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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Impaired financing receivable, recorded investment $ 148,500,000   $ 148,500,000    
Commitments to purchase or sell 0 $ 0 0 $ 0  
Proceeds from sale of loans held-for-investment 0 $ 0 $ 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:
September 30, 2021
Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral20212020201920182017PriorRevolving Loans Amortized Cost BasisTotal
Commercial real estate non-owner occupied:
Pass$408.9 $467.7 $258.9 $160.7 $94.9 $426.9 $11.6 $1,829.6 
Special mention0.2 1.5 2.2 — — 13.9 — 17.8 
Substandard3.9 15.5 2.4 0.8 1.1 13.1 — 36.8 
Total$413.0 $484.7 $263.5 $161.5 $96.0 $453.9 $11.6 $1,884.2 
Commercial real estate owner occupied:
Pass$317.5 $325.0 $247.5 $166.0 $106.2 $368.1 $12.7 $1,543.0 
Special mention1.1 5.3 1.9 5.1 3.1 18.6 — 35.1 
Substandard3.5 5.0 5.8 8.4 2.8 23.0 0.1 48.6 
Total$322.1 $335.3 $255.2 $179.5 $112.1 $409.7 $12.8 $1,626.7 
Commercial multi-family:
Pass$62.7 $116.3 $46.3 $20.6 $36.9 $87.6 $1.9 $372.3 
Total$62.7 $116.3 $46.3 $20.6 $36.9 $87.6 $1.9 $372.3 
Land, acquisition and development:
Pass$80.2 $73.7 $42.6 $15.7 $21.0 $21.9 $2.0 $257.1 
Special mention1.0 0.2 — — 0.1 — — 1.3 
Substandard0.6 0.2 — 0.7 0.1 0.1 0.1 1.8 
Total$81.8 $74.1 $42.6 $16.4 $21.2 $22.0 $2.1 $260.2 
Residential construction:
Pass$98.2 $23.8 $26.5 $1.0 $1.6 $— $116.3 $267.4 
Special mention— — — — 0.4 — — 0.4 
Substandard0.2 0.4 — — — — — 0.6 
Total$98.4 $24.2 $26.5 $1.0 $2.0 $— $116.3 $268.4 
Commercial construction:
Pass$207.7 $221.2 $147.4 $27.7 $0.6 $5.6 $— $610.2 
Total$207.7 $221.2 $147.4 $27.7 $0.6 $5.6 $— $610.2 
September 30, 2021
Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral20212020201920182017PriorRevolving Loans Amortized Cost BasisTotal
Agricultural real estate:
Pass$52.8 $39.9 $37.3 $24.2 $13.4 $31.2 $3.8 $202.6 
Special mention0.1 1.5 1.2 0.6 0.1 3.6 1.0 8.1 
Substandard1.0 1.7 6.7 2.7 1.3 3.4 — 16.8 
Doubtful2.4 — — — — — — 2.4 
Total$56.3 $43.1 $45.2 $27.5 $14.8 $38.2 $4.8 $229.9 
Commercial and floor plans:
Pass$509.2 $182.7 $107.8 $90.6 $50.9 $101.2 $246.3 $1,288.7 
Special mention0.8 12.7 0.9 2.1 3.6 3.1 3.9 27.1 
Substandard2.2 2.8 1.6 2.0 0.7 4.9 1.1 15.3 
Total$512.2 $198.2 $110.3 $94.7 $55.2 $109.2 $251.3 $1,331.1 
Commercial purpose secured by 1-4 family:
Pass$66.2 $67.3 $30.6 $24.6 $16.4 $36.4 $13.7 $255.2 
Special mention— 0.2 0.2 0.5 0.1 0.8 0.4 2.2 
Substandard1.2 1.4 0.7 1.0 0.2 1.6 0.1 6.2 
Total$67.4 $68.9 $31.5 $26.1 $16.7 $38.8 $14.2 $263.6 
Agricultural:
Pass$30.3 $27.1 $10.5 $7.8 $3.5 $2.0 $108.0 $189.2 
Special mention0.9 0.6 0.5 0.3 — 0.3 3.1 5.7 
Substandard9.6 0.8 1.4 2.6 0.1 0.2 1.3 16.0 
Total$40.8 $28.5 $12.4 $10.7 $3.6 $2.5 $112.4 $210.9 

December 31, 2020
Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral20202019201820172016PriorRevolving Loans Amortized Cost BasisTotal
Commercial real estate non-owner occupied:
Pass$495.9 $304.9 $216.0 $105.3 $139.7 $336.5 $13.8 $1,612.1 
Special mention0.3 2.3 0.9 0.1 6.4 13.7 — 23.7 
Substandard15.7 2.7 1.0 4.1 1.1 13.9 — 38.5 
Doubtful— — 0.2 — — — — 0.2 
Total$511.9 $309.9 $218.1 $109.5 $147.2 $364.1 $13.8 $1,674.5 
Commercial real estate owner occupied:
Pass$416.3 $312.5 $211.2 $122.4 $153.7 $357.9 $8.9 $1,582.9 
Special mention7.1 9.6 4.8 3.1 18.6 20.0 — 63.2 
Substandard8.9 6.5 11.5 5.0 15.1 11.1 0.3 58.4 
Doubtful0.2 — — 0.2 — 0.1 — 0.5 
Total$432.5 $328.6 $227.5 $130.7 $187.4 $389.1 $9.2 $1,705.0 
Commercial multi-family:
Pass$132.5 $58.9 $23.5 $41.6 $25.8 $80.5 $0.8 $363.6 
Special mention— — — — — 0.1 — 0.1 
Total$132.5 $58.9 $23.5 $41.6 $25.8 $80.6 $0.8 $363.7 
December 31, 2020
Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral20202019201820172016PriorRevolving Loans Amortized Cost BasisTotal
Land, acquisition and development:
Pass$104.6 $58.8 $26.4 $30.7 $7.6 $26.3 $5.8 $260.2 
Special mention0.2 0.1 — 0.9 — 1.2 0.5 2.9 
Substandard0.3 — 1.2 0.1 — 0.1 0.1 1.8 
