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Loans Held for Investment - Schedule of Contractual Aging of Loans by Portfolio (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process $ 6,700,000    
Non-accrual Loans 27,300,000 $ 39,800,000  
Loans and Leases Receivable, Nonperforming, Accrual of Interest 0    
Impaired Financing Receivable, Interest Income, Accrual Method 0    
Less loans charged-off 35,900,000 45,000,000.0 $ 16,600,000
Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 28,200,000 19,600,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 8,869,200,000 8,528,600,000  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1,337,600,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,085,900,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,675,000,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,215,400,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 774,100,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,706,100,000    
Financing Receivable, Excluding Accrued Interest, Revolving 47,000,000.0    
Loans and Leases Receivable, Allowance 8,869,200,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 28,100,000    
Less loans charged-off 7,600,000 11,700,000 2,300,000
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 1,268,000,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,065,000,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,612,200,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,200,100,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 716,500,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,660,500,000    
Financing Receivable, Excluding Accrued Interest, Revolving 46,500,000    
Loans and Leases Receivable, Allowance 8,596,900,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 28,100,000    
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 65,400,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 11,800,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 18,900,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 2,400,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 30,100,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 28,500,000    
Financing Receivable, Excluding Accrued Interest, Revolving 200,000    
Loans and Leases Receivable, Allowance 157,300,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
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 4,200,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 9,100,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 42,600,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 12,900,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 27,500,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 17,100,000    
Financing Receivable, Excluding Accrued Interest, Revolving 300,000    
Loans and Leases Receivable, Allowance 113,700,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
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    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,300,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Revolving 0    
Loans and Leases Receivable, Allowance 1,300,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
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 12,700,000 5,600,000  
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 6,100,000 800,000  
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 1,100,000  
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 18,800,000 7,500,000  
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 8,822,200,000 8,501,500,000  
Commercial Real Estate Portfolio Segment [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 1,700,000    
Commercial Real Estate Portfolio Segment [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 300,000    
Commercial Real Estate Portfolio Segment [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 1,700,000    
Commercial Real Estate Portfolio Segment [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 2,600,000    
Commercial Real Estate Portfolio Segment [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Commercial Real Estate Portfolio Segment [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 1,300,000    
Commercial Real Estate Portfolio Segment [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Commercial Real Estate Portfolio Segment [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Land Acquisition And Development Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   159,200,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   117,900,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   29,700,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   17,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   11,100,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   29,100,000  
Financing Receivable, Excluding Accrued Interest, Revolving   22,200,000  
Loans and Leases Receivable, Allowance   386,200,000  
Less loans charged-off   2,600,000 1,200,000
Land Acquisition And Development Construction Financing Receivable [Member] | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   152,500,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   114,400,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   29,500,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   17,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   10,900,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   28,400,000  
Financing Receivable, Excluding Accrued Interest, Revolving   22,200,000  
Loans and Leases Receivable, Allowance   374,900,000  
Land Acquisition And Development 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  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   300,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   200,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   400,000  
Financing Receivable, Excluding Accrued Interest, Revolving   0  
Loans and Leases Receivable, Allowance   900,000  
Land Acquisition And Development 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   6,700,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   200,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   300,000  
Financing Receivable, Excluding Accrued Interest, Revolving   0  
Loans and Leases Receivable, Allowance   7,200,000  
Land Acquisition And Development Construction Financing Receivable [Member] | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Allowance   3,200,000  
Financing Receivable, Originated in Current Fiscal Year   0  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year   3,200,000  
Financing Receivable, Originated Two Years before Latest Fiscal Year   0  
Financing Receivable, Originated Three Years before Latest Fiscal Year   0  
Financing Receivable, Originated Four Years before Latest Fiscal Year   0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year   0  
Financing Receivable, Revolving   0  
Residential Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   118,400,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   120,400,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   400,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   300,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   400,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   6,200,000  
Financing Receivable, Excluding Accrued Interest, Revolving   270,100,000  
Loans and Leases Receivable, Allowance   516,200,000  
Less loans charged-off   0 100,000
Residential 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   118,400,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   119,900,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   400,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   300,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   400,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   5,800,000  
