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Loans - Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator (Details) - USD ($)
Mar. 31, 2020
Mar. 27, 2020
Dec. 31, 2019
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Total loans, net of deferred fees and costs $ 9,012,400,000 $ 1,000,000,000.0 $ 9,031,600,000
Loans and Leases Receivable, Net of Deferred Income     8,936,200,000
Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 115.3    
2019 355.9    
2018 260.9    
2017 135.8    
2016 179.1    
Prior 474.7    
Revolving Loans Amortized Cost Basis 20.5    
Total loans, net of deferred fees and costs 1,542.2    
Commercial Real Estate      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     3,487,800,000
Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 38.4    
2019 94.1    
2018 54.3    
2017 40.4    
2016 12.4    
Prior 44.3    
Revolving Loans Amortized Cost Basis 6.6    
Total loans, net of deferred fees and costs 290.5    
Loans and Leases Receivable, Net of Deferred Income     302,100,000
Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 22.5    
2019 121.8    
2018 29.3    
2017 6.9    
2016 0.3    
Prior 0.4    
Revolving Loans Amortized Cost Basis 47.2    
Total loans, net of deferred fees and costs 228.4    
Loans and Leases Receivable, Net of Deferred Income     244,100,000
Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 51.9    
2019 223.3    
2018 141.2    
2017 24.4    
2016 10.0    
Prior 0.7    
Revolving Loans Amortized Cost Basis 7.9    
Total loans, net of deferred fees and costs 459.4    
Loans and Leases Receivable, Net of Deferred Income     431,500,000
Total construction      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     977,700,000
Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     1,246,100,000
Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 11.7    
2019 69.8    
2018 40.7    
2017 24.8    
2016 19.8    
Prior 47.5    
Revolving Loans Amortized Cost Basis 10.3    
Total loans, net of deferred fees and costs 224.6    
Loans and Leases Receivable, Net of Deferred Income     226,600,000
Real Estate Loan      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     5,938,200,000
Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 70.3    
2019 267.7    
2018 174.9    
2017 115.7    
2016 79.5    
Prior 66.5    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 774.6    
Loans and Leases Receivable, Net of Deferred Income     784,600,000
Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 13.6    
2019 45.0    
2018 46.7    
2017 20.1    
2016 9.5    
Prior 13.4    
Revolving Loans Amortized Cost Basis 26.7    
Total loans, net of deferred fees and costs 175.0    
Loans and Leases Receivable, Net of Deferred Income     1,045,200,000
Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 152.5    
Loans and Leases Receivable, Net of Deferred Income     81,600,000
Total consumer loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     179,000,000.0
Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     1,673,700,000
Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 109.4    
2019 360.6    
2018 303.3    
2017 180.4    
2016 228.0    
Prior 496.8    
Revolving Loans Amortized Cost Basis 18.7    
Total loans, net of deferred fees and costs 1,697.2    
Multi-family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 28.9    
2019 78.5    
2018 31.3    
2017 32.4    
2016 28.9    
Prior 102.9    
Revolving Loans Amortized Cost Basis 1.1    
Total loans, net of deferred fees and costs 304.0    
Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 131.5    
2019 274.2    
2018 200.8    
2017 124.6    
2016 68.6    
Prior 124.8    
Revolving Loans Amortized Cost Basis 355.9    
Total loans, net of deferred fees and costs 1,280.4    
Commercial purpose secured by 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 23.5    
2019 80.4    
2018 56.3    
2017 30.7    
2016 21.4    
Prior 66.6    
Revolving Loans Amortized Cost Basis 26.5    
Total loans, net of deferred fees and costs 305.4    
Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 25.8    
2019 43.3    
2018 25.7    
2017 8.8    
2016 4.9    
Prior 2.3    
Revolving Loans Amortized Cost Basis 145.4    
Total loans, net of deferred fees and costs 256.2    
Loans and Leases Receivable, Net of Deferred Income     279,100,000
Residential 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 33.8    
2019 139.3    
2018 103.1    
2017 81.8    
2016 97.1    
Prior 347.6    
Revolving Loans Amortized Cost Basis 0.2    
Total loans, net of deferred fees and costs 802.9    
Consumer Home Equity and HELOC      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 3.4    
2019 12.4    
2018 11.2    
2017 14.8    
2016 6.2    
Prior 22.1    
Revolving Loans Amortized Cost Basis 358.0    
Total loans, net of deferred fees and costs 428.1    
Pass      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     8,548,800,000
Pass | Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 99.7    
2019 349.3    
2018 259.5    
2017 133.6    
2016 176.3    
Prior 446.4    
Revolving Loans Amortized Cost Basis 20.5    
Total loans, net of deferred fees and costs 1,485.3    
Pass | Commercial Real Estate      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     3,305,000,000.0
Pass | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 38.3    
2019 93.6    
2018 53.9    
2017 38.9    
2016 12.4    
Prior 42.1    
Revolving Loans Amortized Cost Basis 5.9    