Doubtful— — — — — 0.1 — 0.1 
Total$105.1 $58.9 $27.6 $31.7 $7.6 $27.7 $6.4 $265.0 
Residential construction:
Pass$80.4 $64.7 $16.7 $5.6 $— $0.1 $82.1 $249.6 
Substandard0.2 — — — — — 1.1 1.3 
Total$80.6 $64.7 $16.7 $5.6 $— $0.1 $83.2 $250.9 
Commercial construction:
Pass$236.1 $195.4 $61.2 $11.9 $6.0 $(0.3)$11.6 $521.9 
Special mention— — 1.5 — — — — 1.5 
Substandard— — — — — 0.1 — 0.1 
Total$236.1 $195.4 $62.7 $11.9 $6.0 $(0.2)$11.6 $523.5 
Agricultural real estate:
Pass$50.0 $45.3 $28.2 $17.2 $12.7 $27.2 $5.3 $185.9 
Special mention2.8 6.7 1.0 1.5 0.9 1.0 0.5 14.4 
Substandard1.4 5.9 3.4 0.9 3.4 4.4 0.6 20.0 
Doubtful— 0.3 — — — — — 0.3 
Total$54.2 $58.2 $32.6 $19.6 $17.0 $32.6 $6.4 $220.6 
Commercial and floor plans:
Pass$1,029.4 $153.0 $136.0 $69.8 $43.0 $92.3 $233.1 $1,756.6 
Special mention5.6 1.0 1.9 7.0 3.9 0.5 2.4 22.3 
Substandard8.8 1.8 4.3 0.4 4.1 1.1 11.5 32.0 
Doubtful0.3 0.4 — — 0.1 2.6 0.2 3.6 
Total$1,044.1 $156.2 $142.2 $77.2 $51.1 $96.5 $247.2 $1,814.5 
Commercial purpose secured by 1-4 family:
Pass$82.3 $53.7 $33.7 $20.7 $15.5 $34.9 $17.5 $258.3 
Special mention0.5 0.5 0.3 0.1 0.5 0.8 0.8 3.5 
Substandard2.4 1.0 4.8 0.3 1.4 1.0 0.1 11.0 
Total$85.2 $55.2 $38.8 $21.1 $17.4 $36.7 $18.4 $272.8 
Agricultural:
Pass$47.4 $18.1 $10.7 $4.2 $3.0 $1.3 $130.9 $215.6 
Special mention1.5 0.7 0.4 — 0.1 0.3 13.4 16.4 
Substandard3.7 1.5 4.2 0.6 0.1 0.4 3.6 14.1 
Total$52.6 $20.3 $15.3 $4.8 $3.2 $2.0 $147.9 $246.1 
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:
September 30, 2021
Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral20212020201920182017PriorRevolving Loans Amortized Cost BasisTotal
Residential 1-4 family:
Performing$324.5 $490.7 $79.4 $35.0 $30.5 $199.2 $— $1,159.3 
Nonperforming— 0.9 0.4 — 0.4 1.9 — 3.6 
Total$324.5 $491.6 $79.8 $35.0 $30.9 $201.1 $— $1,162.9 
Consumer home equity and HELOC:
Performing$11.8 $8.1 $4.7 $5.2 $4.0 $13.2 $343.1 $390.1 
Nonperforming0.3 — 0.3 — 0.6 0.7 — 1.9 
Total$12.1 $8.1 $5.0 $5.2 $4.6 $13.9 $343.1 $392.0 
Consumer indirect:
Performing$223.5 $236.0 $124.6 $74.6 $44.1 $52.2 $— $755.0 
Nonperforming0.1 0.4 0.3 0.3 0.2 0.5 — 1.8 
Total$223.6 $236.4 $124.9 $74.9 $44.3 $52.7 $— $756.8 
Consumer direct and advance line:
Performing$34.9 $31.5 $17.9 $16.2 $6.8 $8.8 $16.5 $132.6 
Nonperforming— — 0.1 0.1 0.1 — — 0.3 
Total$34.9 $31.5 $18.0 $16.3 $6.9 $8.8 $16.5 $132.9 
The following table presents the recorded investment in credit card loans based on payment activity for the periods indicated:
As of September 30, 2021ConsumerCommercialAgriculturalTotal
Credit Card:
Performing$63.7 $73.9 $1.5 $139.1 
Nonperforming0.4 0.1 — 0.5 
Total$64.1 $74.0 $1.5 $139.6 
As of December 31, 2020ConsumerCommercialAgriculturalTotal
Credit Card:
Performing$69.6 $66.3 $1.5 $137.4 
Nonperforming0.6 0.3 — 0.9 
Total credit card$70.2 $66.6 $1.5 $138.3 
    
Non-owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 413,000,000.0   $ 413,000,000.0   $ 511,900,000
2019 484,700,000   484,700,000   309,900,000
2018 263,500,000   263,500,000   218,100,000
2017 161,500,000   161,500,000   109,500,000
2016 96,000,000.0   96,000,000.0   147,200,000
Prior 453,900,000   453,900,000   364,100,000
Revolving Loans Amortized Cost Basis 11,600,000   11,600,000   13,800,000
Total 1,884,200,000   1,884,200,000   1,674,500,000
Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Loans held for investment 3,883,200,000   3,883,200,000   3,743,200,000
Land acquisition & development          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 81,800,000   81,800,000   105,100,000
2019 74,100,000   74,100,000   58,900,000
2018 42,600,000   42,600,000   27,600,000
2017 16,400,000   16,400,000   31,700,000
2016 21,200,000   21,200,000   7,600,000
Prior 22,000,000.0   22,000,000.0   27,700,000
Revolving Loans Amortized Cost Basis 2,100,000   2,100,000   6,400,000
Total 260,200,000   260,200,000   265,000,000.0
Loans held for investment 260,200,000   260,200,000   265,000,000.0
Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 98,400,000   98,400,000   80,600,000
2019 24,200,000   24,200,000   64,700,000
2018 26,500,000   26,500,000   16,700,000
2017 1,000,000.0   1,000,000.0   5,600,000
2016 2,000,000.0   2,000,000.0   0
Prior 0   0   100,000
Revolving Loans Amortized Cost Basis 116,300,000   116,300,000   83,200,000
Total 268,400,000   268,400,000   250,900,000
Loans held for investment 268,400,000   268,400,000   250,900,000
Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 207,700,000   207,700,000   236,100,000
2019 221,200,000   221,200,000   195,400,000
2018 147,400,000   147,400,000   62,700,000
2017 27,700,000   27,700,000   11,900,000
2016 600,000   600,000   6,000,000.0
Prior 5,600,000   5,600,000   200,000
Revolving Loans Amortized Cost Basis 0   0   11,600,000
Total 610,200,000   610,200,000   523,500,000
Loans held for investment 610,200,000   610,200,000   523,500,000
Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Loans held for investment 1,554,900,000   1,554,900,000   1,396,300,000
Total construction loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Loans held for investment 1,138,800,000   1,138,800,000   1,039,400,000
Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 56,300,000   56,300,000   54,200,000
2019 43,100,000   43,100,000   58,200,000
2018 45,200,000   45,200,000   32,600,000
2017 27,500,000   27,500,000   19,600,000
2016 14,800,000   14,800,000   17,000,000.0
Prior 38,200,000   38,200,000   32,600,000
Revolving Loans Amortized Cost Basis 4,800,000   4,800,000   6,400,000
Total 229,900,000   229,900,000   220,600,000
Loans held for investment 229,900,000   229,900,000   220,600,000
Total real estate loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Loans held for investment 6,806,800,000   6,806,800,000   6,399,500,000
Indirect consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 223,600,000   223,600,000   334,600,000
2019 236,400,000   236,400,000   188,100,000
2018 124,900,000   124,900,000   118,000,000.0
2017 74,900,000   74,900,000   74,000,000.0
2016 44,300,000   44,300,000   47,700,000
Prior 52,700,000   52,700,000   42,700,000
Revolving Loans Amortized Cost Basis 0   0   0
Total 756,800,000   756,800,000   805,100,000
Loans held for investment 756,800,000   756,800,000   805,100,000
Direct consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 34,900,000   34,900,000   47,200,000
2019 31,500,000   31,500,000   29,400,000
2018 18,000,000.0   18,000,000.0   28,200,000
2017 16,300,000   16,300,000   11,900,000
2016 6,900,000   6,900,000   5,300,000
Prior 8,800,000   8,800,000   8,600,000
Revolving Loans Amortized Cost Basis 16,500,000   16,500,000   20,000,000.0
Total 132,900,000   132,900,000   150,600,000
Loans held for investment 132,900,000   132,900,000   150,600,000
Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 139.6   139.6   138.3
Loans held for investment 64,100,000   64,100,000   70,200,000
Total consumer loans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Loans held for investment 953,800,000   953,800,000   1,025,900,000
Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
Loans held for investment 1,668,700,000   1,668,700,000   2,153,900,000
Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020         52,600,000
2019         20,300,000
2018         15,300,000
2017         4,800,000
2016         3,200,000
Prior         2,000,000.0
Revolving Loans Amortized Cost Basis         147,900,000
Total         246,100,000
Loans held for investment 212,400,000   212,400,000   247,600,000
Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 322,100,000   322,100,000   432,500,000
2019 335,300,000   335,300,000   328,600,000
2018 255,200,000   255,200,000   227,500,000
2017 179,500,000   179,500,000   130,700,000
2016 112,100,000   112,100,000   187,400,000
Prior 409,700,000   409,700,000   389,100,000
Revolving Loans Amortized Cost Basis 12,800,000   12,800,000   9,200,000
Total 1,626,700,000   1,626,700,000   1,705,000,000