Financing Receivable, Excluding Accrued Interest, Revolving   270,100,000  
Loans and Leases Receivable, Allowance   515,300,000  
Residential 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  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   500,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   400,000  
Financing Receivable, Excluding Accrued Interest, Revolving   0  
Loans and Leases Receivable, Allowance   900,000  
Commercial Real Estate Construction [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   461,800,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   399,200,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   112,800,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   45,900,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   400,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Revolving   21,900,000  
Loans and Leases Receivable, Allowance   1,042,000,000  
Less loans charged-off   6,600,000 100,000
Commercial Real Estate Construction [Member] | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   442,700,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   374,800,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   89,700,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   45,900,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   400,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Revolving   10,600,000  
Loans and Leases Receivable, Allowance   964,100,000  
Commercial Real Estate Construction [Member] | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Allowance   41,200,000  
Financing Receivable, Originated in Current Fiscal Year   16,800,000  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year   24,400,000  
Financing Receivable, Originated Two Years before Latest Fiscal Year   0  
Financing Receivable, Originated Three Years before Latest Fiscal Year   0  
Financing Receivable, Originated Four Years before Latest Fiscal Year   0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year   0  
Financing Receivable, Revolving   0  
Commercial Real Estate Construction [Member] | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Allowance   36,700,000  
Financing Receivable, Originated in Current Fiscal Year   2,300,000  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year   0  
Financing Receivable, Originated Two Years before Latest Fiscal Year   23,100,000  
Financing Receivable, Originated Three Years before Latest Fiscal Year   0  
Financing Receivable, Originated Four Years before Latest Fiscal Year   0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year   0  
Financing Receivable, Revolving   11,300,000  
Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 17,200,000 3,700,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 1,826,500,000 1,944,400,000  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 501,200,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 758,900,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 356,900,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 36,900,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 16,800,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 36,800,000    
Financing Receivable, Excluding Accrued Interest, Revolving 104,400,000    
Loans and Leases Receivable, Allowance 1,826,500,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 14,600,000    
Less loans charged-off 10,300,000    
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 493,700,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 735,300,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 331,200,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 36,700,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 16,800,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 36,200,000    
Financing Receivable, Excluding Accrued Interest, Revolving 104,400,000    
Loans and Leases Receivable, Allowance 1,768,000,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 13,700,000    
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 7,000,000.0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 4,000,000.0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 24,400,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 200,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 400,000    
Financing Receivable, Excluding Accrued Interest, Revolving 0    
Loans and Leases Receivable, Allowance 36,000,000.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 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 500,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 6,600,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,300,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 200,000    
Financing Receivable, Excluding Accrued Interest, Revolving 0    
Loans and Leases Receivable, Allowance 9,500,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 900,000    
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 0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 13,000,000.0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Revolving 0    
Loans and Leases Receivable, Allowance 13,000,000.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 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 3,100,000 10,400,000  
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 400,000 600,000  
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 0 600,000  
Real Estate Construction Financing Receivable [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 3,500,000 11,600,000  
Real Estate Construction Financing Receivable [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 1,805,800,000 1,929,100,000  
Real Estate Construction Financing Receivable [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Real Estate Construction Financing Receivable [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Real Estate Construction Financing Receivable [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 100,000    
Real Estate Construction Financing Receivable [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Real Estate Construction Financing Receivable [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 600,000    
Real Estate Construction Financing Receivable [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Real Estate Construction Financing Receivable [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Real Estate Construction Financing Receivable [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 9,600,000    
Residential Mortgage [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 10,700,000 6,400,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 2,244,300,000 2,188,300,000  
Residential Mortgage [Member] | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 11,900,000 9,900,000  
Residential Mortgage [Member] | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 3,100,000 2,100,000  
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 600,000 1,200,000  
Residential Mortgage [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 15,600,000 13,200,000  
Residential Mortgage [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2,218,000,000 2,168,700,000  
Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 5,400,000 7,600,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 716,800,000 794,900,000  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 96,900,000 204,200,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 154,000,000.0 185,800,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 133,300,000 115,500,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 98,000,000.0 68,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 58,600,000 59,300,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 136,700,000 119,600,000  
Financing Receivable, Excluding Accrued Interest, Revolving 32,300,000 42,500,000  