Total loans, net of deferred fees and costs 285.1    
Loans and Leases Receivable, Net of Deferred Income     295,400,000
Pass | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 22.5    
2019 121.8    
2018 27.5    
2017 6.9    
2016 0.3    
Prior 0.4    
Revolving Loans Amortized Cost Basis 47.2    
Total loans, net of deferred fees and costs 226.6    
Loans and Leases Receivable, Net of Deferred Income     241,000,000.0
Pass | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 51.9    
2019 222.3    
2018 139.3    
2017 24.4    
2016 10.0    
Prior 0.6    
Revolving Loans Amortized Cost Basis 7.7    
Total loans, net of deferred fees and costs 456.2    
Loans and Leases Receivable, Net of Deferred Income     428,300,000
Pass | Total construction      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     964,700,000
Pass | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     1,235,400,000
Pass | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 11.1    
2019 57.1    
2018 35.2    
2017 22.3    
2016 16.1    
Prior 36.7    
Revolving Loans Amortized Cost Basis 7.8    
Total loans, net of deferred fees and costs 186.3    
Loans and Leases Receivable, Net of Deferred Income     185,700,000
Pass | Real Estate Loan      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     5,690,800,000
Pass | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     781,500,000
Pass | Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     1,040,800,000
Pass | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     81,600,000
Pass | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     177,700,000
Pass | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     1,569,400,000
Pass | Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 100.5    
2019 348.8    
2018 283.6    
2017 170.0    
2016 194.2    
Prior 459.0    
Revolving Loans Amortized Cost Basis 17.6    
Total loans, net of deferred fees and costs 1,573.7    
Pass | Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 116.6    
2019 247.2    
2018 186.4    
2017 120.9    
2016 58.9    
Prior 118.1    
Revolving Loans Amortized Cost Basis 329.4    
Total loans, net of deferred fees and costs 1,177.5    
Pass | Commercial purpose secured by 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 22.9    
2019 74.1    
2018 49.2    
2017 29.4    
2016 19.6    
Prior 63.5    
Revolving Loans Amortized Cost Basis 25.7    
Total loans, net of deferred fees and costs 284.4    
Pass | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 19.3    
2019 40.9    
2018 18.8    
2017 7.4    
2016 4.5    
Prior 1.8    
Revolving Loans Amortized Cost Basis 131.2    
Total loans, net of deferred fees and costs 223.9    
Loans and Leases Receivable, Net of Deferred Income     247,800,000
Other Assets Especially Mentioned      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     157,500,000
Other Assets Especially Mentioned | Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 15.4    
2019 3.7    
2018 0.7    
2017 0.9    
2016 1.7    
Prior 13.2    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 35.6    
Other Assets Especially Mentioned | Commercial Real Estate      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     84,700,000
Other Assets Especially Mentioned | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0.4    
2018 0.1    
2017 1.0    
2016 0    
Prior 1.5    
Revolving Loans Amortized Cost Basis 0.3    
Total loans, net of deferred fees and costs 3.3    
Loans and Leases Receivable, Net of Deferred Income     3,800,000
Other Assets Especially Mentioned | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0.2    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0.2    
Loans and Leases Receivable, Net of Deferred Income     900,000
Other Assets Especially Mentioned | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 1.5    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0.2    
Total loans, net of deferred fees and costs 1.7    
Loans and Leases Receivable, Net of Deferred Income     1,700,000
Other Assets Especially Mentioned | Total construction      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     6,400,000
Other Assets Especially Mentioned | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     2,600,000
Other Assets Especially Mentioned | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0.6    
2019 2.2    
2018 1.0    
2017 1.4    
2016 0.1    
Prior 5.0    
Revolving Loans Amortized Cost Basis 0.6    
Total loans, net of deferred fees and costs 10.9    
Loans and Leases Receivable, Net of Deferred Income     14,300,000
Other Assets Especially Mentioned | Real Estate Loan      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     108,000,000.0
Other Assets Especially Mentioned | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     200,000
Other Assets Especially Mentioned | Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     600,000
Other Assets Especially Mentioned | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     0
Other Assets Especially Mentioned | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     400,000
Other Assets Especially Mentioned | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     40,400,000
Other Assets Especially Mentioned | Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 2.1    
2019 1.7    
2018 9.8    
2017 4.7    
2016 14.0    
Prior 17.4    
Revolving Loans Amortized Cost Basis 0.5    
Total loans, net of deferred fees and costs 50.2    
