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Loans Held for Investment - Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Impaired financing receivable, recorded investment $ 94,700,000    
Commitments to purchase or sell 0 $ 0  
Proceeds from sale of loans held-for-investment $ 0 $ 0  
Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator
The Company evaluates the credit quality and loan performance for the allowance for credit loan losses of the following segments based on the aforementioned risk scale for the periods indicated:
March 31, 2022
Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral20222021202020192018PriorRevolving Loans Amortized Cost BasisTotal
Commercial real estate non-owner occupied:
Pass$182.1 $845.0 $737.0 $517.2 $344.9 $1,023.6 $67.6 $3,717.4 
Special mention— 33.4 5.9 21.6 34.0 37.1 — 132.0 
Substandard3.7 21.5 25.5 49.8 36.8 27.8 23.8 188.9 
Doubtful— 0.3 — — — — — 0.3 
Total$185.8 $900.2 $768.4 $588.6 $415.7 $1,088.5 $91.4 $4,038.6 
Commercial real estate owner occupied:
Pass$189.4 $843.8 $585.4 $336.9 $220.4 $585.0 $54.7 $2,815.6 
Special mention0.7 3.2 4.2 8.5 7.9 15.7 0.1 40.3 
Substandard6.8 6.1 4.2 6.3 15.4 22.0 0.2 61.0 
Doubtful— — — — 1.8 2.0 — 3.8 
Total$196.9 $853.1 $593.8 $351.7 $245.5 $624.7 $55.0 $2,920.7 
March 31, 2022
Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral20222021202020192018PriorRevolving Loans Amortized Cost BasisTotal
Commercial multi-family:
Pass$86.2 $218.9 $194.7 $62.2 $45.5 $141.1 $4.7 $753.3 
Special mention— — — — — 0.1 — 0.1 
Substandard— — 37.7 1.2 47.2 0.3 — 86.4 
Doubtful— — 6.6 — — — — 6.6 
Total$86.2 $218.9 $239.0 $63.4 $92.7 $141.5 $4.7 $846.4 
Land, acquisition and development:
Pass$25.3 $175.2 $43.4 $28.8 $16.2 $37.5 $13.2 $339.6 
Special mention— — 0.1 — 0.2 0.4 — 0.7 
Substandard— 0.7 0.2 — — 0.4 — 1.3 
Doubtful— 3.2 — — — — — 3.2 
Total$25.3 $179.1 $43.7 $28.8 $16.4 $38.3 $13.2 $344.8 
Residential construction:
Pass$29.7 $165.4 $6.7 $10.3 $0.8 $6.4 $185.9 $405.2 
Substandard— — 0.4 — — 0.4 — 0.8 
Total$29.7 $165.4 $7.1 $10.3 $0.8 $6.8 $185.9 $406.0 
Commercial construction:
Pass$118.2 $353.6 $201.4 $161.6 $6.6 $0.6 $0.4 $842.4 
Substandard— — — 2.4 — — — 2.4 
Total$118.2 $353.6 $201.4 $164.0 $6.6 $0.6 $0.4 $844.8 
Agricultural real estate:
Pass$44.2 $220.5 $132.1 $76.7 $59.7 $131.8 $56.2 $721.2 
Special mention— 7.1 2.8 1.2 12.7 7.6 10.0 41.4 
Substandard0.8 18.1 5.4 5.0 20.0 17.8 — 67.1 
Doubtful— 0.2 1.2 — — 2.5 — 3.9 
Total$45.0 $245.9 $141.5 $82.9 $92.4 $159.7 $66.2 $833.6 
Commercial and floor plans:
Pass$142.4 $582.5 $282.5 $169.5 $162.9 $233.4 $818.5 $2,391.7 
Special mention— 4.1 0.6 1.1 1.3 3.0 18.1 28.2 
Substandard9.2 7.6 5.1 2.2 5.4 8.8 16.1 54.4 
Doubtful— — — — — 3.3 0.2 3.5 
Total$151.6 $594.2 $288.2 $172.8 $169.6 $248.5 $852.9 $2,477.8 
Commercial purpose secured by 1-4 family:
Pass$48.0 $152.9 $78.0 $37.6 $35.5 $53.3 $15.5 $420.8 
Special mention— 0.2 0.6 0.6 2.0 0.7 — 4.1 
Substandard0.1 1.3 1.2 0.7 0.5 1.5 0.1 5.4 
Total$48.1 $154.4 $79.8 $38.9 $38.0 $55.5 $15.6 $430.3 
Agricultural:
Pass$25.9 $137.5 $40.6 $15.1 $12.3 $9.5 $396.4 $637.3 
Special mention0.4 3.1 0.7 1.2 2.7 0.3 17.9 26.3 
Substandard1.8 25.8 6.8 0.9 4.4 1.1 34.8 75.6 
Doubtful— — — — 2.5 0.9 — 3.4 
Total$28.1 $166.4 $48.1 $17.2 $21.9 $11.8 $449.1 $742.6 
December 31, 2021
Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral20212020201920182017PriorRevolving Loans Amortized Cost BasisTotal
Commercial real estate non-owner occupied:
Pass$507.9 $452.2 $237.9 $150.4 $76.3 $409.0 $15.3 $1,849.0 
Special mention0.2 3.1 2.1 — — 3.6 — 9.0 
Substandard3.9 15.3 2.3 0.7 1.0 12.4 — 35.6 
Total$512.0 $470.6 $242.3 $151.1 $77.3 $425.0 $15.3 $1,893.6 
Commercial real estate owner occupied:
Pass$452.7 $314.9 $235.0 $151.0 $94.5 $322.5 $14.2 $1,584.8 
Special mention1.3 3.2 1.5 7.4 3.5 13.8 — 30.7 
