XML 69 R57.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Loans Held for Investment - Schedule of Contractual Aging of Loans by Portfolio (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | $ 19.1 |  |
Less loans charged-off | 11.0 | $ 8.9 |
Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 1.7 |  | $ 18.8
Nonaccrual loans | 37.0 |  | 28.2
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 9,060.4 |  | 8,869.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 310.2 |  | 1,337.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,459.6 |  | 2,085.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 2,060.7 |  | 1,675.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 1,612.9 |  | 1,215.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1,212.3 |  | 774.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 2,324.3 |  | 1,706.1
Financing Receivable, Excluding Accrued Interest, Revolving | 52.4 |  | 47.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 28.0 |  | 28.1
Total | 9,060.4 |  | 8,869.2
Less loans charged-off | 2.9 |  | 7.6
Commercial real estate | Pass |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 293.8 |  | 1,268.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,426.6 |  | 2,065.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 2,041.5 |  | 1,612.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 1,556.0 |  | 1,200.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1,195.8 |  | 716.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 2,232.6 |  | 1,660.5
Financing Receivable, Excluding Accrued Interest, Revolving | 50.2 |  | 46.5
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 28.0 |  | 28.1
Total | 8,824.5 |  | 8,596.9
Commercial real estate | Other Assets Especially Mentioned |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1.9 |  | 4.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 8.0 |  | 9.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 4.5 |  | 42.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 25.2 |  | 12.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 6.4 |  | 27.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 37.5 |  | 17.1
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  | 0.3
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 83.5 |  | 113.7
Commercial real estate | Substandard |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 14.5 |  | 65.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 25.0 |  | 11.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 14.7 |  | 18.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 31.7 |  | 2.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 10.1 |  | 30.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 54.2 |  | 28.5
Financing Receivable, Excluding Accrued Interest, Revolving | 2.2 |  | 0.2
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 152.4 |  | 157.3
Commercial real estate | Doubtful |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year |  |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year |  |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year |  |  | 1.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year |  |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year |  |  | 0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year |  |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving |  |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan |  |  | 0.0
Total |  |  | 1.3
Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 2.2 |  | 3.5
Nonaccrual loans | 16.3 |  | 17.2
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 1,609.2 |  | 1,826.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 68.5 |  | 501.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 401.0 |  | 758.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 686.1 |  | 356.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 271.2 |  | 36.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 20.8 |  | 16.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 37.7 |  | 36.8
Financing Receivable, Excluding Accrued Interest, Revolving | 111.5 |  | 104.4
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 12.4 |  | 14.6
Total | 1,609.2 |  | 1,826.5
Less loans charged-off | 0.1 |  | 10.3
Total construction loans | Pass |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 67.2 |  | 493.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 399.3 |  | 735.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 666.6 |  | 331.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 271.1 |  | 36.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 20.8 |  | 16.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 36.9 |  | 36.2
Financing Receivable, Excluding Accrued Interest, Revolving | 111.5 |  | 104.4
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 7.3 |  | 13.7
Total | 1,580.7 |  | 1,768.0
Total construction loans | Other Assets Especially Mentioned |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1.3 |  | 0.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1.4 |  | 6.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 6.5 |  | 1.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.3 |  | 0.2
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.9
Total | 9.5 |  | 9.5
Total construction loans | Substandard |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.0 |  | 7.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0.3 |  | 4.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0.0 |  | 24.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.1 |  | 0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.5 |  | 0.4
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 5.1 |  | 0.0
Total | 6.0 |  | 36.0
Total construction loans | Doubtful |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0.0 |  | 13.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 13.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 13.0 |  | 13.0
Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 14.4 |  | 15.6
Nonaccrual loans | 12.5 |  | 10.7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 2,258.4 |  | 2,244.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1.5 |  | 45.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 52.9 |  | 359.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 403.9 |  | 522.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 518.1 |  | 501.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 489.0 |  | 89.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 299.6 |  | 222.2
Financing Receivable, Excluding Accrued Interest, Revolving | 471.1 |  | 471.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 22.3 |  | 32.1
Total | 2,258.4 |  | 2,244.3
Less loans charged-off | 0.2 |  | 0.6
Residential | Performing Financial Instruments [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1.4 |  | 44.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 52.0 |  | 356.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 401.5 |  | 521.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 515.8 |  | 500.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 487.4 |  | 88.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 293.5 |  | 217.1