Multi-family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 62,700,000   62,700,000   132,500,000
2019 116,300,000   116,300,000   58,900,000
2018 46,300,000   46,300,000   23,500,000
2017 20,600,000   20,600,000   41,600,000
2016 36,900,000   36,900,000   25,800,000
Prior 87,600,000   87,600,000   80,600,000
Revolving Loans Amortized Cost Basis 1,900,000   1,900,000   800,000
Total 372,300,000   372,300,000   363,700,000
Commercial and floor plans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 512,200,000   512,200,000   1,044,100,000
2019 198,200,000   198,200,000   156,200,000
2018 110,300,000   110,300,000   142,200,000
2017 94,700,000   94,700,000   77,200,000
2016 55,200,000   55,200,000   51,100,000
Prior 109,200,000   109,200,000   96,500,000
Revolving Loans Amortized Cost Basis 251,300,000   251,300,000   247,200,000
Total 1,331,100,000   1,331,100,000   1,814,500,000
Commercial purpose secured by 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 67,400,000   67,400,000   85,200,000
2019 68,900,000   68,900,000   55,200,000
2018 31,500,000   31,500,000   38,800,000
2017 26,100,000   26,100,000   21,100,000
2016 16,700,000   16,700,000   17,400,000
Prior 38,800,000   38,800,000   36,700,000
Revolving Loans Amortized Cost Basis 14,200,000   14,200,000   18,400,000
Total 263,600,000   263,600,000   272,800,000
Agriculture Portfolio Segment [Member]          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 40,800,000   40,800,000    
2019 28,500,000   28,500,000    
2018 12,400,000   12,400,000    
2017 10,700,000   10,700,000    
2016 3,600,000   3,600,000    
Prior 2,500,000   2,500,000    
Revolving Loans Amortized Cost Basis 112,400,000   112,400,000    
Total 210,900,000   210,900,000    
Residential 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 324,500,000   324,500,000   491,200,000
2019 491,600,000   491,600,000   114,600,000
2018 79,800,000   79,800,000   57,200,000
2017 35,000,000.0   35,000,000.0   47,800,000
2016 30,900,000   30,900,000   65,700,000
Prior 201,100,000   201,100,000   235,800,000
Revolving Loans Amortized Cost Basis 0   0   0
Total 1,162,900,000   1,162,900,000   1,012,300,000
Consumer Home Equity and HELOC          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 12,100,000   12,100,000   12,100,000
2019 8,100,000   8,100,000   7,300,000
2018 5,000,000.0   5,000,000.0   7,100,000
2017 5,200,000   5,200,000   9,700,000
2016 4,600,000   4,600,000   4,800,000
Prior 13,900,000   13,900,000   14,800,000
Revolving Loans Amortized Cost Basis 343,100,000   343,100,000   328,200,000
Total 392,000,000.0   392,000,000.0   384,000,000.0
Pass | Non-owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 408,900,000   408,900,000   495,900,000
2019 467,700,000   467,700,000   304,900,000
2018 258,900,000   258,900,000   216,000,000.0
2017 160,700,000   160,700,000   105,300,000
2016 94,900,000   94,900,000   139,700,000
Prior 426,900,000   426,900,000   336,500,000
Revolving Loans Amortized Cost Basis 11,600,000   11,600,000   13,800,000
Total 1,829,600,000   1,829,600,000   1,612,100,000
Pass | Land acquisition & development          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 80,200,000   80,200,000   104,600,000
2019 73,700,000   73,700,000   58,800,000
2018 42,600,000   42,600,000   26,400,000
2017 15,700,000   15,700,000   30,700,000
2016 21,000,000.0   21,000,000.0   7,600,000
Prior 21,900,000   21,900,000   26,300,000
Revolving Loans Amortized Cost Basis 2,000,000.0   2,000,000.0   5,800,000
Total 257,100,000   257,100,000   260,200,000
Pass | Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 98,200,000   98,200,000   80,400,000
2019 23,800,000   23,800,000   64,700,000
2018 26,500,000   26,500,000   16,700,000
2017 1,000,000.0   1,000,000.0   5,600,000
2016 1,600,000   1,600,000   0
Prior 0   0   100,000
Revolving Loans Amortized Cost Basis 116,300,000   116,300,000   82,100,000
Total 267,400,000   267,400,000   249,600,000