Loans and Leases Receivable, Allowance 716,800,000 794,900,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 7,000,000.0    
Less loans charged-off 0 200,000 700,000
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 86,200,000 180,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 123,700,000 172,800,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 126,200,000 109,500,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 93,500,000 64,800,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 56,700,000 46,600,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 124,300,000 105,100,000  
Financing Receivable, Excluding Accrued Interest, Revolving 31,800,000 31,400,000  
Loans and Leases Receivable, Allowance 649,400,000 710,200,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 7,000,000.0    
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 8,100,000 1,800,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 20,800,000 12,300,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 3,600,000 3,500,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 2,600,000 600,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 400,000 2,700,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,100,000 11,300,000  
Financing Receivable, Excluding Accrued Interest, Revolving 0 100,000  
Loans and Leases Receivable, Allowance 36,600,000 32,300,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
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 2,600,000 22,400,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 9,500,000 700,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 3,500,000 1,200,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,900,000 2,600,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,500,000 10,000,000.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 11,300,000 3,200,000  
Financing Receivable, Excluding Accrued Interest, Revolving 500,000 11,000,000.0  
Loans and Leases Receivable, Allowance 30,800,000 51,100,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
Agricultural Real Estate Financing Receivable [Member] | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Allowance   1,300,000  
Financing Receivable, Originated in Current Fiscal Year   0  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year   0  
Financing Receivable, Originated Two Years before Latest Fiscal Year   1,300,000  
Financing Receivable, Originated Three Years before Latest Fiscal Year   0  
Financing Receivable, Originated Four Years before Latest Fiscal Year   0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year   0  
Financing Receivable, Revolving   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 1,800,000 1,100,000  
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 0 6,100,000  
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  
Agricultural Real Estate Financing Receivable [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 1,800,000 7,200,000  
Agricultural Real Estate Financing Receivable [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 709,600,000 780,100,000  
Agricultural Real Estate Financing Receivable [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Real Estate Financing Receivable [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Real Estate Financing Receivable [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Real Estate Financing Receivable [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Real Estate Financing Receivable [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Real Estate Financing Receivable [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Real Estate Financing Receivable [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Real Estate Financing Receivable [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 61,500,000 37,300,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 13,656,800,000 13,456,200,000  
Less loans charged-off 18,500,000 21,400,000 4,500,000
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 29,500,000 27,000,000.0  
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 9,600,000 9,600,000  
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 600,000 2,900,000  
Real Estate Financing Receivable [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 39,700,000 39,500,000  
Real Estate Financing Receivable [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 13,555,600,000 13,379,400,000  
Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 2,700,000 2,700,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 740,900,000 829,700,000  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 195,300,000 381,300,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 265,600,000 177,300,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 116,000,000.0 130,600,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 81,500,000 60,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 33,100,000 33,800,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 49,400,000 46,700,000  
Financing Receivable, Excluding Accrued Interest, Revolving 0 0  
Loans and Leases Receivable, Allowance 740,900,000 829,700,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
Less loans charged-off 7,300,000 4,000,000.0 3,500,000
Indirect consumer | Performing Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 194,900,000 380,300,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 264,700,000 176,400,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 115,400,000 130,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 81,100,000 59,700,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 32,900,000 33,600,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 48,800,000 46,300,000  
Financing Receivable, Excluding Accrued Interest, Revolving 0 0  
Loans and Leases Receivable, Allowance 737,800,000 826,300,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
Indirect consumer | Nonperforming Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 400,000 1,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 900,000 900,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 600,000 600,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 400,000 300,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 200,000 200,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 600,000 400,000  
Financing Receivable, Excluding Accrued Interest, Revolving 0 0  
Loans and Leases Receivable, Allowance 3,100,000 3,400,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
Indirect consumer | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 8,000,000.0 9,300,000  
Indirect consumer | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2,200,000 2,400,000  
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 400,000 600,000  
Indirect consumer | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 10,600,000 12,300,000  
Indirect consumer | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 727,600,000 814,700,000  
Indirect consumer | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 500,000    
Indirect consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 3,200,000    
Indirect consumer | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 1,800,000    
Indirect consumer | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 800,000    
Indirect consumer | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 300,000    
Indirect consumer | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 700,000    
Indirect consumer | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Indirect consumer | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 300,000 300,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 141,600,000 152,900,000  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 44,600,000 52,700,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 33,000,000.0 32,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 18,600,000 18,300,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 9,400,000 8,500,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 3,600,000 6,500,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 6,000,000.0 9,000,000.0  