Financing Receivable, Excluding Accrued Interest, Revolving | 471.1 |  | 471.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 22.3 |  | 32.1
Total | 2,245.0 |  | 2,233.0
Residential | Nonperforming Financial Instruments [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.1 |  | 1.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0.9 |  | 2.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 2.4 |  | 1.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 2.3 |  | 1.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1.6 |  | 0.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 6.1 |  | 5.1
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 13.4 |  | 11.3
Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 5.7 |  | 1.8
Nonaccrual loans | 4.9 |  | 5.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 719.7 |  | 716.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 38.5 |  | 96.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 84.5 |  | 154.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 151.9 |  | 133.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 132.8 |  | 98.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 93.3 |  | 58.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 184.8 |  | 136.7
Financing Receivable, Excluding Accrued Interest, Revolving | 30.9 |  | 32.3
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 3.0 |  | 7.0
Total | 719.7 |  | 716.8
Less loans charged-off | 0.0 |  | 0.0
Agricultural | Pass |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 26.9 |  | 86.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 73.4 |  | 123.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 121.9 |  | 126.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 125.7 |  | 93.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 88.8 |  | 56.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 170.9 |  | 124.3
Financing Receivable, Excluding Accrued Interest, Revolving | 30.6 |  | 31.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 3.0 |  | 7.0
Total | 641.2 |  | 649.4
Agricultural | Other Assets Especially Mentioned |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.3 |  | 2.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 6.6 |  | 9.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 4.5 |  | 3.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 3.3 |  | 1.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 2.8 |  | 1.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 13.0 |  | 11.3
Financing Receivable, Excluding Accrued Interest, Revolving | 0.2 |  | 0.5
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 30.7 |  | 30.8
Agricultural | Substandard |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 11.3 |  | 8.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 4.5 |  | 20.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 25.5 |  | 3.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 3.8 |  | 2.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1.7 |  | 0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.9 |  | 1.1
Financing Receivable, Excluding Accrued Interest, Revolving | 0.1 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 47.8 |  | 36.6
Total real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 24.0 |  | 39.7
Nonaccrual loans | 70.7 |  | 61.5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 13,647.7 |  | 13,656.8
Less loans charged-off | 3.2 | 4.8 |
Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 8.3 |  | 10.6
Nonaccrual loans | 3.4 |  | 2.7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 739.9 |  | 740.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 66.8 |  | 195.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 182.4 |  | 265.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 240.5 |  | 116.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 104.7 |  | 81.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 72.5 |  | 33.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 73.0 |  | 49.4
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 739.9 |  | 740.9
Less loans charged-off | 2.1 |  | 7.3
Indirect consumer | Performing Financial Instruments [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 66.8 |  | 194.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 181.8 |  | 264.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 239.3 |  | 115.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 104.1 |  | 81.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 72.0 |  | 32.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 72.2 |  | 48.8
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 736.2 |  | 737.8
Indirect consumer | Nonperforming Financial Instruments [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.0 |  | 0.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0.6 |  | 0.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 1.2 |  | 0.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.6 |  | 0.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.5 |  | 0.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.8 |  | 0.6
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 3.7 |  | 3.1
Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 1.3 |  | 1.1
Nonaccrual loans | 0.4 |  | 0.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 136.7 |  | 141.6
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 13.4 |  | 44.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 38.2 |  | 33.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 28.9 |  | 18.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 16.0 |  | 9.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 7.8 |  | 3.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 8.2 |  | 6.0
Financing Receivable, Excluding Accrued Interest, Revolving | 24.0 |  | 26.2
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.2 |  | 0.2
Total | 136.7 |  | 141.6
Less loans charged-off | 1.0 |  | 4.1
Direct and advance lines | Performing Financial Instruments [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 13.3 |  | 44.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 38.0 |  | 32.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 28.8 |  | 18.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 15.9 |  | 9.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 7.8 |  | 3.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 8.2 |  | 6.0
Financing Receivable, Excluding Accrued Interest, Revolving | 24.0 |  | 26.2
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.2 |  | 0.2
Total | 136.2 |  | 141.3
Direct and advance lines | Nonperforming Financial Instruments [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.1 |  | 0.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0.2 |  | 0.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0.1 |  | 0.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.1 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 0.5 |  | 0.3
Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 1.4 |  | 1.8