Other Assets Especially Mentioned | Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 4.3    
2019 3.6    
2018 5.2    
2017 2.6    
2016 4.5    
Prior 0.6    
Revolving Loans Amortized Cost Basis 7.4    
Total loans, net of deferred fees and costs 28.2    
Other Assets Especially Mentioned | Commercial purpose secured by 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0.3    
2019 2.5    
2018 0.8    
2017 0.8    
2016 0.5    
Prior 1.2    
Revolving Loans Amortized Cost Basis 0.7    
Total loans, net of deferred fees and costs 6.8    
Other Assets Especially Mentioned | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 1.1    
2019 0.4    
2018 1.8    
2017 0    
2016 0.1    
Prior 0    
Revolving Loans Amortized Cost Basis 6.0    
Total loans, net of deferred fees and costs 9.4    
Loans and Leases Receivable, Net of Deferred Income     8,500,000
Substandard      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     224,000,000.0
Substandard | Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0.2    
2019 2.9    
2018 0.5    
2017 1.3    
2016 1.1    
Prior 15.0    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 21.0    
Substandard | Commercial Real Estate      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     97,300,000
Substandard | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0.1    
2019 0.1    
2018 0.3    
2017 0.5    
2016 0    
Prior 0.5    
Revolving Loans Amortized Cost Basis 0.4    
Total loans, net of deferred fees and costs 1.9    
Loans and Leases Receivable, Net of Deferred Income     1,900,000
Substandard | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 1.2    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 1.2    
Loans and Leases Receivable, Net of Deferred Income     2,200,000
Substandard | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 1.0    
2018 0.4    
2017 0    
2016 0    
Prior 0.1    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 1.5    
Loans and Leases Receivable, Net of Deferred Income     1,500,000
Substandard | Total construction      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     5,600,000
Substandard | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     7,800,000
Substandard | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 10.5    
2018 4.5    
2017 1.1    
2016 3.6    
Prior 5.8    
Revolving Loans Amortized Cost Basis 1.9    
Total loans, net of deferred fees and costs 27.4    
Loans and Leases Receivable, Net of Deferred Income     26,600,000
Substandard | Real Estate Loan      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     137,300,000
Substandard | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     2,900,000
Substandard | Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     3,700,000
Substandard | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     0
Substandard | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     800,000
Substandard | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     60,300,000
Substandard | Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 6.6    
2019 10.1    
2018 9.7    
2017 5.6    
2016 19.3    
Prior 19.9    
Revolving Loans Amortized Cost Basis 0.6    
Total loans, net of deferred fees and costs 71.8    
Substandard | Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 10.5    
2019 21.7    
2018 8.8    
2017 0.9    
2016 5.2    
Prior 5.7    
Revolving Loans Amortized Cost Basis 18.7    
Total loans, net of deferred fees and costs 71.5    
Substandard | Commercial purpose secured by 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0.3    
2019 3.7    
2018 6.2    
2017 0.5    
2016 1.3    
Prior 1.7    
Revolving Loans Amortized Cost Basis 0.1    
Total loans, net of deferred fees and costs 13.8    
Substandard | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 5.4    
2019 2.0    
2018 5.1    
2017 1.4    
2016 0.3    
Prior 0.5    
Revolving Loans Amortized Cost Basis 8.2    
Total loans, net of deferred fees and costs 22.9    
Loans and Leases Receivable, Net of Deferred Income     22,700,000
Doubtful      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     5,900,000
Doubtful | Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0.2    
2017 0    
2016 0    
Prior 0.1    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0.3    
Doubtful | Commercial Real Estate      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     800,000
Doubtful | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior 0.2    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0.2    
Loans and Leases Receivable, Net of Deferred Income     1,000,000.0
Doubtful | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0.4    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0.4    
Loans and Leases Receivable, Net of Deferred Income     0
Doubtful | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0    
Loans and Leases Receivable, Net of Deferred Income     0
Doubtful | Total construction      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     1,000,000.0
Doubtful | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     300,000
Doubtful | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0    
Loans and Leases Receivable, Net of Deferred Income     0
Doubtful | Real Estate Loan      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     2,100,000
Doubtful | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     0
Doubtful | Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     100,000
Doubtful | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     0
