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Fair Value - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details) - Individually Analyzed Loans - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Commercial and Industrial Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | $ 2,715 | $ 2,506
Commercial Real Estate Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 3,098 | 3,447
Agricultural Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 2,220 | 2,395
Consumer Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 9 | 9
Home Equity Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 326 | 326
Residential Mortgage Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 326 | 450
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial and Industrial Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Real Estate Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agricultural Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Home Equity Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential Mortgage Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Commercial and Industrial Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Commercial Real Estate Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Agricultural Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Consumer Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Home Equity Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Residential Mortgage Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Commercial and Industrial Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 2,715 | 2,506
Significant Unobservable Inputs (Level 3) | Commercial Real Estate Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 3,098 | 3,447
Significant Unobservable Inputs (Level 3) | Agricultural Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 2,220 | 2,395
Significant Unobservable Inputs (Level 3) | Consumer Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 9 | 9
Significant Unobservable Inputs (Level 3) | Home Equity Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | 326 | 326
Significant Unobservable Inputs (Level 3) | Residential Mortgage Loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets | $ 326 | $ 450

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