Nonaccrual loans | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 72.6 |  | 76.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving | 72.6 |  | 76.5
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 72.6 |  | 76.5
Less loans charged-off | 0.7 |  | 2.6
Credit card | Performing Financial Instruments [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving | 71.9 |  | 75.9
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 71.9 |  | 75.9
Credit card | Nonperforming Financial Instruments [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Revolving | 0.7 |  | 0.6
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 0.7 |  | 0.6
Total consumer loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 11.0 |  | 13.5
Nonaccrual loans | 3.8 |  | 3.0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 949.2 |  | 959.0
Less loans charged-off | 3.8 | 3.4 |
Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 11.6 |  | 15.9
Nonaccrual loans | 67.6 |  | 11.5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 2,922.2 |  | 2,906.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 146.6 |  | 508.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 478.2 |  | 533.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 492.0 |  | 407.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 381.4 |  | 225.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 210.1 |  | 111.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 353.6 |  | 277.9
Financing Receivable, Excluding Accrued Interest, Revolving | 857.9 |  | 836.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 2.4 |  | 8.2
Total | 2,922.2 |  | 2,906.8
Less loans charged-off | 4.0 | 0.7 | 3.4
Commercial | Pass |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 133.4 |  | 481.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 455.9 |  | 507.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 471.7 |  | 389.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 371.1 |  | 215.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 200.4 |  | 108.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 347.9 |  | 272.9
Financing Receivable, Excluding Accrued Interest, Revolving | 785.6 |  | 762.3
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.6 |  | 7.6
Total | 2,766.6 |  | 2,745.7
Commercial | Other Assets Especially Mentioned |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1.7 |  | 7.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 3.5 |  | 4.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 4.6 |  | 6.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 1.7 |  | 3.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 2.1 |  | 0.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 2.5 |  | 1.9
Financing Receivable, Excluding Accrued Interest, Revolving | 9.6 |  | 14.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.2 |  | 0.2
Total | 25.9 |  | 39.5
Commercial | Substandard |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 10.3 |  | 15.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 15.5 |  | 19.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 14.8 |  | 9.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 8.0 |  | 7.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 7.6 |  | 1.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 3.2 |  | 3.0
Financing Receivable, Excluding Accrued Interest, Revolving | 18.1 |  | 58.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 1.6 |  | 0.4
Total | 79.1 |  | 115.2
Commercial | Doubtful |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1.2 |  | 3.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 3.3 |  | 1.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0.9 |  | 1.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.6 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.0 |  | 0.1
Financing Receivable, Excluding Accrued Interest, Revolving | 44.6 |  | 0.1
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 50.6 |  | 6.4
Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 19.2 |  | 3.1
Nonaccrual loans | 29.9 |  | 30.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 696.0 |  | 769.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 34.8 |  | 152.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 136.0 |  | 58.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 54.5 |  | 34.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 29.3 |  | 23.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 20.1 |  | 35.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 40.8 |  | 9.5
Financing Receivable, Excluding Accrued Interest, Revolving | 376.1 |  | 449.4
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 4.4 |  | 6.5
Total | 696.0 |  | 769.4
Less loans charged-off | 0.0 | $ 0.0 | 0.0
Agricultural | Pass |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 32.8 |  | 105.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 86.2 |  | 57.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 53.5 |  | 31.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 28.2 |  | 22.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 19.3 |  | 6.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 10.6 |  | 7.2
Financing Receivable, Excluding Accrued Interest, Revolving | 347.8 |  | 421.9
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 4.4 |  | 3.4
Total | 582.8 |  | 656.0
Agricultural | Other Assets Especially Mentioned |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1.0 |  | 2.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 3.6 |  | 0.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0.7 |  | 0.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.5 |  | 0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.1 |  | 0.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.3 |  | 0.1
Financing Receivable, Excluding Accrued Interest, Revolving | 3.9 |  | 9.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 3.1
Total | 10.1 |  | 16.4
Agricultural | Substandard |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 1.0 |  | 43.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 46.2 |  | 0.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0.3 |  | 2.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.2 |  | 0.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.7 |  | 28.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 29.9 |  | 2.2
Financing Receivable, Excluding Accrued Interest, Revolving | 24.4 |  | 18.5
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  | 0.0
Total | 102.7 |  | 97.0
Agricultural | Doubtful |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0.0 |  |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0.0 |  |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0.0 |  |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0.4 |  |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0.0 |  |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0.0 |  |
Financing Receivable, Excluding Accrued Interest, Revolving | 0.0 |  |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0.0 |  |
Total | 0.4 |  |
Other, including overdrafts |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.0 |  | 0.0