Substandard3.8 4.3 4.7 5.4 2.7 20.3 — 41.2 
Total$457.8 $322.4 $241.2 $163.8 $100.7 $356.6 $14.2 $1,656.7 
Commercial multi-family:
Pass$129.1 $118.6 $43.9 $15.4 $36.0 $76.7 $1.5 $421.2 
Total$129.1 $118.6 $43.9 $15.4 $36.0 $76.7 $1.5 $421.2 
Land, acquisition and development:
Pass$113.0 $41.5 $34.2 $14.8 $19.8 $20.8 $1.2 $245.3 
Special mention— 0.1 — — 0.1 0.3 — 0.5 
Substandard0.8 0.2 — 0.6 0.3 0.1 — 2.0 
Total$113.8 $41.8 $34.2 $15.4 $20.2 $21.2 $1.2 $247.8 
Residential construction:
Pass$112.4 $7.0 $13.7 $0.9 $— $— $127.2 $261.2 
Substandard— 0.4 — — 0.4 — — 0.8 
Total$112.4 $7.4 $13.7 $0.9 $0.4 $— $127.2 $262.0 
Commercial construction:
Pass$209.7 $141.4 $118.8 $27.6 $— $0.5 $— $498.0 
Total$209.7 $141.4 $118.8 $27.6 $— $0.5 $— $498.0 
Agricultural real estate:
Pass$58.3 $36.9 $35.1 $22.6 $11.8 $28.1 $4.9 $197.7 
Special mention0.1 1.3 1.2 0.1 0.1 0.9 0.9 4.6 
Substandard4.0 0.4 1.0 0.6 1.3 4.3 — 11.6 
Total$62.4 $38.6 $37.3 $23.3 $13.2 $33.3 $5.8 $213.9 
Commercial and floor plans:
Pass$394.2 $165.7 $94.5 $73.5 $47.1 $91.3 $224.7 $1,091.0 
Special mention0.8 11.4 0.8 0.8 3.0 2.3 7.0 26.1 
Substandard1.3 2.8 1.6 2.6 0.6 4.1 2.6 15.6 
Total$396.3 $179.9 $96.9 $76.9 $50.7 $97.7 $234.3 $1,132.7 
Commercial purpose secured by 1-4 family:
Pass$94.9 $55.0 $27.8 $23.1 $15.3 $32.2 $14.4 $262.7 
Special mention— 0.2 0.2 0.5 0.1 0.6 — 1.6 
Substandard1.3 1.2 0.6 0.6 0.2 1.3 0.1 5.3 
Total$96.2 $56.4 $28.6 $24.2 $15.6 $34.1 $14.5 $269.6 
Agricultural:
Pass$35.1 $16.2 $9.0 $5.4 $2.1 $1.6 $108.9 $178.3 
Special mention0.2 4.1 0.1 0.4 0.6 0.3 7.0 12.7 
Substandard4.9 0.7 0.6 2.5 — 0.1 2.6 11.4 
Total$40.2 $21.0 $9.7 $8.3 $2.7 $2.0 $118.5 $202.4 
The following tables present the recorded investment of our other loan portfolios based on the credit risk profile of loans that are performing and loans that are nonperforming as of the periods indicated:
March 31, 2022
Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral20222021202020192018PriorRevolving Loans Amortized Cost BasisTotal
Residential 1-4 family:
Performing$34.5 $446.5 $581.5 $112.5 $35.5 $260.3 $0.9 $1,471.7 
Nonperforming— — 0.1 0.3 0.3 3.8 — 4.5 
Total$34.5 $446.5 $581.6 $112.8 $35.8 $264.1 $0.9 $1,476.2 
Consumer home equity and HELOC:
Performing$4.6 $16.5 $10.6 $5.8 $6.9 $19.5 $454.8 $518.7 
Nonperforming— 0.5 0.2 0.2 0.1 1.1 0.5 2.6 
Total$4.6 $17.0 $10.8 $6.0 $7.0 $20.6 $455.3 $521.3 
Consumer indirect:
Performing$78.4 $251.6 $187.0 $94.4 $54.9 $71.3 $— $737.6 
Nonperforming— 0.5 0.5 0.3 0.2 0.5 — 2.0 
Total$78.4 $252.1 $187.5 $94.7 $55.1 $71.8 $— $739.6 
Consumer direct and advance line:
Performing$13.4 $42.4 $25.7 $13.8 $11.1 $12.4 $23.7 $142.5 
Total$13.4 $42.4 $25.7 $13.8 $11.1 $12.4 $23.7 $142.5 
The following table presents the recorded investment in credit card loans based on payment activity for the periods indicated:
As of March 31, 2022ConsumerCommercialAgriculturalTotal
Credit Card:
Performing$73.1 $109.5 $1.8 $184.4 
Nonperforming0.4 0.3 — 0.7 
Total credit card$73.5 $109.8 $1.8 $185.1 
As of December 31, 2021ConsumerCommercialAgriculturalTotal
Credit Card:
Performing$64.4 $73.1 $1.5 $139.0 
Nonperforming0.5 0.1 — 0.6 
Total credit card$64.9 $73.2 $1.5 $139.6 
In the normal course of business, th 		   
Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 $ 185,800,000   $ 512,000,000.0
2019 900,200,000   470,600,000
2018 768,400,000   242,300,000
2017 588,600,000   151,100,000
2016 415,700,000   77,300,000
Prior 1,088,500,000   425,000,000.0
Revolving Loans Amortized Cost Basis 91,400,000   15,300,000
Total 4,038,600,000   1,893,600,000
Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans held for investment 7,805,700,000   3,971,500,000
Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 25,300,000   113,800,000
2019 179,100,000   41,800,000
2018 43,700,000   34,200,000
2017 28,800,000   15,400,000
2016 16,400,000   20,200,000