Financing Receivable, Excluding Accrued Interest, Revolving 26,200,000 25,900,000  
Loans and Leases Receivable, Allowance 141,600,000 152,900,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 200,000    
Less loans charged-off 4,100,000 3,700,000 2,900,000
Other consumer | Performing Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 44,500,000 52,600,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 32,900,000 31,900,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 18,500,000 18,200,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 9,400,000 8,500,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 3,600,000 6,500,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 6,000,000.0 8,900,000  
Financing Receivable, Excluding Accrued Interest, Revolving 26,200,000 25,800,000  
Loans and Leases Receivable, Allowance 141,300,000 152,400,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 200,000    
Other consumer | Nonperforming Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 100,000 100,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 100,000 100,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 100,000 100,000  
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 0 100,000  
Financing Receivable, Excluding Accrued Interest, Revolving 0 100,000  
Loans and Leases Receivable, Allowance 300,000 500,000  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
Other consumer | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 900,000 800,000  
Other consumer | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 200,000 300,000  
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 0 100,000  
Other consumer | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 1,100,000 1,200,000  
Other consumer | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 140,200,000 151,400,000  
Other consumer | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 200,000    
Other consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 500,000    
Other consumer | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 200,000    
Other consumer | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 400,000    
Other consumer | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 100,000    
Other consumer | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 2,600,000    
Other consumer | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 100,000    
Other consumer | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 0 0  
Loans and Leases Receivable, Collateral for Secured Borrowings 76,500,000 75,900,000  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0 178,100,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Revolving 76,500,000    
Loans and Leases Receivable, Allowance 76,500,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
Less loans charged-off 2,600,000 2,400,000 1,800,000
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 0 177,300,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Revolving 75,900,000    
Loans and Leases Receivable, Allowance 75,900,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
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 0 800,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Revolving 600,000    
Loans and Leases Receivable, Allowance 600,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
Credit card consumer | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 700,000 800,000  
Credit card consumer | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 500,000 400,000  
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 600,000 600,000  
Credit card consumer | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 1,800,000 1,800,000  
Credit card consumer | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 74,700,000 74,100,000  
Credit card consumer | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Credit card consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Credit card consumer | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Credit card consumer | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Credit card consumer | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Credit card consumer | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Credit card consumer | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 2,600,000    
Credit card consumer | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 3,000,000.0 3,000,000.0  
Loans and Leases Receivable, Collateral for Secured Borrowings 959,000,000.0 1,058,500,000  
Less loans charged-off 14,000,000.0 10,100,000 8,200,000
Total consumer loans | Financing Receivables, 30 to 59 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 9,600,000 10,900,000  
Total consumer loans | Financing Receivables, 60 to 89 Days Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2,900,000 3,100,000  
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 1,000,000.0 1,300,000  
Total consumer loans | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 13,500,000 15,300,000  
Total consumer loans | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 942,500,000 1,040,200,000  
Commercial Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 11,500,000 10,200,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 2,906,800,000 2,882,600,000  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 508,000,000.0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 533,300,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 407,000,000.0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 225,200,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 111,200,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 277,900,000    
Financing Receivable, Excluding Accrued Interest, Revolving 836,000,000.0    
Loans and Leases Receivable, Allowance 2,906,800,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 8,200,000    
Less loans charged-off 3,400,000 8,100,000 3,700,000
Commercial Portfolio Segment [Member] | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 481,600,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 507,700,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 389,800,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 215,100,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 108,700,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 272,900,000    
Financing Receivable, Excluding Accrued Interest, Revolving 762,300,000    
Loans and Leases Receivable, Allowance 2,745,700,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 7,600,000    
Commercial Portfolio Segment [Member] | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 15,800,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 19,600,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 9,000,000.0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 7,000,000.0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,600,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 3,000,000.0    
Financing Receivable, Excluding Accrued Interest, Revolving 58,800,000    
Loans and Leases Receivable, Allowance 115,200,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 400,000    
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 7,300,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 4,700,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 6,600,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 3,100,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 900,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,900,000    
Financing Receivable, Excluding Accrued Interest, Revolving 14,800,000    
