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Loans Held for Investment - Schedule of Contractual Aging of Loans by Portfolio (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process $ 0.0 $ 6.7  
Non-accrual Loans   27.3  
Loans and Leases Receivable, Collateral for Secured Borrowings 17,844.9 18,279.6  
Financing Receivable, Allowance for Credit Loss, Writeoff 114.7 35.9 $ 45.0
Financing Receivable, Nonaccrual, Interest Income (5.5)    
Financing Receivable, Accrued Interest, Writeoff (4.1) (2.7)  
Financing Receivable, Excluding Accrued Interest, Nonaccrual 0.0    
Collateral      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 56.9 33.3  
Loans and Leases Receivable, Collateral for Secured Borrowings 97.6 52.6  
Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 13.5 1.8  
Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 6.2 16.7  
Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 40.5 44.2  
Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 55.4 28.2  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1,368.4 1,337.6  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,369.8 2,085.9  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,946.9 1,675.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,397.5 1,215.4  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,084.8 774.1  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,901.0 1,706.1  
Financing Receivable, Excluding Accrued Interest, Revolving 75.2 47.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 119.6 28.1  
Financing Receivable, Allowance for Credit Loss, Writeoff 25.4 7.6 11.7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 9,263.2 8,869.2  
Commercial Real Estate Portfolio Segment [Member] | Collateral      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Collateral for Secured Borrowings 47.3 26.6  
Commercial Real Estate Portfolio Segment [Member] | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1,208.5 1,268.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,340.2 2,065.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,909.1 1,612.2  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,344.1 1,200.1  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,069.7 716.5  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,778.3 1,660.5  
Financing Receivable, Excluding Accrued Interest, Revolving 74.1 46.5  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 109.8 28.1  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 8,833.8 8,596.9  
Commercial Real Estate Portfolio Segment [Member] | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 81.5 65.4  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 12.1 11.8  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 22.0 18.9  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 37.3 2.4  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 10.2 30.1  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 43.5 28.5  
Financing Receivable, Excluding Accrued Interest, Revolving 0.5 0.2  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 207.1 157.3  
Commercial Real Estate Portfolio Segment [Member] | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 78.4 4.2  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 17.5 9.1  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 15.8 42.6  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 16.1 12.9  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 4.9 27.5  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 79.2 17.1  
Financing Receivable, Excluding Accrued Interest, Revolving 0.6 0.3  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 9.8 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 222.3 113.7  
Commercial Real Estate Portfolio Segment [Member] | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0 1.3  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0.0 1.3  
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 4.9 12.7  
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2.8 6.1  
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.0 0.0  
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 7.7 18.8  
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 9,200.1 8,822.2  
Commercial Real Estate Portfolio Segment [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.2 1.7  
Commercial Real Estate Portfolio Segment [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 5.7 0.3  
Commercial Real Estate Portfolio Segment [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 1.7  
Commercial Real Estate Portfolio Segment [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 19.4 2.6  
Commercial Real Estate Portfolio Segment [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Commercial Real Estate Portfolio Segment [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.1 1.3  
Commercial Real Estate Portfolio Segment [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Commercial Real Estate Portfolio Segment [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Land Acquisition And Development Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff     2.6
Residential Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff     0.0
Commercial Real Estate Construction [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff     6.6
Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 3.3 17.2  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 443.7 501.2  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 233.0 758.9  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 326.6 356.9  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 76.5 36.9  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 17.3 16.8  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 20.9 36.8  
Financing Receivable, Excluding Accrued Interest, Revolving 124.8 104.4  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 1.8 14.6  
Financing Receivable, Allowance for Credit Loss, Writeoff 13.2 10.3  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,244.6 1,826.5  
Real Estate Construction Financing Receivable [Member] | Collateral      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Collateral for Secured Borrowings 3.2 17.0  
Real Estate Construction Financing Receivable [Member] | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 438.0 493.7  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 233.0 735.3  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 320.2 331.2  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 76.5 36.7  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 17.3 16.8  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 20.9 36.2  
Financing Receivable, Excluding Accrued Interest, Revolving 124.8 104.4  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 1.8 13.7  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1,232.5 1,768.0  
Real Estate Construction Financing Receivable [Member] | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0 7.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0 4.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0 24.4  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0 0.2  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0 0.4  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0.0 36.0  
Real Estate Construction Financing Receivable [Member] | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 2.1 0.5  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0 6.6  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 6.4 1.3  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0 0.2  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.9  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 8.5 9.5  
Real Estate Construction Financing Receivable [Member] | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 3.6 0.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0 13.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 3.6 13.0  
Real Estate Construction Financing Receivable [Member] | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 3.7 3.1  
Real Estate Construction Financing Receivable [Member] | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.0 0.4  
Real Estate Construction Financing Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.0 0.0  
Real Estate Construction Financing Receivable [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 3.7 3.5  
Real Estate Construction Financing Receivable [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 1,237.6 1,805.8  
Real Estate Construction Financing Receivable [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Real Estate Construction Financing Receivable [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Real Estate Construction Financing Receivable [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 13.1 0.1  
