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Loans Held for Investment - Schedule of Recorded Credit Quality Indicator (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Commitments to purchase or sell $ 0.0 $ 0.0 $ 0.0 $ 0.0  
Proceeds from sale of loans held-for-investment 0.0 0.0 0.0 0.0  
Less loans charged-off (29.1) (6.2) (56.4) (29.2)  
Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 9,219.3   9,219.3   $ 8,869.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1,067.0   1,067.0   1,337.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,386.3   1,386.3   2,085.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 2,007.2   2,007.2   1,675.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,499.3   1,499.3   1,215.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,147.4   1,147.4   774.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 2,007.2   2,007.2   1,706.1
Financing Receivable, Excluding Accrued Interest, Revolving 48.2   48.2   47.0
Less loans charged-off     (21.6)   (7.6)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 56.7   56.7   28.1
Commercial | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   (1.7)
Commercial | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (5.7)   (0.3)
Commercial | Year Three, Originated, Two Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   (1.7)
Commercial | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (15.8)   (2.6)
Commercial | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Commercial | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)   (1.3)
Commercial | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Commercial | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 2,217.8   2,217.8   2,244.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 15.6   15.6   45.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 71.3   71.3   359.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 423.5   423.5   522.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 491.3   491.3   501.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 456.3   456.3   89.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 270.0   270.0   222.2
Financing Receivable, Excluding Accrued Interest, Revolving 480.2   480.2   471.8
Less loans charged-off     (0.7)   (0.6)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 9.6   9.6   32.1
Residential | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   (0.3)
Residential | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.2)   0.0
Residential | Year Three, Originated, Two Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)   (0.1)
Residential | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)   (0.1)
Residential | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.2)   0.0
Residential | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)   (0.1)
Residential | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Residential | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 1,307.9   1,307.9   1,826.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 261.2   261.2   501.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 263.4   263.4   758.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 490.8   490.8   356.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 114.0   114.0   36.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 19.7   19.7   16.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 24.6   24.6   36.8
Financing Receivable, Excluding Accrued Interest, Revolving 129.3   129.3   104.4
Less loans charged-off     (13.2)   (10.3)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 4.9   4.9   14.6
Total construction loans | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Total construction loans | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Total construction loans | Year Three, Originated, Two Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (13.1)   (0.1)
Total construction loans | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Total construction loans | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)   (0.6)
Total construction loans | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Total construction loans | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Total construction loans | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   (9.6)
Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 726.4   726.4   716.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 105.5   105.5   96.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 76.0   76.0   154.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 138.7   138.7   133.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 130.2   130.2   98.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 88.9   88.9   58.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 161.3   161.3   136.7
Financing Receivable, Excluding Accrued Interest, Revolving 25.8   25.8   32.3
Less loans charged-off     0.0   0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   7.0
Agricultural | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Year Three, Originated, Two Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Total real estate          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off (22.2) (1.8) (35.5) (16.6)  
Indirect consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 742.2   742.2   740.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 203.3   203.3   195.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 147.7   147.7   265.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 195.8   195.8   116.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 83.5   83.5   81.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 55.8   55.8   33.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 56.1   56.1   49.4
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0   0.0
Less loans charged-off     (6.9)   (7.3)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.0
Indirect consumer | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.2)   (0.5)
Indirect consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (1.7)   (3.2)
Indirect consumer | Year Three, Originated, Two Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (2.9)   (1.8)
Indirect consumer | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.9)   (0.8)
Indirect consumer | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.3)   (0.3)
Indirect consumer | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.9)   (0.7)
Indirect consumer | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Indirect consumer | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Direct consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 136.9   136.9   141.6
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 37.2   37.2   44.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 29.9   29.9   33.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 22.3   22.3   18.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 12.0   12.0   9.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 5.5   5.5   3.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 6.0   6.0   6.0
Financing Receivable, Excluding Accrued Interest, Revolving 24.0   24.0   26.2
Less loans charged-off     (2.9)   (4.1)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.2
Direct consumer | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)   (0.2)
Direct consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.5)   (0.5)
Direct consumer | Year Three, Originated, Two Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.7)   (0.2)
Direct consumer | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.2)   (0.4)
Direct consumer | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)   (0.1)
Direct consumer | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (1.3)   (2.6)
Direct consumer | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   (0.1)
Direct consumer | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 76.4   76.4   76.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Revolving 76.4   76.4   76.5
Less loans charged-off     (2.1)   (2.6)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.0
Credit card | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Credit card | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Credit card | Year Three, Originated, Two Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Credit card | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Credit card | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Credit card | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Credit card | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (2.1)   (2.6)
Credit card | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Total consumer loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off (4.1) (3.7) (11.9) (10.4)  
Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 2,919.7   2,919.7   2,906.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 419.1   419.1   508.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 408.3   408.3   533.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 423.8   423.8   407.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 342.5   342.5   225.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 185.2   185.2   111.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 282.9   282.9   277.9
Financing Receivable, Excluding Accrued Interest, Revolving 851.2   851.2   836.0
Less loans charged-off (2.5) (0.7) (8.7) (2.2) (3.4)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 6.7   6.7   8.2
Commercial | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.4)   (0.2)
Commercial | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (1.9)   (0.4)
Commercial | Year Three, Originated, Two Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (1.0)   (0.5)
Commercial | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.3)   (0.5)
Commercial | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)   (0.2)
Commercial | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)   (0.1)
Commercial | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (1.9)   (1.4)
Commercial | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (3.0)   (0.1)
Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 689.8   689.8   769.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 133.7   133.7   152.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 80.7   80.7   58.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 43.9   43.9   34.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 20.7   20.7   23.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 18.3   18.3   35.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 7.6   7.6   9.5
Financing Receivable, Excluding Accrued Interest, Revolving 384.8   384.8   449.4
Less loans charged-off (0.3) $ 0.0 (0.3) $ 0.0 0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.1   0.1   6.5
Agricultural | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Year Three, Originated, Two Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.3)   0.0
Agricultural | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Agricultural | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0   0.0
Pass | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 8,980.9   8,980.9   8,596.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1,026.8   1,026.8   1,268.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,366.2   1,366.2   2,065.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,981.5   1,981.5   1,612.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,441.7   1,441.7   1,200.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1,137.3   1,137.3   716.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,922.5   1,922.5   1,660.5
Financing Receivable, Excluding Accrued Interest, Revolving 48.2   48.2   46.5
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 56.7   56.7   28.1
Pass | Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 1,296.0   1,296.0   1,768.0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 256.1   256.1   493.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 263.4   263.4   735.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 484.4   484.4   331.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 114.0   114.0   36.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 19.7   19.7   16.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 24.2   24.2   36.2
Financing Receivable, Excluding Accrued Interest, Revolving 129.3   129.3   104.4
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 4.9   4.9   13.7
Pass | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 657.3   657.3   649.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 92.2   92.2   86.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 65.0   65.0   123.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 113.6   113.6   126.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 121.4   121.4   93.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 79.9   79.9   56.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 159.4   159.4   124.3
Financing Receivable, Excluding Accrued Interest, Revolving 25.8   25.8   31.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   7.0
Pass | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 2,768.8   2,768.8   2,745.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 386.0   386.0   481.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 395.5   395.5   507.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 406.9   406.9   389.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 335.8   335.8   215.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 176.1   176.1   108.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 278.3   278.3   272.9
Financing Receivable, Excluding Accrued Interest, Revolving 783.5   783.5   762.3
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 6.7   6.7   7.6
Pass | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 577.3   577.3   656.0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 81.3   81.3   105.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 52.5   52.5   57.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 43.2   43.2   31.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 20.5   20.5   22.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 16.7   16.7   6.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 7.4   7.4   7.2
Financing Receivable, Excluding Accrued Interest, Revolving 355.7   355.7   421.9
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   3.4
Other Assets Especially Mentioned | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 100.5   100.5   113.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 12.6   12.6   4.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 9.4   9.4   9.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 21.1   21.1   42.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 18.3   18.3   12.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 2.2   2.2   27.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 36.9   36.9   17.1
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0   0.3
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.0
Other Assets Especially Mentioned | Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 9.6   9.6   9.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 3.2   3.2   0.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0   0.0   6.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 6.4   6.4   1.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0   0.0   0.2
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.9
Other Assets Especially Mentioned | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 27.3   27.3   30.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1.1   1.1   2.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 6.6   6.6   9.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 5.9   5.9   3.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 5.1   5.1   1.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 7.6   7.6   1.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1.0   1.0   11.3
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0   0.5
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.0
Other Assets Especially Mentioned | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 39.7   39.7   39.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 3.0   3.0   7.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 6.9   6.9   4.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 8.8   8.8   6.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1.5   1.5   3.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1.0   1.0   0.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1.0   1.0   1.9
Financing Receivable, Excluding Accrued Interest, Revolving 17.5   17.5   14.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.2
Other Assets Especially Mentioned | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 11.4   11.4   16.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.5   0.5   2.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 3.6   3.6   0.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.7   0.7   0.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.1   0.1   0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1.0   1.0   0.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.2   0.2   0.1
Financing Receivable, Excluding Accrued Interest, Revolving 5.2   5.2   9.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.1   0.1   3.1
Substandard | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 137.9   137.9   157.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 27.6   27.6   65.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 10.7   10.7   11.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 4.6   4.6   18.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 39.3   39.3   2.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 7.9   7.9   30.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 47.8   47.8   28.5
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0   0.2
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.0
Substandard | Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 2.3   2.3   36.0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1.9   1.9   7.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.0   0.0   4.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0   0.0   24.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0   0.0   0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.4   0.4   0.4
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.0
Substandard | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 41.8   41.8   36.6
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 12.2   12.2   8.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 4.4   4.4   20.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 19.2   19.2   3.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 3.7   3.7   2.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1.4   1.4   0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.9   0.9   1.1
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.0
Substandard | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 62.7   62.7   115.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 28.9   28.9   15.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 4.2   4.2   19.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 5.6   5.6   9.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 5.2   5.2   7.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 8.1   8.1   1.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 3.6   3.6   3.0
Financing Receivable, Excluding Accrued Interest, Revolving 7.1   7.1   58.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.4
Substandard | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 101.1   101.1   97.0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 51.9   51.9   43.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 24.6   24.6   0.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0   0.0   2.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.1   0.1   0.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.6   0.6   28.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0   0.0   2.2
Financing Receivable, Excluding Accrued Interest, Revolving 23.9   23.9   18.5
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0   0.0
Doubtful | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         1.3
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
Doubtful | Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         13.0
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         13.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan         0.0
Doubtful | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 48.5   48.5   6.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1.2   1.2   3.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1.7   1.7   1.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 2.5   2.5   1.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0   0.0   0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0   0.0   0.1
Financing Receivable, Excluding Accrued Interest, Revolving 43.1   43.1   0.1
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan $ 0.0   $ 0.0   $ 0.0