Pass | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 207,700,000   207,700,000   236,100,000
2019 221,200,000   221,200,000   195,400,000
2018 147,400,000   147,400,000   61,200,000
2017 27,700,000   27,700,000   11,900,000
2016 600,000   600,000   6,000,000.0
Prior 5,600,000   5,600,000   300,000
Revolving Loans Amortized Cost Basis 0   0   11,600,000
Total 610,200,000   610,200,000   521,900,000
Pass | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 52,800,000   52,800,000   50,000,000.0
2019 39,900,000   39,900,000   45,300,000
2018 37,300,000   37,300,000   28,200,000
2017 24,200,000   24,200,000   17,200,000
2016 13,400,000   13,400,000   12,700,000
Prior 31,200,000   31,200,000   27,200,000
Revolving Loans Amortized Cost Basis 3,800,000   3,800,000   5,300,000
Total 202,600,000   202,600,000   185,900,000
Pass | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020         47,400,000
2019         18,100,000
2018         10,700,000
2017         4,200,000
2016         3,000,000.0
Prior         1,300,000
Revolving Loans Amortized Cost Basis         130,900,000
Total         215,600,000
Pass | Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 317,500,000   317,500,000   416,300,000
2019 325,000,000.0   325,000,000.0   312,500,000
2018 247,500,000   247,500,000   211,200,000
2017 166,000,000.0   166,000,000.0   122,400,000
2016 106,200,000   106,200,000   153,700,000
Prior 368,100,000   368,100,000   357,900,000
Revolving Loans Amortized Cost Basis 12,700,000   12,700,000   8,900,000
Total 1,543,000,000   1,543,000,000   1,582,900,000
Pass | Multi-family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 62,700,000   62,700,000   132,500,000
2019 116,300,000   116,300,000   58,900,000
2018 46,300,000   46,300,000   23,500,000
2017 20,600,000   20,600,000   41,600,000
2016 36,900,000   36,900,000   25,800,000
Prior 87,600,000   87,600,000   80,500,000
Revolving Loans Amortized Cost Basis 1,900,000   1,900,000   800,000
Total 372,300,000   372,300,000   363,600,000
Pass | Commercial and floor plans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 509,200,000   509,200,000   1,029,400,000
2019 182,700,000   182,700,000   153,000,000.0
2018 107,800,000   107,800,000   136,000,000.0
2017 90,600,000   90,600,000   69,800,000
2016 50,900,000   50,900,000   43,000,000.0
Prior 101,200,000   101,200,000   92,300,000
Revolving Loans Amortized Cost Basis 246,300,000   246,300,000   233,100,000
Total 1,288,700,000   1,288,700,000   1,756,600,000
Pass | Commercial purpose secured by 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 66,200,000   66,200,000   82,300,000
2019 67,300,000   67,300,000   53,700,000
2018 30,600,000   30,600,000   33,700,000
2017 24,600,000   24,600,000   20,700,000
2016 16,400,000   16,400,000   15,500,000
Prior 36,400,000   36,400,000   34,900,000
Revolving Loans Amortized Cost Basis 13,700,000   13,700,000   17,500,000
Total 255,200,000   255,200,000   258,300,000
Pass | Agriculture Portfolio Segment [Member]          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 30,300,000   30,300,000    
2019 27,100,000   27,100,000    
2018 10,500,000   10,500,000    
2017 7,800,000   7,800,000    
2016 3,500,000   3,500,000    
Prior 2,000,000.0   2,000,000.0    
Revolving Loans Amortized Cost Basis 108,000,000.0   108,000,000.0    
Total 189,200,000   189,200,000    
Other Assets Especially Mentioned | Non-owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 200,000   200,000   300,000
2019 1,500,000   1,500,000   2,300,000
2018 2,200,000   2,200,000   900,000
2017 0   0   100,000
2016 0   0   6,400,000
Prior 13,900,000   13,900,000   13,700,000
Revolving Loans Amortized Cost Basis 0   0   0
Total 17,800,000   17,800,000   23,700,000
Other Assets Especially Mentioned | Land acquisition & development          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 1,000,000.0   1,000,000.0   200,000
2019 200,000   200,000   100,000
2018 0   0   0
2017 0   0   900,000
2016 100,000   100,000   0
Prior 0   0   1,200,000