Loans and Leases Receivable, Allowance 39,500,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 200,000    
Commercial Portfolio Segment [Member] | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 3,300,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,300,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,600,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 100,000    
Financing Receivable, Excluding Accrued Interest, Revolving 100,000    
Loans and Leases Receivable, Allowance 6,400,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
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 14,500,000 7,100,000  
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 1,100,000 1,700,000  
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 300,000 2,100,000  
Commercial Portfolio Segment [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 15,900,000 10,900,000  
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 2,879,400,000 2,861,500,000  
Commercial Portfolio Segment [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 200,000    
Commercial Portfolio Segment [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 400,000    
Commercial Portfolio Segment [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 500,000    
Commercial Portfolio Segment [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 500,000    
Commercial Portfolio Segment [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 200,000    
Commercial Portfolio Segment [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 100,000    
Commercial Portfolio Segment [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 1,400,000    
Commercial Portfolio Segment [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 100,000    
Agricultural Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 30,400,000 8,700,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 769,400,000 708,300,000  
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 152,100,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 58,800,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 34,800,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 23,300,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 35,000,000.0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 9,500,000    
Financing Receivable, Excluding Accrued Interest, Revolving 449,400,000    
Loans and Leases Receivable, Allowance 769,400,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 6,500,000    
Less loans charged-off 0 5,400,000 200,000
Agricultural Financing Receivable [Member] | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 105,700,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 57,700,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 31,600,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 22,400,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 6,100,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 7,200,000    
Financing Receivable, Excluding Accrued Interest, Revolving 421,900,000    
Loans and Leases Receivable, Allowance 656,000,000.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 3,400,000    
Agricultural Financing Receivable [Member] | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 43,800,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 300,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 2,700,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 700,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 28,800,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 2,200,000    
Financing Receivable, Excluding Accrued Interest, Revolving 18,500,000    
Loans and Leases Receivable, Allowance 97,000,000.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 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 2,600,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 800,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 500,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 200,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 100,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 100,000    
Financing Receivable, Excluding Accrued Interest, Revolving 9,000,000.0    
Loans and Leases Receivable, Allowance 16,400,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 3,100,000    
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 100,000 800,000  
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 0 2,200,000  
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 3,000,000.0 100,000  
Agricultural Financing Receivable [Member] | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 3,100,000 3,100,000  
Agricultural Financing Receivable [Member] | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 735,900,000 696,500,000  
Agricultural Financing Receivable [Member] | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Financing Receivable [Member] | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Financing Receivable [Member] | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Financing Receivable [Member] | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Financing Receivable [Member] | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Financing Receivable [Member] | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Financing Receivable [Member] | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Agricultural Financing Receivable [Member] | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 0 0  
Loans and Leases Receivable, Collateral for Secured Borrowings 100,000 9,200,000  
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  
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  
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  
Other, including overdrafts | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 0 0  
Other, including overdrafts | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 100,000 9,200,000  
Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Non-accrual Loans 106,400,000 59,200,000  
Loans and Leases Receivable, Collateral for Secured Borrowings 18,292,100,000 18,114,800,000  
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 53,700,000 45,800,000  
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 13,600,000 16,600,000  
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 4,900,000 6,400,000  
Loans held for investment | Financial Asset, Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 72,200,000 68,800,000  
Loans held for investment | Financial Asset, Not Past Due      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Loan in Process 18,113,500,000 17,986,800,000  
Non Owner Occupied Loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   1,163,700,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   882,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   674,200,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   490,400,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   261,100,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   907,600,000  
Financing Receivable, Excluding Accrued Interest, Revolving   29,200,000  
Loans and Leases Receivable, Allowance   4,408,200,000  
Less loans charged-off   3,500,000 0
Non Owner Occupied Loans | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   1,162,600,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   861,300,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   661,100,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   467,600,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   241,500,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   890,400,000  
Financing Receivable, Excluding Accrued Interest, Revolving   29,200,000  
Loans and Leases Receivable, Allowance   4,313,700,000  