Nonaccrual loans | 0.0 |  | 0.0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 0.2 |  | 0.1
Loans And Leases Held For Investment [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 65.8 |  | 72.2
Nonaccrual loans | 172.0 |  | 106.4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 18,215.3 |  | 18,292.1
30 to 59 Days Past Due | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 1.5 |  | 12.7
30 to 59 Days Past Due | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.9 |  | 3.1
30 to 59 Days Past Due | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 13.2 |  | 11.9
30 to 59 Days Past Due | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.1 |  | 1.8
30 to 59 Days Past Due | Total real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 15.7 |  | 29.5
30 to 59 Days Past Due | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 6.1 |  | 8.0
30 to 59 Days Past Due | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.8 |  | 0.9
30 to 59 Days Past Due | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.5 |  | 0.7
30 to 59 Days Past Due | Total consumer loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 7.4 |  | 9.6
30 to 59 Days Past Due | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 10.3 |  | 14.5
30 to 59 Days Past Due | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 19.1 |  | 0.1
30 to 59 Days Past Due | Other, including overdrafts |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.0 |  | 0.0
30 to 59 Days Past Due | Loans And Leases Held For Investment [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 52.5 |  | 53.7
60 to 89 Days Past Due | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.2 |  | 6.1
60 to 89 Days Past Due | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 1.2 |  | 0.4
60 to 89 Days Past Due | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.3 |  | 3.1
60 to 89 Days Past Due | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 5.6 |  | 0.0
60 to 89 Days Past Due | Total real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 7.3 |  | 9.6
60 to 89 Days Past Due | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 1.9 |  | 2.2
60 to 89 Days Past Due | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.4 |  | 0.2
60 to 89 Days Past Due | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.2 |  | 0.5
60 to 89 Days Past Due | Total consumer loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 2.5 |  | 2.9
60 to 89 Days Past Due | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.5 |  | 1.1
60 to 89 Days Past Due | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.0 |  | 0.0
60 to 89 Days Past Due | Other, including overdrafts |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.0 |  | 0.0
60 to 89 Days Past Due | Loans And Leases Held For Investment [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 10.3 |  | 13.6
Equal to or Greater than 90 Days Past Due | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.0 |  | 0.0
Equal to or Greater than 90 Days Past Due | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.1 |  | 0.0
Equal to or Greater than 90 Days Past Due | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.9 |  | 0.6
Equal to or Greater than 90 Days Past Due | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.0 |  | 0.0
Equal to or Greater than 90 Days Past Due | Total real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 1.0 |  | 0.6
Equal to or Greater than 90 Days Past Due | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.3 |  | 0.4
Equal to or Greater than 90 Days Past Due | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.1 |  | 0.0
Equal to or Greater than 90 Days Past Due | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.7 |  | 0.6
Equal to or Greater than 90 Days Past Due | Total consumer loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 1.1 |  | 1.0
Equal to or Greater than 90 Days Past Due | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.8 |  | 0.3
Equal to or Greater than 90 Days Past Due | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.1 |  | 3.0
Equal to or Greater than 90 Days Past Due | Other, including overdrafts |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.0 |  | 0.0
Equal to or Greater than 90 Days Past Due | Loans And Leases Held For Investment [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 3.0 |  | 4.9
Financial Asset, Not Past Due | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 9,021.7 |  | 8,822.2
Financial Asset, Not Past Due | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 1,590.7 |  | 1,805.8
Financial Asset, Not Past Due | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 2,231.5 |  | 2,218.0
Financial Asset, Not Past Due | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 709.1 |  | 709.6
Financial Asset, Not Past Due | Total real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 13,553.0 |  | 13,555.6
Financial Asset, Not Past Due | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 728.2 |  | 727.6
Financial Asset, Not Past Due | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 135.0 |  | 140.2
Financial Asset, Not Past Due | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 71.2 |  | 74.7
Financial Asset, Not Past Due | Total consumer loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 934.4 |  | 942.5
Financial Asset, Not Past Due | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 2,843.0 |  | 2,879.4
Financial Asset, Not Past Due | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 646.9 |  | 735.9
Financial Asset, Not Past Due | Other, including overdrafts |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 0.2 |  | 0.1
Financial Asset, Not Past Due | Loans And Leases Held For Investment [Member] |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Loan in Process | 17,977.5 |  | 18,113.5
Year One, Originated, Current Fiscal Year | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 1.7
Year One, Originated, Current Fiscal Year | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year One, Originated, Current Fiscal Year | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.3
Year One, Originated, Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year One, Originated, Current Fiscal Year | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.5
Year One, Originated, Current Fiscal Year | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.2
Year One, Originated, Current Fiscal Year | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year One, Originated, Current Fiscal Year | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.2
Year One, Originated, Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 2.9 |  | 0.3
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.1 |  | 0.0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.4 |  | 3.2
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.1 |  | 0.5
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.1 |  | 0.4
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Three, Originated, Two Years before Current Fiscal Year | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 1.7