Revolving Loans Amortized Cost Basis 0   0   500,000
Total 1,300,000   1,300,000   2,900,000
Other Assets Especially Mentioned | Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 0   0    
2019 0   0    
2018 0   0    
2017 0   0    
2016 400,000   400,000    
Prior 0   0    
Revolving Loans Amortized Cost Basis 0   0    
Total 400,000   400,000    
Other Assets Especially Mentioned | Commercial          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020         0
2019         0
2018         1,500,000
2017         0
2016         0
Prior         0
Revolving Loans Amortized Cost Basis         0
Total         1,500,000
Other Assets Especially Mentioned | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 100,000   100,000   2,800,000
2019 1,500,000   1,500,000   6,700,000
2018 1,200,000   1,200,000   1,000,000.0
2017 600,000   600,000   1,500,000
2016 100,000   100,000   900,000
Prior 3,600,000   3,600,000   1,000,000.0
Revolving Loans Amortized Cost Basis 1,000,000.0   1,000,000.0   500,000
Total 8,100,000   8,100,000   14,400,000
Other Assets Especially Mentioned | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020         1,500,000
2019         700,000
2018         400,000
2017         0
2016         100,000
Prior         300,000
Revolving Loans Amortized Cost Basis         13,400,000
Total         16,400,000
Other Assets Especially Mentioned | Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 1,100,000   1,100,000   7,100,000
2019 5,300,000   5,300,000   9,600,000
2018 1,900,000   1,900,000   4,800,000
2017 5,100,000   5,100,000   3,100,000
2016 3,100,000   3,100,000   18,600,000
Prior 18,600,000   18,600,000   20,000,000.0
Revolving Loans Amortized Cost Basis 0   0   0
Total 35,100,000   35,100,000   63,200,000
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 800,000   800,000   5,600,000
2019 12,700,000   12,700,000   1,000,000.0
2018 900,000   900,000   1,900,000
2017 2,100,000   2,100,000   7,000,000.0
2016 3,600,000   3,600,000   3,900,000
Prior 3,100,000   3,100,000   500,000
Revolving Loans Amortized Cost Basis 3,900,000   3,900,000   2,400,000
Total 27,100,000   27,100,000   22,300,000
Other Assets Especially Mentioned | Commercial purpose secured by 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 0   0   500,000
2019 200,000   200,000   500,000
2018 200,000   200,000   300,000
2017 500,000   500,000   100,000
2016 100,000   100,000   500,000
Prior 800,000   800,000   800,000
Revolving Loans Amortized Cost Basis 400,000   400,000   800,000
Total 2,200,000   2,200,000   3,500,000
Other Assets Especially Mentioned | Agriculture Portfolio Segment [Member]          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 900,000   900,000    
2019 600,000   600,000    
2018 500,000   500,000    
2017 300,000   300,000    
2016 0   0    
Prior 300,000   300,000    
Revolving Loans Amortized Cost Basis 3,100,000   3,100,000    
Total 5,700,000   5,700,000    
Substandard | Non-owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 3,900,000   3,900,000   15,700,000
2019 15,500,000   15,500,000   2,700,000
2018 2,400,000   2,400,000   1,000,000.0
2017 800,000   800,000   4,100,000
2016 1,100,000   1,100,000   1,100,000
Prior 13,100,000   13,100,000   13,900,000
Revolving Loans Amortized Cost Basis 0   0   0
Total 36,800,000   36,800,000   38,500,000
Substandard | Land acquisition & development          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 600,000   600,000   300,000
2019 200,000   200,000   0
2018 0   0   1,200,000
2017 700,000   700,000   100,000
2016 100,000   100,000   0
Prior 100,000   100,000   100,000
Revolving Loans Amortized Cost Basis 100,000   100,000   100,000
Total 1,800,000   1,800,000   1,800,000
Substandard | Residential          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 200,000   200,000   200,000
2019 400,000   400,000   0
2018 0   0   0
2017 0   0   0
2016 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   1,100,000
