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Loans Held for Investment - Schedule of Recorded Investment in Past Due Loans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process $ 0.5   $ 19.1
Nonaccrual loans 116.5   56.9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 17,377.3   17,844.9
Accrued interest reversal (1.5) $ (1.8)  
Financing Receivable, Excluding Accrued Interest, Nonaccrual 0.0 $ 0.0  
Financing Receivable, Nonaccrual, Interest Income 0.4    
30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Nonaccrual loans 14.8   13.5
60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Nonaccrual loans 28.3   6.2
Equal to or Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Nonaccrual loans 76.9   40.5
Commercial      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 29.9   7.7
Nonaccrual loans 82.9   55.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 9,196.1   9,263.2
Commercial | 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 1.4   4.9
Commercial | 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 28.5   2.8
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 0.0   0.0
Commercial | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 9,083.3   9,200.1
Total construction loans      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 3.6   3.7
Nonaccrual loans 4.0   3.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,097.3   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 3.6   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 1,089.7   1,237.6
Residential      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 11.8   9.7
Nonaccrual loans 16.6   15.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,161.4   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 10.7   6.6
Residential | 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 0.4   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 0.7   0.4
Residential | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 2,133.0   2,166.5
Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 17.2   10.4
Nonaccrual loans 20.5   5.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 678.1   701.1
Agricultural | 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 10.1   7.6
Agricultural | 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 7.0   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 0.1   0.0
Agricultural | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 640.4   685.4
Total real estate      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 62.5   31.5
Nonaccrual loans 124.0   79.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 13,132.9   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 25.8   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 35.9   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 0.8   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 12,946.4   13,289.6
Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 8.9   11.7
Nonaccrual loans 4.5   3.9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 680.2   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 7.2   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 1.6   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 0.1   0.7
Indirect consumer | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 666.8   709.4
Credit Card Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 1.8   2.2
Nonaccrual loans 0.0   0.0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 74.2   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 0.7   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 0.4   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 0.7   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 72.4   75.4
Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 11.4   15.0
Nonaccrual loans 5.1   4.5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 886.8   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 8.4   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 2.2   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 0.8   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 870.3   917.1
Commercial      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 7.0   14.8
Nonaccrual loans 31.3   33.5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,770.6   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 4.4   11.2
Commercial | 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 1.3   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 1.3   0.6
Commercial | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 2,732.3   2,781.1
Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 12.3   5.2
Nonaccrual loans 31.5   20.9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 595.8   687.9
Agricultural | 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 11.0   2.4
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 552.0   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 1.8   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 1.8   1.6
Loans And Leases Held For Investment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 93.2   66.5
Nonaccrual loans 191.9   138.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 17,387.9   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 49.6   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 40.6   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 3.0   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 17,102.8   17,651.2
Consumer Loan      
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]      
Financing Receivable, Loan in Process 0.7   1.1
Nonaccrual loans 0.6   0.6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 132.4   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 0.5   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 0.2   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 $ 131.1   $ 132.3