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Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | $ 309,224 | $ 313,376 | $ 340,140
U.S. Government-sponsored agencies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 21,939 | 22,730 | 27,497
Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 247,253 | 243,406 | 276,424
State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 35,179 | 39,474 | 36,219
Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 4,853 | 7,766 |
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 0 | 0 | 0
Derivative assets | 0 |  |
Total assets | 0 | 0 | 0
Derivative liabilities | 0 | 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 assets | 0 |  |
Derivative liabilities | 0 | 0 | 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 assets | 0 | 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] |  |  |
Securities available for sale | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 0 | 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] |  |  |
Securities available for sale | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 309,224 | 313,376 | 340,140
Derivative assets | 3,307 |  |
Total assets | 312,531 | 316,016 | 343,451
Derivative liabilities | 5,252 | 8,882 | 10,653
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap agreements |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets | 644 |  |
Derivative liabilities | 2,589 | 6,242 | 7,342
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 assets | 2,663 | 2,640 | 3,311
Derivative liabilities | 2,663 | 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] |  |  |
Securities available for sale | 21,939 | 22,730 | 27,497
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 247,253 | 243,406 | 276,424
Fair Value, Measurements, Recurring | Level 2 | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 35,179 | 39,474 | 36,219
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 4,853 | 7,766 |
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 0 | 0 | 0
Derivative assets | 0 |  |
Total assets | 0 | 0 | 0
Derivative liabilities | 0 | 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 assets | 0 |  |
Derivative liabilities | 0 | 0 | 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 assets | 0 | 0 | 0
Derivative liabilities | 0 | 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] |  |  |
Securities available for sale | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 0 | 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] |  |  |
Securities available for sale | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Total Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 309,224 | 313,376 | 340,140
Derivative assets | 3,307 |  |
Total assets | 312,531 | 316,016 | 343,451
Derivative liabilities | 5,252 | 8,882 | 10,653
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 assets | 644 |  |
Derivative liabilities | 2,589 | 6,242 | 7,342
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 assets | 2,663 | 2,640 | 3,311
Derivative liabilities | 2,663 | 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] |  |  |
Securities available for sale | 21,939 | 22,730 | 27,497
Fair Value, Measurements, Recurring | Total Fair Value | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 247,253 | 243,406 | 276,424
Fair Value, Measurements, Recurring | Total Fair Value | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 35,179 | 39,474 | $ 36,219
Fair Value, Measurements, Recurring | Total Fair Value | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | $ 4,853 | $ 7,766 |

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