Total 600,000   600,000   1,300,000
Substandard | Commercial          
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
Substandard | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 1,000,000.0   1,000,000.0   1,400,000
2019 1,700,000   1,700,000   5,900,000
2018 6,700,000   6,700,000   3,400,000
2017 2,700,000   2,700,000   900,000
2016 1,300,000   1,300,000   3,400,000
Prior 3,400,000   3,400,000   4,400,000
Revolving Loans Amortized Cost Basis 0   0   600,000
Total 16,800,000   16,800,000   20,000,000.0
Substandard | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020         3,700,000
2019         1,500,000
2018         4,200,000
2017         600,000
2016         100,000
Prior         400,000
Revolving Loans Amortized Cost Basis         3,600,000
Total         14,100,000
Substandard | Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 3,500,000   3,500,000   8,900,000
2019 5,000,000.0   5,000,000.0   6,500,000
2018 5,800,000   5,800,000   11,500,000
2017 8,400,000   8,400,000   5,000,000.0
2016 2,800,000   2,800,000   15,100,000
Prior 23,000,000.0   23,000,000.0   11,100,000
Revolving Loans Amortized Cost Basis 100,000   100,000   300,000
Total 48,600,000   48,600,000   58,400,000
Substandard | Commercial and floor plans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 2,200,000   2,200,000   8,800,000
2019 2,800,000   2,800,000   1,800,000
2018 1,600,000   1,600,000   4,300,000
2017 2,000,000.0   2,000,000.0   400,000
2016 700,000   700,000   4,100,000
Prior 4,900,000   4,900,000   1,100,000
Revolving Loans Amortized Cost Basis 1,100,000   1,100,000   11,500,000
Total 15,300,000   15,300,000   32,000,000.0
Substandard | Commercial purpose secured by 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 1,200,000   1,200,000   2,400,000
2019 1,400,000   1,400,000   1,000,000.0
2018 700,000   700,000   4,800,000
2017 1,000,000.0   1,000,000.0   300,000
2016 200,000   200,000   1,400,000
Prior 1,600,000   1,600,000   1,000,000.0
Revolving Loans Amortized Cost Basis 100,000   100,000   100,000
Total 6,200,000   6,200,000   11,000,000.0
Substandard | Agriculture Portfolio Segment [Member]          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 9,600,000   9,600,000    
2019 800,000   800,000    
2018 1,400,000   1,400,000    
2017 2,600,000   2,600,000    
2016 100,000   100,000    
Prior 200,000   200,000    
Revolving Loans Amortized Cost Basis 1,300,000   1,300,000    
Total 16,000,000.0   16,000,000.0    
Doubtful | Non-owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020         0
2019         0
2018         200,000
2017         0
2016         0
Prior         0
Revolving Loans Amortized Cost Basis         0
Total         200,000
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         100,000
Revolving Loans Amortized Cost Basis         0
Total         100,000
Doubtful | Agricultural          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 2,400,000   2,400,000   0
2019 0   0   300,000
2018 0   0   0
2017 0   0   0
2016 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Total 2,400,000   2,400,000   300,000
Doubtful | Owner occupied          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020         200,000
2019         0
2018         0
2017         200,000
2016         0
Prior         100,000
Revolving Loans Amortized Cost Basis         0
Total         500,000
Doubtful | Commercial and floor plans          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020         300,000
2019         400,000
2018         0
2017         0
2016         100,000
Prior         2,600,000
Revolving Loans Amortized Cost Basis         200,000
Total         3,600,000
Performing | Indirect consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 223,500,000   223,500,000   334,500,000
2019 236,000,000.0   236,000,000.0   187,900,000
2018 124,600,000   124,600,000   117,900,000
2017 74,600,000   74,600,000   73,800,000
2016 44,100,000   44,100,000   47,600,000
Prior 52,200,000   52,200,000   42,600,000