Prior 38,300,000   21,200,000
Revolving Loans Amortized Cost Basis 13,200,000   1,200,000
Total 344,800,000   247,800,000
Loans held for investment 344,800,000   247,800,000
Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 29,700,000   112,400,000
2019 165,400,000   7,400,000
2018 7,100,000   13,700,000
2017 10,300,000   900,000
2016 800,000   400,000
Prior 6,800,000   0
Revolving Loans Amortized Cost Basis 185,900,000   127,200,000
Total 406,000,000.0   262,000,000.0
Loans held for investment 406,000,000.0   262,000,000.0
Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 118,200,000   209,700,000
2019 353,600,000   141,400,000
2018 201,400,000   118,800,000
2017 164,000,000.0   27,600,000
2016 6,600,000   0
Prior 600,000   500,000
Revolving Loans Amortized Cost Basis 400,000   0
Total 844,800,000   498,000,000.0
Loans held for investment 844,800,000   498,000,000.0
Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans held for investment 1,997,500,000   1,538,200,000
Total construction loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans held for investment 1,595,600,000   1,007,800,000
Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 45,000,000.0   62,400,000
2019 245,900,000   38,600,000
2018 141,500,000   37,300,000
2017 82,900,000   23,300,000
2016 92,400,000   13,200,000
Prior 159,700,000   33,300,000
Revolving Loans Amortized Cost Basis 66,200,000   5,800,000
Total 833,600,000   213,900,000
Loans held for investment 833,600,000   213,900,000
Total real estate loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans held for investment 12,232,400,000   6,731,400,000
Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 78,400,000   273,100,000
2019 252,100,000   209,100,000
2018 187,500,000   108,700,000
2017 94,700,000   64,200,000
2016 55,100,000   37,100,000
Prior 71,800,000   45,400,000
Revolving Loans Amortized Cost Basis 0   0
Total 739,600,000   737,600,000
Loans held for investment 739,600,000   737,600,000
Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 13,400,000   42,600,000
2019 42,400,000   27,900,000
2018 25,700,000   15,000,000.0
2017 13,800,000   13,400,000
2016 11,100,000   5,800,000
Prior 12,400,000   7,600,000
Revolving Loans Amortized Cost Basis 23,700,000   16,900,000
Total 142,500,000   129,200,000
Loans held for investment 142,500,000   129,200,000
Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 185,100,000   139,600,000
Loans held for investment 73,500,000   64,900,000
Total consumer loans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans held for investment 955,600,000   931,700,000
Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
Loans held for investment 3,017,900,000   1,475,500,000
Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020     40,200,000
2019     21,000,000.0
2018     9,700,000
2017     8,300,000
2016     2,700,000
Prior     2,000,000.0
Revolving Loans Amortized Cost Basis     118,500,000
Total     202,400,000
Loans held for investment 744,300,000   203,900,000
Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 196,900,000   457,800,000
2019 853,100,000   322,400,000
2018 593,800,000   241,200,000
2017 351,700,000   163,800,000
2016 245,500,000   100,700,000
Prior 624,700,000   356,600,000
Revolving Loans Amortized Cost Basis 55,000,000.0   14,200,000
Total 2,920,700,000   1,656,700,000
Multi-family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 86,200,000   129,100,000
2019 218,900,000   118,600,000
2018 239,000,000.0   43,900,000
2017 63,400,000   15,400,000
2016 92,700,000   36,000,000.0
Prior 141,500,000   76,700,000
Revolving Loans Amortized Cost Basis 4,700,000   1,500,000
Total 846,400,000   421,200,000
Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 151,600,000   396,300,000
2019 594,200,000   179,900,000
2018 288,200,000   96,900,000
2017 172,800,000   76,900,000