Real Estate Construction Financing Receivable [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Real Estate Construction Financing Receivable [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.1 0.6  
Real Estate Construction Financing Receivable [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Real Estate Construction Financing Receivable [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Real Estate Construction Financing Receivable [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 9.6  
Residential Mortgage [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 15.4 10.7  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,191.6 2,244.3  
Residential Mortgage [Member] | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 6.6 11.9  
Residential Mortgage [Member] | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2.7 3.1  
Residential Mortgage [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.4 0.6  
Residential Mortgage [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 9.7 15.6  
Residential Mortgage [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2,166.5 2,218.0  
Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 5.3 5.4  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 132.6 96.9  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 61.4 154.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 131.2 133.3  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 117.4 98.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 78.9 58.6  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 145.7 136.7  
Financing Receivable, Excluding Accrued Interest, Revolving 33.4 32.3  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.5 7.0  
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0 0.2
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 701.1 716.8  
Agricultural Real Estate Financing Receivable [Member] | Collateral      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Collateral for Secured Borrowings 1.8 1.2  
Agricultural Real Estate Financing Receivable [Member] | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 118.6 86.2  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 53.0 123.7  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 104.7 126.2  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 107.9 93.5  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 66.0 56.7  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 144.1 124.3  
Financing Receivable, Excluding Accrued Interest, Revolving 33.4 31.8  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.5 7.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 628.2 649.4  
Agricultural Real Estate Financing Receivable [Member] | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 12.9 8.1  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 8.2 20.8  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 19.7 3.6  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 3.4 2.6  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 4.4 0.4  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.9 1.1  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 49.5 36.6  
Agricultural Real Estate Financing Receivable [Member] | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1.1 2.6  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.2 9.5  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 6.8 3.5  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 6.1 1.9  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 8.5 1.5  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.7 11.3  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.5  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 23.4 30.8  
Agricultural Real Estate Financing Receivable [Member] | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Revolving 0.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0.0    
Agricultural Real Estate Financing Receivable [Member] | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 7.6 1.8  
Agricultural Real Estate Financing Receivable [Member] | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2.8 0.0  
Agricultural Real Estate Financing Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.0 0.0  
Agricultural Real Estate Financing Receivable [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 10.4 1.8  
Agricultural Real Estate Financing Receivable [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 685.4 709.6  
Agricultural Real Estate Financing Receivable [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Real Estate Financing Receivable [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Real Estate Financing Receivable [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Real Estate Financing Receivable [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Real Estate Financing Receivable [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Real Estate Financing Receivable [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Real Estate Financing Receivable [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Real Estate Financing Receivable [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 79.4 61.5  
Financing Receivable, Allowance for Credit Loss, Writeoff 39.6 18.5 21.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 13,400.5 13,656.8  
Real Estate Financing Receivable [Member] | Collateral      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Collateral for Secured Borrowings 55.0 45.3  
Real Estate Financing Receivable [Member] | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 22.8 29.5  
Real Estate Financing Receivable [Member] | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 8.3 9.6  
Real Estate Financing Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.4 0.6  
Real Estate Financing Receivable [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 31.5 39.7  
Real Estate Financing Receivable [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 13,289.6 13,555.6  
Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 3.9 2.7  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 267.7 195.3  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 128.3 265.6  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 168.6 116.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 69.5 81.5  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 44.8 33.1  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 46.1 49.4  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Allowance for Credit Loss, Writeoff 8.5 7.3 4.0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 725.0 740.9  
Indirect consumer | Performing Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 266.8 194.9  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 127.2 264.7  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 167.5 115.4  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 68.9 81.1  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 44.4 32.9  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 45.6 48.8  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 720.4 737.8  
Indirect consumer | Nonperforming Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.9 0.4  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1.1 0.9  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1.1 0.6  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.6 0.4  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.4 0.2  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.5 0.6  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 4.6 3.1  
Indirect consumer | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 8.4 8.0  
Indirect consumer | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2.6 2.2  
Indirect consumer | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.7 0.4  
Indirect consumer | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 11.7 10.6  
Indirect consumer | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 709.4 727.6  
Indirect consumer | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.5 0.5  
Indirect consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 2.0 3.2  
Indirect consumer | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 3.4 1.8  
Indirect consumer | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 1.1 0.8  
Indirect consumer | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.4 0.3  
Indirect consumer | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 1.1 0.7  
Indirect consumer | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Indirect consumer | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 0.6 0.3  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 46.9 44.6  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 25.5 33.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 18.7 18.6  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 10.1 9.4  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 4.2 3.6  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 5.3 6.0  
