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Loans and Allowance - Amortized Cost Basis Of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021		Dec. 31, 2020		Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	$ 55,276
Allowance on Collateral Dependent Loans	201,082	[1]	$ 130,648	[1]	$ 99,454	$ 80,284
Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	2,202
Agricultural land, production and other loans to farmers
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	780
Commercial real estate, non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	45,188
Commercial real estate, owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	3,539
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	3,113
Allowance on Collateral Dependent Loans	0		0		17,364	14,569
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	452
Individuals' loans for household and other personal expenditures
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	2
Allowance on Collateral Dependent Loans	0		$ 0		$ 5,752	$ 4,035
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	49,507
Commercial Real Estate | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Commercial Real Estate | Agricultural land, production and other loans to farmers
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	780
Commercial Real Estate | Commercial real estate, non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	45,188
Commercial Real Estate | Commercial real estate, owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	3,539
Commercial Real Estate | Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Commercial Real Estate | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Commercial Real Estate | Individuals' loans for household and other personal expenditures
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	3,565
Residential Real Estate | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Residential Real Estate | Agricultural land, production and other loans to farmers
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Residential Real Estate | Commercial real estate, non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Residential Real Estate | Commercial real estate, owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Residential Real Estate | Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	3,113
Residential Real Estate | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	452
Residential Real Estate | Individuals' loans for household and other personal expenditures
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	2,204
Other | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	2,202
Other | Agricultural land, production and other loans to farmers
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Other | Commercial real estate, non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Other | Commercial real estate, owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Other | Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Other | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	0
Other | Individuals' loans for household and other personal expenditures
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	2
Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance on Collateral Dependent Loans	5,994
Collateral Dependent | Commercial and industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance on Collateral Dependent Loans	0
Collateral Dependent | Agricultural land, production and other loans to farmers
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance on Collateral Dependent Loans	0
Collateral Dependent | Commercial real estate, non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance on Collateral Dependent Loans	5,561
Collateral Dependent | Commercial real estate, owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance on Collateral Dependent Loans	0
Collateral Dependent | Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance on Collateral Dependent Loans	356
Collateral Dependent | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance on Collateral Dependent Loans	77
Collateral Dependent | Individuals' loans for household and other personal expenditures
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance on Collateral Dependent Loans	$ 0
[1] Beginning January 1, 2021, the calculation is based on the current expected credit loss methodology. Prior to January 1, 2021, the calculation is based on the incurred loss methodology. See additional details in NOTE 1. GENERAL of these Notes to Consolidated Condensed Financial Statement.

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