Non Owner Occupied Loans | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   100,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   13,900,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   10,800,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   18,200,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   19,600,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   9,800,000  
Financing Receivable, Excluding Accrued Interest, Revolving   0  
Loans and Leases Receivable, Allowance   72,400,000  
Non Owner Occupied Loans | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   1,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   6,800,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   2,300,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   4,600,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   7,400,000  
Financing Receivable, Excluding Accrued Interest, Revolving   0  
Loans and Leases Receivable, Allowance   22,100,000  
Residential Real Estate 1-4 Family      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   258,900,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   490,500,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   541,700,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   98,500,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   32,300,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   217,500,000  
Financing Receivable, Excluding Accrued Interest, Revolving   0  
Loans and Leases Receivable, Allowance   1,639,400,000  
Less loans charged-off   200,000 0
Residential Real Estate 1-4 Family | Performing Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   258,900,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   490,300,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   541,600,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   98,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   32,000,000.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   213,800,000  
Financing Receivable, Excluding Accrued Interest, Revolving   0  
Loans and Leases Receivable, Allowance   1,634,600,000  
Residential Real Estate 1-4 Family | Nonperforming Financial Instruments      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   200,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   100,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   500,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   300,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   3,700,000  
Financing Receivable, Excluding Accrued Interest, Revolving   0  
Loans and Leases Receivable, Allowance   4,800,000  
Residential Real Estate      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 45,800,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 359,000,000.0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 522,500,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 501,700,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 89,200,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 222,200,000    
Financing Receivable, Excluding Accrued Interest, Revolving 471,800,000    
Loans and Leases Receivable, Allowance 2,244,300,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 32,100,000    
Less loans charged-off 600,000 300,000 100,000
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 44,700,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 356,900,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 521,300,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 500,600,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 88,500,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 217,100,000    
Financing Receivable, Excluding Accrued Interest, Revolving 471,800,000    
Loans and Leases Receivable, Allowance 2,233,000,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 32,100,000    
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 1,100,000    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,100,000    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,200,000    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,100,000    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 700,000    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 5,100,000    
Financing Receivable, Excluding Accrued Interest, Revolving 0    
Loans and Leases Receivable, Allowance 11,300,000    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0    
Residential Real Estate | Year One, Originated, Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 300,000    
Residential Real Estate | Year Two, Originated, Fiscal Year Before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Residential Real Estate | Year Three, Originated, Two Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 100,000    
Residential Real Estate | Year Four, Originated, Three Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 100,000    
Residential Real Estate | Year Five, Originated, Four Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Residential Real Estate | Originated, More than Five Years before Current Fiscal Year      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 100,000    
Residential Real Estate | Revolving      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off 0    
Residential Real Estate | Revolving, Converted to Term      
Loans and Leases Receivable Recorded Investment, Past Due      
Less loans charged-off $ 0    
Commercial Real Estate Owner Occupied      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   812,700,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   737,300,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   548,500,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   281,300,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   179,900,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   574,000,000.0  
Financing Receivable, Excluding Accrued Interest, Revolving   19,800,000  
Loans and Leases Receivable, Allowance   3,153,500,000  
Less loans charged-off   2,500,000 2,300,000
Commercial Real Estate Owner Occupied | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   793,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   718,700,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   533,900,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   266,300,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   165,800,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   551,300,000  
Financing Receivable, Excluding Accrued Interest, Revolving   18,200,000  
Loans and Leases Receivable, Allowance   3,047,200,000  
Commercial Real Estate Owner Occupied | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   8,400,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   3,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   2,300,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   8,900,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   8,500,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   17,200,000  
Financing Receivable, Excluding Accrued Interest, Revolving   500,000  
Loans and Leases Receivable, Allowance   48,800,000  
Commercial Real Estate Owner Occupied | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   10,900,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   14,200,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   12,300,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   6,100,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   5,600,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   5,500,000  
Financing Receivable, Excluding Accrued Interest, Revolving   1,100,000  
Loans and Leases Receivable, Allowance   55,700,000  
Commercial Real Estate Owner Occupied | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Allowance   1,800,000  
Financing Receivable, Originated in Current Fiscal Year   400,000  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year   1,400,000  
Financing Receivable, Originated Two Years before Latest Fiscal Year   0  