Financing Receivable, Excluding Accrued Interest, Revolving 23.2 26.2  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.1 0.2  
Financing Receivable, Allowance for Credit Loss, Writeoff 3.9 4.1 3.7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 134.0 141.6  
Other consumer | Performing Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 46.5 44.5  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 25.4 32.9  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 18.5 18.5  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 10.0 9.4  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 4.2 3.6  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 5.2 6.0  
Financing Receivable, Excluding Accrued Interest, Revolving 23.2 26.2  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.1 0.2  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 133.1 141.3  
Other consumer | Nonperforming Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.4 0.1  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.1 0.1  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.2 0.1  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.1 0.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.1 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 0.9 0.3  
Other consumer | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.6 0.9  
Other consumer | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.2 0.2  
Other consumer | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.3 0.0  
Other consumer | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 1.1 1.1  
Other consumer | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 132.3 140.2  
Other consumer | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.2 0.2  
Other consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.6 0.5  
Other consumer | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.9 0.2  
Other consumer | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.2 0.4  
Other consumer | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.1  
Other consumer | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 1.8 2.6  
Other consumer | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.1 0.1  
Other consumer | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.1 0.0  
Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving 77.6 76.5  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Allowance for Credit Loss, Writeoff 3.0 2.6 2.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 77.6 76.5  
Credit card consumer | Performing Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving 76.6 75.9  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 76.6 75.9  
Credit card consumer | Nonperforming Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving 1.0 0.6  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1.0 0.6  
Credit card consumer | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.7 0.7  
Credit card consumer | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.5 0.5  
Credit card consumer | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 1.0 0.6  
Credit card consumer | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2.2 1.8  
Credit card consumer | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 75.4 74.7  
Credit card consumer | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Credit card consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Credit card consumer | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Credit card consumer | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Credit card consumer | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Credit card consumer | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Credit card consumer | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 3.0 2.6  
Credit card consumer | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 4.5 3.0  
Financing Receivable, Allowance for Credit Loss, Writeoff 15.4 14.0 10.1
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 936.6 959.0  
Total consumer loans | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 9.7 9.6  
Total consumer loans | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 3.3 2.9  
Total consumer loans | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2.0 1.0  
Total consumer loans | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 15.0 13.5  
Total consumer loans | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 917.1 942.5  
Commercial Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 33.5 11.5  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 473.5 508.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 373.9 533.3  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 392.9 407.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 324.2 225.2  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 173.7 111.2  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 259.2 277.9  
Financing Receivable, Excluding Accrued Interest, Revolving 821.6 836.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 10.4 8.2  
Financing Receivable, Allowance for Credit Loss, Writeoff 59.4 3.4 8.1
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,829.4 2,906.8  
Commercial Portfolio Segment [Member] | Collateral      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Collateral for Secured Borrowings 22.2 6.6  
Commercial Portfolio Segment [Member] | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 438.8 481.6  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 353.0 507.7  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 375.9 389.8  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 316.0 215.1  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 165.9 108.7  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 255.2 272.9  
Financing Receivable, Excluding Accrued Interest, Revolving 767.3 762.3  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 8.9 7.6  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,681.0 2,745.7  
Commercial Portfolio Segment [Member] | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 30.8 15.8  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 5.4 19.6  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 12.8 9.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 5.5 7.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1.6 1.6  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 3.4 3.0  
Financing Receivable, Excluding Accrued Interest, Revolving 35.2 58.8  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 1.5 0.4  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 96.2 115.2  
Commercial Portfolio Segment [Member] | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 3.9 7.3  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 13.9 4.7  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 3.1 6.6  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 2.2 3.1  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 6.2 0.9  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.6 1.9  
Financing Receivable, Excluding Accrued Interest, Revolving 19.1 14.8  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.2  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 49.0 39.5  
Commercial Portfolio Segment [Member] | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0 3.3  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1.6 1.3  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1.1 1.6  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.5 0.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0 0.1  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.1  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 3.2 6.4  
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 11.2 14.5  
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 3.0 1.1  
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.6 0.3  
Commercial Portfolio Segment [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 14.8 15.9  
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2,781.1 2,879.4  
Commercial Portfolio Segment [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 21.6 0.2  
Commercial Portfolio Segment [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 2.2 0.4  
Commercial Portfolio Segment [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 1.1 0.5  
Commercial Portfolio Segment [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.3 0.5  
Commercial Portfolio Segment [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.1 0.2  
Commercial Portfolio Segment [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.1 0.1  
