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Other Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss) | $ 8,135 | $ 10,935 | $ (3,653)
Available for sale securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | 12,494 | 13,732 | (5,073)
Reclassifications | (2,190) | (148) | 0
Net unrealized gain (loss) | 10,304 | 13,584 | (5,073)
Tax effect | (2,164) | (2,852) | 1,066
Total other comprehensive income (loss) | 8,140 | 10,732 | (4,007)
Unrealized gain (loss) on postretirement benefits plan |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | 277 | 518 | 404
Reclassifications | 0 | 23 | 84
Net unrealized gain (loss) | 277 | 541 | 488
Tax effect | (58) | (113) | (102)
Total other comprehensive income (loss) | 219 | 428 | 386
Unrealized loss on interest rate swap |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Before reclassifications | (508) | (347) | (204)
Reclassifications | 224 | 63 | 164
Net unrealized gain (loss) | (284) | (284) | (40)
Tax effect | 60 | 59 | 8
Total other comprehensive income (loss) | $ (224) | $ (225) | $ (32)

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