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Loans and Allowance - Amortized Cost Basis Of Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | $ 49,643 |  |  | $ 56,156 |  |  |  |
Allowance on Collateral Dependent Loans | 199,972 | [1] | $ 199,775 | 130,648 | [1] | $ 126,726 | $ 121,119 | $ 80,284
Commercial and industrial loans |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 17,450 |  |  |  |  |  |  |
Agricultural land, production and other loans to farmers |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 300 |  |  |  |  |  |  |
Construction |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 15 |  |  |  |  |  |  |
Allowance on Collateral Dependent Loans | 17,640 |  | $ 17,077 | 10,284 |  |  |  |
Commercial real estate, non-owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 26,703 |  |  |  |  |  |  |
Commercial real estate, owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 1,846 |  |  |  |  |  |  |
Residential |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 2,927 |  |  | 3,291 |  |  |  |
Allowance on Collateral Dependent Loans | 0 |  |  | $ 0 |  | $ 22,047 | $ 21,078 | $ 14,569
Home equity |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 402 |  |  |  |  |  |  |
Commercial Real Estate |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 28,549 |  |  |  |  |  |  |
Commercial Real Estate | Commercial and industrial loans |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Commercial Real Estate | Agricultural land, production and other loans to farmers |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Commercial Real Estate | Construction |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Commercial Real Estate | Commercial real estate, non-owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 26,703 |  |  |  |  |  |  |
Commercial Real Estate | Commercial real estate, owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 1,846 |  |  |  |  |  |  |
Commercial Real Estate | Residential |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Commercial Real Estate | Home equity |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Residential |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 3,344 |  |  |  |  |  |  |
Residential | Commercial and industrial loans |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Residential | Agricultural land, production and other loans to farmers |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Residential | Construction |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 15 |  |  |  |  |  |  |
Residential | Commercial real estate, non-owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Residential | Commercial real estate, owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Residential | Residential |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 2,927 |  |  |  |  |  |  |
Residential | Home equity |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 402 |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 17,750 |  |  |  |  |  |  |
Other | Commercial and industrial loans |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 17,450 |  |  |  |  |  |  |
Other | Agricultural land, production and other loans to farmers |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 300 |  |  |  |  |  |  |
Other | Construction |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Other | Commercial real estate, non-owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Other | Commercial real estate, owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Other | Residential |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Other | Home equity |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  |  |  |  |
Collateral Dependent |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance on Collateral Dependent Loans | 11,863 |  |  |  |  |  |  |
Collateral Dependent | Commercial and industrial loans |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance on Collateral Dependent Loans | 4,985 |  |  |  |  |  |  |
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 | Construction |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance on Collateral Dependent Loans | 1 |  |  |  |  |  |  |
Collateral Dependent | Commercial real estate, non-owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance on Collateral Dependent Loans | 6,463 |  |  |  |  |  |  |
Collateral Dependent | Commercial real estate, owner occupied |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance on Collateral Dependent Loans | 21 |  |  |  |  |  |  |
Collateral Dependent | Residential |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance on Collateral Dependent Loans | 327 |  |  |  |  |  |  |
Collateral Dependent | Home equity |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance on Collateral Dependent Loans | $ 66 |  |  |  |  |  |  |
[1] | Beginning January 1, 2021, the amount is based on the current expected credit loss methodology. Prior to January 1, 2021, the amount 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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