Year Three, Originated, Two Years before Current Fiscal Year | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.1
Year Three, Originated, Two Years before Current Fiscal Year | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.1
Year Three, Originated, Two Years before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Three, Originated, Two Years before Current Fiscal Year | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 1.0 |  | 1.8
Year Three, Originated, Two Years before Current Fiscal Year | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.3 |  | 0.2
Year Three, Originated, Two Years before Current Fiscal Year | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Three, Originated, Two Years before Current Fiscal Year | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.2 |  | 0.5
Year Three, Originated, Two Years before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Four, Originated, Three Years before Current Fiscal Year | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 2.6
Year Four, Originated, Three Years before Current Fiscal Year | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Four, Originated, Three Years before Current Fiscal Year | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.1 |  | 0.1
Year Four, Originated, Three Years before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Four, Originated, Three Years before Current Fiscal Year | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.3 |  | 0.8
Year Four, Originated, Three Years before Current Fiscal Year | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.1 |  | 0.4
Year Four, Originated, Three Years before Current Fiscal Year | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Four, Originated, Three Years before Current Fiscal Year | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.1 |  | 0.5
Year Four, Originated, Three Years before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Five, Originated, Four Years before Current Fiscal Year | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Five, Originated, Four Years before Current Fiscal Year | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.1 |  | 0.6
Year Five, Originated, Four Years before Current Fiscal Year | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Five, Originated, Four Years before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Five, Originated, Four Years before Current Fiscal Year | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.1 |  | 0.3
Year Five, Originated, Four Years before Current Fiscal Year | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.1
Year Five, Originated, Four Years before Current Fiscal Year | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Year Five, Originated, Four Years before Current Fiscal Year | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.1 |  | 0.2
Year Five, Originated, Four Years before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Originated, More than Five Years before Current Fiscal Year | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 1.3
Originated, More than Five Years before Current Fiscal Year | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Originated, More than Five Years before Current Fiscal Year | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.1
Originated, More than Five Years before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Originated, More than Five Years before Current Fiscal Year | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.3 |  | 0.7
Originated, More than Five Years before Current Fiscal Year | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.5 |  | 2.6
Originated, More than Five Years before Current Fiscal Year | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Originated, More than Five Years before Current Fiscal Year | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.1
Originated, More than Five Years before Current Fiscal Year | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.1
Revolving | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.7 |  | 2.6
Revolving | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.6 |  | 1.4
Revolving | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving, Converted to Term | Commercial real estate |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving, Converted to Term | Total construction loans |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 9.6
Revolving, Converted to Term | Residential |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving, Converted to Term | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving, Converted to Term | Indirect consumer |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving, Converted to Term | Direct and advance lines |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving, Converted to Term | Credit card |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 0.0 |  | 0.0
Revolving, Converted to Term | Commercial |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | 2.9 |  | 0.1
Revolving, Converted to Term | Agricultural |  |  |
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Less loans charged-off | $ 0.0 |  | $ 0.0

X
- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(3) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of undisbursed portion of financing receivable balance. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-3 + Details
Name: | us-gaap_FinancingReceivableLoanInProcess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-34 + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (2) -Publisher SEC Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-7 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fibk_RealEstateConstructionFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fibk_AgriculturalRealEstateFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fibk_RealEstateFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fibk_ConsumerIndirectFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CreditCardReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fibk_AgriculturalFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fibk_OtherFinancingReceivableIncludingOverdraftsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fibk_LoansAndLeasesHeldForInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=fibk_YearOneOriginatedCurrentFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=fibk_YearTwoOriginatedFiscalYearBeforeCurrentFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=fibk_YearThreeOriginatedTwoYearsBeforeCurrentFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=fibk_YearFourOriginatedThreeYearsBeforeCurrentFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=fibk_YearFiveOriginatedFourYearsBeforeCurrentFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=fibk_OriginatedMoreThanFiveYearsBeforeCurrentFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=fibk_RevolvingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=fibk_RevolvingConvertedToTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |