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Loans Held for Investment - Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
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 (6.2) (16.2) (29.2) (39.8)  
Non-owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         $ 4,408.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         1,163.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         882.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         674.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         490.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         261.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         907.6
Financing Receivable, Excluding Accrued Interest, Revolving         29.2
Less loans charged-off   (0.1)   (3.0)  
Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 8,766.2   8,766.2    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 876.7   876.7    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,271.5   2,271.5    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,712.2   1,712.2    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,260.0   1,260.0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 790.0   790.0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,790.4   1,790.4    
Financing Receivable, Excluding Accrued Interest, Revolving 43.8   43.8    
Less loans charged-off   (5.8) (6.3) (10.9)  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 21.6   21.6    
Commercial | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (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     (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     (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     (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    
Commercial | Originated, More than Five Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Commercial | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Commercial | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         516.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         118.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         120.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         0.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         0.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         6.2
Financing Receivable, Excluding Accrued Interest, Revolving         270.1
Less loans charged-off   0.0   0.0  
Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         1,042.0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         461.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         399.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         112.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         45.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Revolving         21.9
Less loans charged-off   (6.6)   (6.6)  
Total construction          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off   (6.6)   (9.3)  
Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 2,212.2   2,212.2    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 39.3   39.3    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 319.1   319.1    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 514.2   514.2    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 513.4   513.4    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 93.1   93.1    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 233.0   233.0    
Financing Receivable, Excluding Accrued Interest, Revolving 475.6   475.6    
Less loans charged-off   (0.1) (0.6) (0.2)  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 24.5   24.5    
Residential | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (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     0.0    
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)    
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)    
Residential | Year Five, Originated, Four Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
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)    
Residential | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Residential | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 1,930.3   1,930.3    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 450.4   450.4    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 833.9   833.9    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 444.3   444.3    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 39.6   39.6    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 16.5   16.5    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 39.4   39.4    
Financing Receivable, Excluding Accrued Interest, Revolving 102.8   102.8    
Less loans charged-off     (9.7)    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 3.4   3.4    
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    
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    
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     (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    
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     0.0    
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    
Total construction loans | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Total construction loans | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (9.6)    
Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 731.5   731.5   794.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 72.1   72.1   204.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 159.5   159.5   185.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 165.0   165.0   115.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 100.2   100.2   68.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 61.7   61.7   59.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 144.6   144.6   119.6
Financing Receivable, Excluding Accrued Interest, Revolving 28.3   28.3   42.5
Less loans charged-off   0.0 0.0 (0.2)  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.1   0.1    
Agricultural | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     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    
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    
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    
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    
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    
Agricultural | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Agricultural | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Total real estate          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off (1.8) (12.5) (16.6) (20.6)  
Indirect consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 751.7   751.7   829.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 142.9   142.9   381.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 293.6   293.6   177.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 129.0   129.0   130.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 92.7   92.7   60.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 38.7   38.7   33.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 54.8   54.8   46.7
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0   0.0
Less loans charged-off   (1.2) (5.2) (2.9)  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 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)    
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     (2.0)    
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     (1.6)    
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     (0.6)    
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     (0.2)    
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     (0.6)    
Indirect consumer | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Indirect consumer | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Direct consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 142.3   142.3   152.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 35.3   35.3   52.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 36.9   36.9   32.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 21.2   21.2   18.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 10.8   10.8   8.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 4.4   4.4   6.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 7.0   7.0   9.0
Financing Receivable, Excluding Accrued Interest, Revolving 26.5   26.5   25.9
Less loans charged-off   (1.4) (3.2) (2.8)  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.2   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)    
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     (0.3)    
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     (0.2)    
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     (0.3)    
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)    
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     (2.1)    
Direct consumer | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)    
Direct consumer | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 71.6   71.6    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0   0.0   178.1
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 71.6   71.6    
Less loans charged-off   (0.3) (2.0) (1.8)  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 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    
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    
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    
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    
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    
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    
Credit card | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (2.0)    
Credit card | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Total consumer loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off (3.7) (2.9) (10.4) (7.5)  
Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 2,925.1   2,925.1    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 395.8   395.8    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 565.6   565.6    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 427.3   427.3    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 236.4   236.4    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 123.5   123.5    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 323.4   323.4    
Financing Receivable, Excluding Accrued Interest, Revolving 843.1   843.1    
Less loans charged-off (0.7) (0.8) (2.2) (6.3)  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 10.0   10.0    
Commercial | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Commercial | Year Two, Originated, Fiscal Year Before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (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     (0.3)    
Commercial | Year Four, Originated, Three Years before Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.4)    
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)    
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)    
Commercial | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.9)    
Commercial | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     (0.1)    
Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 690.5   690.5   706.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 123.1   123.1   176.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 76.6   76.6   67.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 38.1   38.1   35.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 27.1   27.1   12.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 8.4   8.4   10.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 11.1   11.1   3.3
Financing Receivable, Excluding Accrued Interest, Revolving 400.1   400.1   402.1
Less loans charged-off 0.0 0.0 0.0 (5.4)  
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 6.0   6.0    
Agricultural | Year One, Originated, Current Fiscal Year          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     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    
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    
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    
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    
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    
Agricultural | Revolving          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Agricultural | Revolving, Converted to Term          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off     0.0    
Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         3,153.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         812.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         737.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         548.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         281.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         179.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         574.0
Financing Receivable, Excluding Accrued Interest, Revolving         19.8
Less loans charged-off   0.0   (2.2)  
Multi-family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         966.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         369.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         204.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         189.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         52.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         35.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         115.7
Financing Receivable, Excluding Accrued Interest, Revolving         1.0
Less loans charged-off   (5.7)   (5.7)  
Commercial and floor plans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         2,249.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         527.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         370.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         219.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         132.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         124.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         178.1
Financing Receivable, Excluding Accrued Interest, Revolving         697.4
Less loans charged-off   (0.5)   (5.8)  
Commercial purpose secured by 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         532.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         192.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         136.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         72.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         30.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         32.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         40.9
Financing Receivable, Excluding Accrued Interest, Revolving         28.9
Less loans charged-off   0.0   0.0  
Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Less loans charged-off   (0.3)   (0.5)  
Residential 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         1,639.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         258.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         490.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         541.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         98.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         32.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         217.5
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Less loans charged-off   0.0   (0.1)  
Consumer Home Equity and HELOC          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         548.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         24.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         8.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         5.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         5.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         5.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         16.4
Financing Receivable, Excluding Accrued Interest, Revolving         483.0
Land Acquisition And Development Construction Financing Receivable [Member]          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         386.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         159.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         117.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         29.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         17.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         11.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         29.1
Financing Receivable, Excluding Accrued Interest, Revolving         22.2
Less loans charged-off   $ 0.0   $ (2.7)  
Pass | Non-owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         4,313.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         1,162.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         861.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         661.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         467.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         241.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         890.4
Financing Receivable, Excluding Accrued Interest, Revolving         29.2
Pass | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 8,520.2   8,520.2    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 845.8   845.8    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,240.2   2,240.2    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1,649.9   1,649.9    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1,245.7   1,245.7    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 732.7   732.7    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1,741.5   1,741.5    
Financing Receivable, Excluding Accrued Interest, Revolving 42.8   42.8    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 21.6   21.6    
Pass | Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         515.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         118.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         119.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         0.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         0.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         5.8
Financing Receivable, Excluding Accrued Interest, Revolving         270.1
Pass | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         964.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         442.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         374.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         89.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         45.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Revolving         10.6
Pass | Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 1,864.3   1,864.3    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 444.9   444.9    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 806.1   806.1    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 413.3   413.3    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 39.4   39.4    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 16.5   16.5    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 38.7   38.7    
Financing Receivable, Excluding Accrued Interest, Revolving 102.8   102.8    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 2.6   2.6    
Pass | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 665.7   665.7   710.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 60.5   60.5   180.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 133.1   133.1   172.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 158.8   158.8   109.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 95.9   95.9   64.8
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 59.4   59.4   46.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 130.1   130.1   105.1
Financing Receivable, Excluding Accrued Interest, Revolving 27.8   27.8   31.4
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.1   0.1    
Pass | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 2,762.7   2,762.7    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 383.8   383.8    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 537.2   537.2    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 408.5   408.5    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 224.5   224.5    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 116.4   116.4    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 317.0   317.0    
Financing Receivable, Excluding Accrued Interest, Revolving 765.8   765.8    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 9.5   9.5    
Pass | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 610.7   610.7   616.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 77.2   77.2   127.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 74.8   74.8   59.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 35.9   35.9   31.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 25.5   25.5   10.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 7.7   7.7   8.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 9.6   9.6   3.1
Financing Receivable, Excluding Accrued Interest, Revolving 374.0   374.0   375.1
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 6.0   6.0    
Pass | Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         3,047.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         793.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         718.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         533.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         266.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         165.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         551.3
Financing Receivable, Excluding Accrued Interest, Revolving         18.2
Pass | Multi-family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         964.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         369.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         204.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         189.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         52.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         35.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         113.7
Financing Receivable, Excluding Accrued Interest, Revolving         1.0
Pass | Commercial and floor plans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         2,122.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         501.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         358.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         214.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         124.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         120.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         171.1
Financing Receivable, Excluding Accrued Interest, Revolving         631.6
Pass | Commercial purpose secured by 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         524.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         191.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         134.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         69.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         30.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         29.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         39.5
Financing Receivable, Excluding Accrued Interest, Revolving         28.9
Pass | Land Acquisition And Development Construction Financing Receivable [Member]          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         374.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         152.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         114.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         29.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         17.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         10.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         28.4
Financing Receivable, Excluding Accrued Interest, Revolving         22.2
Other Assets Especially Mentioned | Non-owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         22.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         1.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         6.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         2.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         4.6
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         7.4
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Other Assets Especially Mentioned | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 101.3   101.3    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 2.9   2.9    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 5.0   5.0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 41.3   41.3    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 4.7   4.7    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 26.9   26.9    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 20.5   20.5    
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Other Assets Especially Mentioned | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         36.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         2.3
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         23.1
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         11.3
Other Assets Especially Mentioned | Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 23.0   23.0    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 4.1   4.1    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 11.4   11.4    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 6.5   6.5    
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 0.2   0.2    
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.8   0.8    
Other Assets Especially Mentioned | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 21.8   21.8   51.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 3.5   3.5   22.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 6.6   6.6   0.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1.4   1.4   1.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 2.1   2.1   2.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 1.8   1.8   10.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 5.9   5.9   3.2
Financing Receivable, Excluding Accrued Interest, Revolving 0.5   0.5   11.0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Other Assets Especially Mentioned | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 37.4   37.4    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 2.3   2.3    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 4.9   4.9    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 6.7   6.7    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 4.7   4.7    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 2.5   2.5    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1.4   1.4    
Financing Receivable, Excluding Accrued Interest, Revolving 14.8   14.8    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.1   0.1    
Other Assets Especially Mentioned | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 13.1   13.1   56.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.9   0.9   26.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1.1   1.1   2.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.8   0.8   0.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.2   0.2   1.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.2   0.2   0.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.2   0.2   0.0
Financing Receivable, Excluding Accrued Interest, Revolving 9.7   9.7   26.2
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Other Assets Especially Mentioned | Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         55.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         10.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         14.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         12.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         6.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         5.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         5.5
Financing Receivable, Excluding Accrued Interest, Revolving         1.1
Other Assets Especially Mentioned | Multi-family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         1.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         1.7
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Other Assets Especially Mentioned | Commercial and floor plans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         52.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         15.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         6.8
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         4.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         4.9
Financing Receivable, Excluding Accrued Interest, Revolving         18.5
Other Assets Especially Mentioned | Commercial purpose secured by 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         5.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         0.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         1.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         2.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         1.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         0.2
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Other Assets Especially Mentioned | Land Acquisition And Development Construction Financing Receivable [Member]          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         7.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         6.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         0.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         0.3
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Substandard | Non-owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         72.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         0.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         13.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         10.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         18.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         19.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         9.8
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Substandard | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 143.0   143.0    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 28.0   28.0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 26.0   26.0    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 19.6   19.6    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 9.6   9.6    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 30.4   30.4    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 28.4   28.4    
Financing Receivable, Excluding Accrued Interest, Revolving 1.0   1.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Substandard | Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         0.9
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         0.5
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         0.4
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Substandard | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         41.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         16.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         24.4
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
Substandard | Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 29.9   29.9    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 1.4   1.4    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 3.3   3.3    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 24.5   24.5    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.2   0.2    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.5   0.5    
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Substandard | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 44.0   44.0   32.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 8.1   8.1   1.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 19.8   19.8   12.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 4.8   4.8   3.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 2.2   2.2   0.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.5   0.5   2.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 8.6   8.6   11.3
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0   0.1
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Substandard | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 118.8   118.8    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 5.0   5.0    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 23.3   23.3    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 10.9   10.9    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 7.2   7.2    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 4.6   4.6    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 5.0   5.0    
Financing Receivable, Excluding Accrued Interest, Revolving 62.4   62.4    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.4   0.4    
Substandard | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 66.7   66.7   33.0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 45.0   45.0   22.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.7   0.7   4.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1.4   1.4   2.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 1.4   1.4   0.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.5   0.5   1.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 1.3   1.3   0.2
Financing Receivable, Excluding Accrued Interest, Revolving 16.4   16.4   0.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Substandard | Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         48.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         8.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         3.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         2.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         8.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         8.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         17.2
Financing Receivable, Excluding Accrued Interest, Revolving         0.5
Substandard | Multi-family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         0.3
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         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         0.3
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Substandard | Commercial and floor plans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         72.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         9.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         3.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         3.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         3.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         3.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         2.1
Financing Receivable, Excluding Accrued Interest, Revolving         47.2
Substandard | Commercial purpose secured by 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         3.0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         0.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         0.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         0.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         0.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         1.2
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Substandard | Land Acquisition And Development Construction Financing Receivable [Member]          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         0.9
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         0.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         0.2
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         0.4
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Doubtful | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 1.7   1.7    
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 0.3   0.3    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1.4   1.4    
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    
Doubtful | Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 13.1   13.1    
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 13.1   13.1    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Doubtful | Agricultural          
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
Doubtful | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 6.2   6.2    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 4.7   4.7    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.2   0.2    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1.2   1.2    
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 0.1   0.1    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Doubtful | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         0.5
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         0.5
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
Doubtful | Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         1.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         0.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         1.4
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
Doubtful | Commercial and floor plans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         1.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         0.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         1.3
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         0.1
Doubtful | Land Acquisition And Development Construction Financing Receivable [Member]          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         3.2
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         3.2
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
Performing | Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 2,201.7   2,201.7    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 38.6   38.6    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 317.5   317.5    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 513.2   513.2    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 512.8   512.8    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 92.3   92.3    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 227.2   227.2    
Financing Receivable, Excluding Accrued Interest, Revolving 475.6   475.6    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 24.5   24.5    
Performing | Indirect consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 748.3   748.3   826.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 142.5   142.5   380.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 292.4   292.4   176.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 128.3   128.3   130.0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 92.3   92.3   59.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 38.5   38.5   33.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 54.3   54.3   46.3
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    
Performing | Direct consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 142.1   142.1   152.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 35.3   35.3   52.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 36.8   36.8   31.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 21.1   21.1   18.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 10.8   10.8   8.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 4.4   4.4   6.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 7.0   7.0   8.9
Financing Receivable, Excluding Accrued Interest, Revolving 26.5   26.5   25.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.2   0.2    
Performing | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 71.1   71.1    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0   0.0   177.3
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 71.1   71.1    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Performing | Residential 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         1,634.6
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         258.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         490.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         541.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         98.0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         32.0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         213.8
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Performing | Consumer Home Equity and HELOC          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         546.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         23.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         8.0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         5.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         5.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         5.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         15.2
Financing Receivable, Excluding Accrued Interest, Revolving         482.8
Nonperforming | Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 10.5   10.5    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.7   0.7    
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1.6   1.6    
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 1.0   1.0    
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.6   0.6    
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.8   0.8    
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 5.8   5.8    
Financing Receivable, Excluding Accrued Interest, Revolving 0.0   0.0    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Nonperforming | Indirect consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 3.4   3.4   3.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.4   0.4   1.0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 1.2   1.2   0.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.7   0.7   0.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 0.4   0.4   0.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year 0.2   0.2   0.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year 0.5   0.5   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    
Nonperforming | Direct consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 0.2   0.2   0.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0   0.0   0.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year 0.1   0.1   0.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year 0.1   0.1   0.1
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 0.0   0.0   0.1
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan 0.0   0.0    
Nonperforming | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total 0.5   0.5    
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year 0.0   0.0   0.8
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 0.5   0.5    
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan $ 0.0   $ 0.0    
Nonperforming | Residential 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         4.8
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         0.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         0.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         0.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         3.7
Financing Receivable, Excluding Accrued Interest, Revolving         0.0
Nonperforming | Consumer Home Equity and HELOC          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Total         2.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         0.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year         0.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year         0.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year         0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year         0.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year         1.2
Financing Receivable, Excluding Accrued Interest, Revolving         0.2
Agriculture Portfolio Segment [Member] | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         1.9
Agriculture Portfolio Segment [Member] | Performing | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         1.9
Agriculture Portfolio Segment [Member] | Nonperforming | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         0.0
Commercial | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         100.3
Commercial | Performing | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         100.0
Commercial | Nonperforming | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         0.3
Total consumer loans | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         75.9
Total consumer loans | Performing | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         75.4
Total consumer loans | Nonperforming | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year         $ 0.5