5      
Credit Card Receivable [Member] | Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 0.0   1.0      
Credit Card Receivable [Member] | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process $ 0.0   $ 75.4