Revolving Loans Amortized Cost Basis 0   0   0
Total 755,000,000.0   755,000,000.0   804,300,000
Performing | Direct consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 34,900,000   34,900,000   47,100,000
2019 31,500,000   31,500,000   29,400,000
2018 17,900,000   17,900,000   28,100,000
2017 16,200,000   16,200,000   11,900,000
2016 6,800,000   6,800,000   5,300,000
Prior 8,800,000   8,800,000   8,600,000
Revolving Loans Amortized Cost Basis 16,500,000   16,500,000   19,900,000
Total 132,600,000   132,600,000   150,300,000
Performing | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 139.1   139.1   137.4
Performing | Residential 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 324,500,000   324,500,000   491,100,000
2019 490,700,000   490,700,000   113,900,000
2018 79,400,000   79,400,000   57,200,000
2017 35,000,000.0   35,000,000.0   47,800,000
2016 30,500,000   30,500,000   65,700,000
Prior 199,200,000   199,200,000   234,600,000
Revolving Loans Amortized Cost Basis 0   0   0
Total 1,159,300,000   1,159,300,000   1,010,300,000
Performing | Consumer Home Equity and HELOC          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 11,800,000   11,800,000   12,000,000.0
2019 8,100,000   8,100,000   7,100,000
2018 4,700,000   4,700,000   7,100,000
2017 5,200,000   5,200,000   9,700,000
2016 4,000,000.0   4,000,000.0   4,700,000
Prior 13,200,000   13,200,000   14,400,000
Revolving Loans Amortized Cost Basis 343,100,000   343,100,000   328,100,000
Total 390,100,000   390,100,000   383,100,000
Nonperforming | Indirect consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 100,000   100,000   100,000
2019 400,000   400,000   200,000
2018 300,000   300,000   100,000
2017 300,000   300,000   200,000
2016 200,000   200,000   100,000
Prior 500,000   500,000   100,000
Revolving Loans Amortized Cost Basis 0   0   0
Total 1,800,000   1,800,000   800,000
Nonperforming | Direct consumer          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 0   0   100,000
2019 0   0   0
2018 100,000   100,000   100,000
2017 100,000   100,000   0
2016 100,000   100,000   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   100,000
Total 300,000   300,000   300,000
Nonperforming | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 0.5   0.5   0.9
Nonperforming | Residential 1-4 family          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 0   0   100,000
2019 900,000   900,000   700,000
2018 400,000   400,000   0
2017 0   0   0
2016 400,000   400,000   0
Prior 1,900,000   1,900,000   1,200,000
Revolving Loans Amortized Cost Basis 0   0   0
Total 3,600,000   3,600,000   2,000,000.0
Nonperforming | Consumer Home Equity and HELOC          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 300,000   300,000   100,000
2019 0   0   200,000
2018 300,000   300,000   0
2017 0   0   0
2016 600,000   600,000   100,000
Prior 700,000   700,000   400,000
Revolving Loans Amortized Cost Basis 0   0   100,000
Total 1,900,000   1,900,000   900,000
Agriculture Portfolio Segment [Member] | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 1.5   1.5   1.5
Agriculture Portfolio Segment [Member] | Performing | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 1.5   1.5   1.5
Agriculture Portfolio Segment [Member] | Nonperforming | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 0   0   0
Commercial | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 74.0   74.0   66.6
Commercial | Performing | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 73.9   73.9   66.3
Commercial | Nonperforming | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 0.1   0.1   0.3
Total consumer loans | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 64.1   64.1   70.2
Total consumer loans | Performing | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 63.7   63.7   69.6
Total consumer loans | Nonperforming | Credit card          
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]          
2020 $ 0.4   $ 0.4   $ 0.6