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Fair Value Disclosures - Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | $ 320,566 | $ 313,376
U.S. Government-sponsored agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 21,899 | 22,730
Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 254,900 | 243,406
State and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 39,122 | 39,474
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 4,645 | 7,766
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Total assets | 0 | 0
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities |  | 0
Fair Value, Measurements, Recurring | Level 1 | Customer loan interest swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Government-sponsored agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | State and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 320,566 | 313,376
Total assets | 323,157 | 316,016
Derivative liabilities | 2,591 | 8,882
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities |  | 6,242
Fair Value, Measurements, Recurring | Level 2 | Customer loan interest swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 2,591 | 2,640
Derivative liabilities | 2,591 | 2,640
Fair Value, Measurements, Recurring | Level 2 | U.S. Government-sponsored agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 21,899 | 22,730
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 254,900 | 243,406
Fair Value, Measurements, Recurring | Level 2 | State and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 39,122 | 39,474
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 4,645 | 7,766
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Total assets | 0 | 0
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities |  | 0
Fair Value, Measurements, Recurring | Level 3 | Customer loan interest swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Government-sponsored agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | State and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 0 | 0
Fair Value, Measurements, Recurring | Total Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 320,566 | 313,376
Total assets | 323,157 | 316,016
Derivative liabilities | 2,591 | 8,882
Fair Value, Measurements, Recurring | Total Fair Value | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities |  | 6,242
Fair Value, Measurements, Recurring | Total Fair Value | Customer loan interest swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 2,591 | 2,640
Derivative liabilities | 2,591 | 2,640
Fair Value, Measurements, Recurring | Total Fair Value | U.S. Government-sponsored agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 21,899 | 22,730
Fair Value, Measurements, Recurring | Total Fair Value | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 254,900 | 243,406
Fair Value, Measurements, Recurring | Total Fair Value | State and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | 39,122 | 39,474
Fair Value, Measurements, Recurring | Total Fair Value | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value (Estimated) | $ 4,645 | $ 7,766

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