2016 169,600,000   50,700,000
Prior 248,500,000   97,700,000
Revolving Loans Amortized Cost Basis 852,900,000   234,300,000
Total 2,477,800,000   1,132,700,000
Commercial purpose secured by 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 48,100,000   96,200,000
2019 154,400,000   56,400,000
2018 79,800,000   28,600,000
2017 38,900,000   24,200,000
2016 38,000,000.0   15,600,000
Prior 55,500,000   34,100,000
Revolving Loans Amortized Cost Basis 15,600,000   14,500,000
Total 430,300,000   269,600,000
Agriculture Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 28,100,000    
2019 166,400,000    
2018 48,100,000    
2017 17,200,000    
2016 21,900,000    
Prior 11,800,000    
Revolving Loans Amortized Cost Basis 449,100,000    
Total 742,600,000    
Residential 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 34,500,000   360,900,000
2019 446,500,000   477,300,000
2018 581,600,000   74,700,000
2017 112,800,000   27,500,000
2016 35,800,000   25,900,000
Prior 264,100,000   177,300,000
Revolving Loans Amortized Cost Basis 900,000   0
Total 1,476,200,000   1,143,600,000
Consumer Home Equity and HELOC      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 4,600,000   11,400,000
2019 17,000,000.0   7,000,000.0
2018 10,800,000   4,000,000.0
2017 6,000,000.0   4,800,000
2016 7,000,000.0   4,200,000
Prior 20,600,000   12,500,000
Revolving Loans Amortized Cost Basis 455,300,000   350,700,000
Total 521,300,000   394,600,000
Pass | Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 182,100,000   507,900,000
2019 845,000,000.0   452,200,000
2018 737,000,000.0   237,900,000
2017 517,200,000   150,400,000
2016 344,900,000   76,300,000
Prior 1,023,600,000   409,000,000.0
Revolving Loans Amortized Cost Basis 67,600,000   15,300,000
Total 3,717,400,000   1,849,000,000
Pass | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 25,300,000   113,000,000.0
2019 175,200,000   41,500,000
2018 43,400,000   34,200,000
2017 28,800,000   14,800,000
2016 16,200,000   19,800,000
Prior 37,500,000   20,800,000
Revolving Loans Amortized Cost Basis 13,200,000   1,200,000
Total 339,600,000   245,300,000
Pass | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 29,700,000   112,400,000
2019 165,400,000   7,000,000.0
2018 6,700,000   13,700,000
2017 10,300,000   900,000
2016 800,000   0
Prior 6,400,000   0
Revolving Loans Amortized Cost Basis 185,900,000   127,200,000
Total 405,200,000   261,200,000
Pass | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 118,200,000   209,700,000
2019 353,600,000   141,400,000
2018 201,400,000   118,800,000
2017 161,600,000   27,600,000
2016 6,600,000   0
Prior 600,000   500,000
Revolving Loans Amortized Cost Basis 400,000   0
Total 842,400,000   498,000,000.0
Pass | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 44,200,000   58,300,000
2019 220,500,000   36,900,000
2018 132,100,000   35,100,000
2017 76,700,000   22,600,000
2016 59,700,000   11,800,000
Prior 131,800,000   28,100,000
Revolving Loans Amortized Cost Basis 56,200,000   4,900,000
Total 721,200,000   197,700,000
Pass | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020     35,100,000
2019     16,200,000
2018     9,000,000.0
2017     5,400,000
2016     2,100,000
Prior     1,600,000
Revolving Loans Amortized Cost Basis     108,900,000
Total     178,300,000
Pass | Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 189,400,000   452,700,000
2019 843,800,000   314,900,000
2018 585,400,000   235,000,000.0
2017 336,900,000   151,000,000.0
2016 220,400,000   94,500,000
Prior 585,000,000.0   322,500,000
Revolving Loans Amortized Cost Basis 54,700,000   14,200,000
Total 2,815,600,000   1,584,800,000
Pass | Multi-family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 86,200,000   129,100,000
2019 218,900,000   118,600,000
2018 194,700,000   43,900,000
2017 62,200,000   15,400,000
2016 45,500,000   36,000,000.0