Doubtful | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     100,000
Doubtful | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     3,600,000
Doubtful | Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0.2    
2019 0    
2018 0.2    
2017 0.1    
2016 0.5    
Prior 0.5    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 1.5    
Doubtful | Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0.1    
2019 1.7    
2018 0.4    
2017 0.2    
2016 0    
Prior 0.4    
Revolving Loans Amortized Cost Basis 0.4    
Total loans, net of deferred fees and costs 3.2    
Doubtful | Commercial purpose secured by 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0.1    
2018 0.1    
2017 0    
2016 0    
Prior 0.2    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0.4    
Doubtful | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0    
Loans and Leases Receivable, Net of Deferred Income     100,000
Total Criticized Loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     387,400,000
Total Criticized Loans | Commercial Real Estate      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     182,800,000
Total Criticized Loans | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     6,700,000
Total Criticized Loans | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     3,100,000
Total Criticized Loans | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     3,200,000
Total Criticized Loans | Total construction      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     13,000,000.0
Total Criticized Loans | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     10,700,000
Total Criticized Loans | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     40,900,000
Total Criticized Loans | Real Estate Loan      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     247,400,000
Total Criticized Loans | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     3,100,000
Total Criticized Loans | Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     4,400,000
Total Criticized Loans | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     0
Total Criticized Loans | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     1,300,000
Total Criticized Loans | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     104,300,000
Total Criticized Loans | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans and Leases Receivable, Net of Deferred Income     $ 31,300,000
Performing | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 70.3    
2019 267.3    
2018 174.5    
2017 115.6    
2016 79.4    
Prior 66.3    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 773.4    
Performing | Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 13.6    
2019 44.9    
2018 46.6    
2017 20.0    
2016 9.4    
Prior 13.4    
Revolving Loans Amortized Cost Basis 26.7    
Total loans, net of deferred fees and costs 174.6    
Performing | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 150.8    
Performing | Multi-family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 28.9    
2019 78.5    
2018 31.3    
2017 32.4    
2016 28.9    
Prior 102.9    
Revolving Loans Amortized Cost Basis 1.1    
Total loans, net of deferred fees and costs 304.0    
Performing | Residential 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 33.8    
2019 139.1    
2018 103.1    
2017 81.8    
2016 96.5    
Prior 346.4    
Revolving Loans Amortized Cost Basis 0.2    
Total loans, net of deferred fees and costs 800.9    
Performing | Consumer Home Equity and HELOC      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 3.4    
2019 12.4    
2018 11.1    
2017 14.6    
2016 5.9    
Prior 22.0    
Revolving Loans Amortized Cost Basis 358.0    
Total loans, net of deferred fees and costs 427.4    
Nonperforming | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0.4    
2018 0.4    
2017 0.1    
2016 0.1    
Prior 0.2    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 1.2    
Nonperforming | Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0.1    
2018 0.1    
2017 0.1    
2016 0.1    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0.4    
Nonperforming | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 1.7    
Nonperforming | Multi-family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0    
Nonperforming | Residential 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0.2    
2018 0    
2017 0    
2016 0.6    
Prior 1.2    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 2.0    
Nonperforming | Consumer Home Equity and HELOC      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0.1    
2017 0.2    
2016 0.3    
Prior 0.1    
Revolving Loans Amortized Cost Basis 0    
Total loans, net of deferred fees and costs 0.7    
Agricultural | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 1.7    
Agricultural | Performing | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 1.7    
Agricultural | Nonperforming | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
Commercial | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 74.2    
Commercial | Performing | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 73.4    
Commercial | Nonperforming | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0.8    
Total consumer loans | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 76.6    
Total consumer loans | Performing | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 75.7    
Total consumer loans | Nonperforming | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 $ 0.9