v3.25.2
Loans Held for Investment - Schedule of Loans by Segment (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Deferred loan fees and costs $ (10.0)   $ (11.1)      
Allowance for credit losses (209.6) $ (215.3) (204.1) $ (232.8) $ (227.7) $ (227.7)
Net loans held for investment 16,143.8   17,640.8      
Financing Receivable, Loan in Process 0.0   1.2      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 16,353.4   17,844.9      
Nonaccrual loans 130.3   56.9      
30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Nonaccrual loans 29.5   13.5      
60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Nonaccrual loans 9.7   6.2      
Equal to or Greater than 90 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Nonaccrual loans 74.7   40.5      
Commercial real estate            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 5.4   7.7      
Nonaccrual loans 81.0   55.4      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 8,750.9   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 0.9   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 4.4   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 0.1   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 8,664.5   9,200.1      
Total construction loans            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 9.6   3.7      
Nonaccrual loans 4.0   3.3      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,004.6   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 9.3   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 0.3   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 991.0   1,237.6      
Residential            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 3.3   9.7      
Nonaccrual loans 16.1   15.4      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,157.5   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 1.8   6.6      
Residential | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 1.5   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 2,138.1   2,166.5      
Agricultural            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 6.4   10.4      
Nonaccrual loans 20.8   5.3      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 635.6   701.1      
Agricultural | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 5.1   7.6      
Agricultural | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 1.2   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 0.1   0.0      
Agricultural | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 608.4   685.4      
Total real estate            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Allowance for credit losses (148.7) (146.0) (139.4) (139.7) (152.9) (160.1)
Financing Receivable, Loan in Process 24.7   31.5      
Nonaccrual loans 121.9   79.4      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 12,548.6   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 17.1   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 7.4   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 0.2   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 12,402.0   13,289.6      
Indirect consumer            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 9.7   11.7      
Nonaccrual loans 3.9   3.9      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 607.1   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 7.0   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 2.1   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 0.6   0.7      
Indirect consumer | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 593.5   709.4      
Total consumer loans            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Allowance for credit losses (12.0) (15.9) (16.8) (18.5) (12.6) (13.0)
Financing Receivable, Loan in Process 10.9   15.0      
Nonaccrual loans 4.4   4.5      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 741.5   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 7.8   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 2.4   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 0.7   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 726.2   917.1      
Commercial            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Allowance for credit losses (42.9) (46.3) (38.9) (69.2) (58.0) (50.2)
Financing Receivable, Loan in Process 7.6   14.8      
Nonaccrual loans 44.4   33.5      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,529.9   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 3.9   11.2      
Commercial | 60 to 89 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 3.2   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 0.5   0.6      
Commercial | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 2,477.9   2,781.1      
Agricultural            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Allowance for credit losses (6.0) $ (7.1) (9.0) $ (5.4) $ (4.2) $ (4.4)
Financing Receivable, Loan in Process 10.4   5.2      
Nonaccrual loans 22.0   20.9      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 541.4   687.9      
Agricultural | 30 to 59 Days Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 10.4   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 509.0   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 2.0   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 2.0   1.6      
Loans And Leases Held For Investment [Member]            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 53.6   66.5      
Nonaccrual loans 192.7   138.3      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 16,363.4   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 39.2   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 13.0   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 1.4   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 16,117.1   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 0.5   0.6      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 134.4   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 0.8   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 0.3   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 0.1   0.3      
Consumer Loan | Financial Asset, Not Past Due            
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]            
Financing Receivable, Loan in Process 132.7   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