Prior 141,100,000   76,700,000
Revolving Loans Amortized Cost Basis 4,700,000   1,500,000
Total 753,300,000   421,200,000
Pass | Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 142,400,000   394,200,000
2019 582,500,000   165,700,000
2018 282,500,000   94,500,000
2017 169,500,000   73,500,000
2016 162,900,000   47,100,000
Prior 233,400,000   91,300,000
Revolving Loans Amortized Cost Basis 818,500,000   224,700,000
Total 2,391,700,000   1,091,000,000
Pass | Commercial purpose secured by 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 48,000,000.0   94,900,000
2019 152,900,000   55,000,000.0
2018 78,000,000.0   27,800,000
2017 37,600,000   23,100,000
2016 35,500,000   15,300,000
Prior 53,300,000   32,200,000
Revolving Loans Amortized Cost Basis 15,500,000   14,400,000
Total 420,800,000   262,700,000
Pass | Agriculture Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 25,900,000    
2019 137,500,000    
2018 40,600,000    
2017 15,100,000    
2016 12,300,000    
Prior 9,500,000    
Revolving Loans Amortized Cost Basis 396,400,000    
Total 637,300,000    
Other Assets Especially Mentioned | Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   200,000
2019 33,400,000   3,100,000
2018 5,900,000   2,100,000
2017 21,600,000   0
2016 34,000,000.0   0
Prior 37,100,000   3,600,000
Revolving Loans Amortized Cost Basis 0   0
Total 132,000,000.0   9,000,000.0
Other Assets Especially Mentioned | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   0
2019 0   100,000
2018 100,000   0
2017 0   0
2016 200,000   100,000
Prior 400,000   300,000
Revolving Loans Amortized Cost Basis 0   0
Total 700,000   500,000
Other Assets Especially Mentioned | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   100,000
2019 7,100,000   1,300,000
2018 2,800,000   1,200,000
2017 1,200,000   100,000
2016 12,700,000   100,000
Prior 7,600,000   900,000
Revolving Loans Amortized Cost Basis 10,000,000.0   900,000
Total 41,400,000   4,600,000
Other Assets Especially Mentioned | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020     200,000
2019     4,100,000
2018     100,000
2017     400,000
2016     600,000
Prior     300,000
Revolving Loans Amortized Cost Basis     7,000,000.0
Total     12,700,000
Other Assets Especially Mentioned | Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 700,000   1,300,000
2019 3,200,000   3,200,000
2018 4,200,000   1,500,000
2017 8,500,000   7,400,000
2016 7,900,000   3,500,000
Prior 15,700,000   13,800,000
Revolving Loans Amortized Cost Basis 100,000   0
Total 40,300,000   30,700,000
Other Assets Especially Mentioned | Multi-family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior 100,000    
Revolving Loans Amortized Cost Basis 0    
Total 100,000    
Other Assets Especially Mentioned | Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   800,000
2019 4,100,000   11,400,000
2018 600,000   800,000
2017 1,100,000   800,000
2016 1,300,000   3,000,000.0
Prior 3,000,000.0   2,300,000
Revolving Loans Amortized Cost Basis 18,100,000   7,000,000.0
Total 28,200,000   26,100,000
Other Assets Especially Mentioned | Commercial purpose secured by 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   0
2019 200,000   200,000
2018 600,000   200,000
2017 600,000   500,000
2016 2,000,000.0   100,000
Prior 700,000   600,000
Revolving Loans Amortized Cost Basis 0   0
Total 4,100,000   1,600,000
Other Assets Especially Mentioned | Agriculture Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 400,000    
2019 3,100,000    
2018 700,000    
2017 1,200,000    
2016 2,700,000    
Prior 300,000    
Revolving Loans Amortized Cost Basis 17,900,000    
Total 26,300,000    
Substandard | Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 3,700,000   3,900,000
2019 21,500,000   15,300,000
2018 25,500,000   2,300,000
2017 49,800,000   700,000
2016 36,800,000   1,000,000.0