Commercial Portfolio Segment [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 31.1 1.4  
Commercial Portfolio Segment [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 2.9 0.1  
Agricultural Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 20.9 30.4  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 136.7 152.1  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 61.4 58.8  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 40.4 34.8  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 16.8 23.3  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 14.9 35.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 5.9 9.5  
Financing Receivable, Excluding Accrued Interest, Revolving 410.4 449.4  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 1.4 6.5  
Financing Receivable, Allowance for Credit Loss, Writeoff 0.3 0.0 5.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 687.9 769.4  
Agricultural Financing Receivable [Member] | Collateral      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Collateral for Secured Borrowings 20.4 0.7  
Agricultural Financing Receivable [Member] | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 109.6 105.7  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 34.1 57.7  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 39.4 31.6  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 16.6 22.4  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 13.5 6.1  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 5.8 7.2  
Financing Receivable, Excluding Accrued Interest, Revolving 379.4 421.9  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 1.1 3.4  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 599.5 656.0  
Agricultural Financing Receivable [Member] | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 4.1 43.8  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 25.9 0.3  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.1 2.7  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0 0.7  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.5 28.8  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0 2.2  
Financing Receivable, Excluding Accrued Interest, Revolving 25.9 18.5  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.3 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 56.8 97.0  
Agricultural Financing Receivable [Member] | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 4.1 2.6  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1.4 0.8  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.9 0.5  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.2 0.2  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.9 0.1  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.1 0.1  
Financing Receivable, Excluding Accrued Interest, Revolving 5.1 9.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 3.1  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 12.7 16.4  
Agricultural Financing Receivable [Member] | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 18.9    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0    
Financing Receivable, Excluding Accrued Interest, Revolving 0.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 18.9    
Agricultural Financing Receivable [Member] | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2.4 0.1  
Agricultural Financing Receivable [Member] | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2.8 0.0  
Agricultural Financing Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.0 3.0  
Agricultural Financing Receivable [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 5.2 3.1  
Agricultural Financing Receivable [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 661.8 735.9  
Agricultural Financing Receivable [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Financing Receivable [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Financing Receivable [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Financing Receivable [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.3 0.0  
Agricultural Financing Receivable [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Financing Receivable [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Financing Receivable [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Agricultural Financing Receivable [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 1.6 0.1  
Other, including overdrafts | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.0 0.0  
Other, including overdrafts | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.0 0.0  
Other, including overdrafts | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0.0 0.0  
Other, including overdrafts | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
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      
Financing Receivable, Loan in Process 1.6 0.1  
Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 138.3 106.4  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 17,856.0 18,292.1  
Loans held for investment | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 46.1 53.7  
Loans held for investment | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 17.4 13.6  
Loans held for investment | Financing Receivables, Equal to Greater than 90 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 3.0 4.9  
Loans held for investment | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 66.5 72.2  
Loans held for investment | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 17,651.2 18,113.5  
Non Owner Occupied Loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff     3.5
Residential Real Estate 1-4 Family      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff     0.2
Residential Real Estate      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 23.9 45.8  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 75.3 359.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 414.0 522.5  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 489.4 501.7  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 441.3 89.2  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 257.4 222.2  
Financing Receivable, Excluding Accrued Interest, Revolving 477.8 471.8  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 12.5 32.1  
Financing Receivable, Allowance for Credit Loss, Writeoff 1.0 0.6 0.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,191.6 2,244.3  
Residential Real Estate | Collateral      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Collateral for Secured Borrowings 2.7 0.5  
Residential Real Estate | Performing Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 22.6 44.7  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 73.8 356.9  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 409.1 521.3  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 487.3 500.6  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 440.2 88.5  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 252.5 217.1  
Financing Receivable, Excluding Accrued Interest, Revolving 477.8 471.8  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 12.5 32.1  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 2,175.8 2,233.0  
Residential Real Estate | Nonperforming Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1.3 1.1  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1.5 2.1  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 4.9 1.2  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 2.1 1.1  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1.1 0.7  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 4.9 5.1  
Financing Receivable, Excluding Accrued Interest, Revolving 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0 0.0  
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process 15.8 11.3  
Residential Real Estate | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.3  
Residential Real Estate | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.2 0.0  
Residential Real Estate | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.2 0.1  
Residential Real Estate | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.1 0.1  
Residential Real Estate | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.3 0.0  
Residential Real Estate | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.2 0.1  
Residential Real Estate | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0 0.0  
Residential Real Estate | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff $ 0.0 $ 0.0  
Commercial Real Estate Owner Occupied      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff     2.5
Commercial Real Estate Multifamily      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff     5.7
Commercial and Floor Plans      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Allowance for Credit Loss, Writeoff     $ 6.6