Financing Receivable, Originated Three Years before Latest Fiscal Year   0  
Financing Receivable, Originated Four Years before Latest Fiscal Year   0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year   0  
Financing Receivable, Revolving   0  
Commercial Real Estate Multifamily      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   369,200,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   204,900,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   189,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   52,100,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   35,000,000.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   115,700,000  
Financing Receivable, Excluding Accrued Interest, Revolving   1,000,000.0  
Loans and Leases Receivable, Allowance   966,900,000  
Less loans charged-off   5,700,000 0
Commercial Real Estate Multifamily | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   369,200,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   204,900,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   189,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   52,100,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   35,000,000.0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   113,700,000  
Financing Receivable, Excluding Accrued Interest, Revolving   1,000,000.0  
Loans and Leases Receivable, Allowance   964,900,000  
Commercial Real Estate Multifamily | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Allowance   300,000  
Financing Receivable, Originated in Current Fiscal Year   0  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year   0  
Financing Receivable, Originated Two Years before Latest Fiscal Year   0  
Financing Receivable, Originated Three Years before Latest Fiscal Year   0  
Financing Receivable, Originated Four Years before Latest Fiscal Year   0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year   300,000  
Financing Receivable, Revolving   0  
Commercial Real Estate Multifamily | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Allowance   1,700,000  
Financing Receivable, Originated in Current Fiscal Year   0  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year   0  
Financing Receivable, Originated Two Years before Latest Fiscal Year   0  
Financing Receivable, Originated Three Years before Latest Fiscal Year   0  
Financing Receivable, Originated Four Years before Latest Fiscal Year   0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year   1,700,000  
Financing Receivable, Revolving   0  
Commercial and Floor Plans      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   527,700,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   370,300,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   219,400,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   132,100,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   124,400,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   178,100,000  
Financing Receivable, Excluding Accrued Interest, Revolving   697,400,000  
Loans and Leases Receivable, Allowance   2,249,400,000  
Less loans charged-off   6,600,000 $ 3,000,000.0
Commercial and Floor Plans | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   501,700,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   358,900,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   214,400,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   124,300,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   120,300,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   171,100,000  
Financing Receivable, Excluding Accrued Interest, Revolving   631,600,000  
Loans and Leases Receivable, Allowance   2,122,300,000  
Commercial and Floor Plans | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   9,800,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   3,300,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   3,700,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   3,400,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   3,200,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   2,100,000  
Financing Receivable, Excluding Accrued Interest, Revolving   47,200,000  
Loans and Leases Receivable, Allowance   72,700,000  
Commercial and Floor Plans | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   15,900,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   6,800,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   1,300,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   4,400,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   900,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   4,900,000  
Financing Receivable, Excluding Accrued Interest, Revolving   18,500,000  
Loans and Leases Receivable, Allowance   52,700,000  
Commercial and Floor Plans | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Loans and Leases Receivable, Allowance   1,700,000  
Financing Receivable, Originated in Current Fiscal Year   300,000  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year   1,300,000  
Financing Receivable, Originated Two Years before Latest Fiscal Year   0  
Financing Receivable, Originated Three Years before Latest Fiscal Year   0  
Financing Receivable, Originated Four Years before Latest Fiscal Year   0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year   0  
Financing Receivable, Revolving   100,000  
Agriculture      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   176,100,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   67,600,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   35,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   12,200,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   10,100,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   3,300,000  
Financing Receivable, Excluding Accrued Interest, Revolving   402,100,000  
Loans and Leases Receivable, Allowance   706,400,000  
Agriculture | Pass      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   127,200,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   59,700,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   31,800,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   10,600,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   8,600,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   3,100,000  
Financing Receivable, Excluding Accrued Interest, Revolving   375,100,000  
Loans and Leases Receivable, Allowance   616,100,000  
Agriculture | Substandard      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   22,800,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   4,600,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   2,800,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   600,000  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   1,200,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   200,000  
Financing Receivable, Excluding Accrued Interest, Revolving   800,000  
Loans and Leases Receivable, Allowance   33,000,000.0  
Agriculture | Other Assets Especial Mentioned      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   26,100,000  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   2,800,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   400,000  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   1,000,000.0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   300,000  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Revolving   26,200,000  
Loans and Leases Receivable, Allowance   56,800,000  
Agriculture | Doubtful      
Loans and Leases Receivable Recorded Investment, Past Due      
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year   500,000  
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year   0  
Financing Receivable, Excluding Accrued Interest, Revolving   0  
Loans and Leases Receivable, Allowance   $ 500,000