Prior 27,800,000   12,400,000
Revolving Loans Amortized Cost Basis 23,800,000   0
Total 188,900,000   35,600,000
Substandard | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   800,000
2019 700,000   200,000
2018 200,000   0
2017 0   600,000
2016 0   300,000
Prior 400,000   100,000
Revolving Loans Amortized Cost Basis 0   0
Total 1,300,000   2,000,000.0
Substandard | Residential      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   0
2019 0   400,000
2018 400,000   0
2017 0   0
2016 0   400,000
Prior 400,000   0
Revolving Loans Amortized Cost Basis 0   0
Total 800,000   800,000
Substandard | Commercial      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 2,400,000    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total 2,400,000    
Substandard | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 800,000   4,000,000.0
2019 18,100,000   400,000
2018 5,400,000   1,000,000.0
2017 5,000,000.0   600,000
2016 20,000,000.0   1,300,000
Prior 17,800,000   4,300,000
Revolving Loans Amortized Cost Basis 0   0
Total 67,100,000   11,600,000
Substandard | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020     4,900,000
2019     700,000
2018     600,000
2017     2,500,000
2016     0
Prior     100,000
Revolving Loans Amortized Cost Basis     2,600,000
Total     11,400,000
Substandard | Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 6,800,000   3,800,000
2019 6,100,000   4,300,000
2018 4,200,000   4,700,000
2017 6,300,000   5,400,000
2016 15,400,000   2,700,000
Prior 22,000,000.0   20,300,000
Revolving Loans Amortized Cost Basis 200,000   0
Total 61,000,000.0   41,200,000
Substandard | Multi-family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 37,700,000    
2017 1,200,000    
2016 47,200,000    
Prior 300,000    
Revolving Loans Amortized Cost Basis 0    
Total 86,400,000    
Substandard | Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 9,200,000   1,300,000
2019 7,600,000   2,800,000
2018 5,100,000   1,600,000
2017 2,200,000   2,600,000
2016 5,400,000   600,000
Prior 8,800,000   4,100,000
Revolving Loans Amortized Cost Basis 16,100,000   2,600,000
Total 54,400,000   15,600,000
Substandard | Commercial purpose secured by 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 100,000   1,300,000
2019 1,300,000   1,200,000
2018 1,200,000   600,000
2017 700,000   600,000
2016 500,000   200,000
Prior 1,500,000   1,300,000
Revolving Loans Amortized Cost Basis 100,000   100,000
Total 5,400,000   5,300,000
Substandard | Agriculture Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 1,800,000    
2019 25,800,000    
2018 6,800,000    
2017 900,000    
2016 4,400,000    
Prior 1,100,000    
Revolving Loans Amortized Cost Basis 34,800,000    
Total 75,600,000    
Doubtful | Non-owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 300,000    
2018 0    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total 300,000    
Doubtful | Land acquisition & development      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 3,200,000    
2018 0    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total 3,200,000    
Doubtful | Agricultural      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 200,000    
2018 1,200,000    
2017 0    
2016 0    
Prior 2,500,000    
Revolving Loans Amortized Cost Basis 0    
Total 3,900,000    
Doubtful | Owner occupied      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 1,800,000    
Prior 2,000,000.0    
Revolving Loans Amortized Cost Basis 0    
Total 3,800,000    
Doubtful | Multi-family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 6,600,000    
2017 0    
2016 0    
Prior 0    
Revolving Loans Amortized Cost Basis 0    
Total 6,600,000    
Doubtful | Commercial and floor plans      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 0    
Prior 3,300,000    
Revolving Loans Amortized Cost Basis 200,000    
Total 3,500,000    
Doubtful | Agriculture Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0    
2019 0    
2018 0    
2017 0    
2016 2,500,000    
Prior 900,000    
Revolving Loans Amortized Cost Basis 0    
Total 3,400,000    
Performing | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 78,400,000   272,600,000
2019 251,600,000   208,600,000
2018 187,000,000.0   108,300,000
2017 94,400,000   64,000,000.0
2016 54,900,000   37,000,000.0
Prior 71,300,000   45,000,000.0
Revolving Loans Amortized Cost Basis 0   0
Total 737,600,000   735,500,000
Performing | Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 13,400,000   42,500,000
2019 42,400,000   27,900,000
2018 25,700,000   15,000,000.0
2017 13,800,000   13,300,000
2016 11,100,000   5,800,000
Prior 12,400,000   7,600,000
Revolving Loans Amortized Cost Basis 23,700,000   16,900,000
Total 142,500,000   129,000,000.0
Performing | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 184,400,000   139,000,000.0
Performing | Residential 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 34,500,000   360,900,000
2019 446,500,000   477,000,000.0
2018 581,500,000   74,700,000
2017 112,500,000   27,500,000
2016 35,500,000   25,700,000
Prior 260,300,000   176,500,000
Revolving Loans Amortized Cost Basis 900,000   0
Total 1,471,700,000   1,142,300,000
Performing | Consumer Home Equity and HELOC      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 4,600,000   11,100,000
2019 16,500,000   7,000,000.0
2018 10,600,000   3,700,000
2017 5,800,000   4,800,000
2016 6,900,000   3,600,000
Prior 19,500,000   12,000,000.0
Revolving Loans Amortized Cost Basis 454,800,000   350,700,000
Total 518,700,000   392,900,000
Nonperforming | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   500,000
2019 500,000   500,000
2018 500,000   400,000
2017 300,000   200,000
2016 200,000   100,000
Prior 500,000   400,000
Revolving Loans Amortized Cost Basis 0   0
Total 2,000,000.0   2,100,000
Nonperforming | Direct consumer      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020     100,000
2019     0
2018     0
2017     100,000
2016     0
Prior     0
Revolving Loans Amortized Cost Basis     0
Total     200,000
Nonperforming | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 700,000   600,000
Nonperforming | Residential 1-4 family      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   0
2019 0   300,000
2018 100,000   0
2017 300,000   0
2016 300,000   200,000
Prior 3,800,000   800,000
Revolving Loans Amortized Cost Basis 0   0
Total 4,500,000   1,300,000
Nonperforming | Consumer Home Equity and HELOC      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   300,000
2019 500,000   0
2018 200,000   300,000
2017 200,000   0
2016 100,000   600,000
Prior 1,100,000   500,000
Revolving Loans Amortized Cost Basis 500,000   0
Total 2,600,000   1,700,000
Agriculture Portfolio Segment [Member] | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 1,800,000   1,500,000
Agriculture Portfolio Segment [Member] | Performing | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 1,800,000   1,500,000
Agriculture Portfolio Segment [Member] | Nonperforming | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 0   0
Commercial | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 109,800,000   73,200,000
Commercial | Performing | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 109,500,000   73,100,000
Commercial | Nonperforming | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 300,000   100,000
Total consumer loans | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 73,500,000   64,900,000
Total consumer loans | Performing | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 73,100,000   64,400,000
Total consumer loans | Nonperforming | Credit card      
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]      
2020 $ 400,000   $ 500,000