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Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | $ 30 | $ 896 | $ 8,201 | $ 6,479
Other comprehensive income (loss), tax | (7) | (228) | (2,097) | (1,648)
Other Comprehensive Income | 23 | 668 | 6,104 | 4,831
Unrealized Gains and Losses on Available for Sale Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | (397) | 668 | 7,823 | 5,796
Other comprehensive income (loss), tax | 101 | (169) | (2,000) | (1,473)
Other Comprehensive Income | (296) | 499 | 5,823 | 4,323
Unrealized Loss on Cash Flow Swap |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | 317 |  | 48 |
Other comprehensive income (loss), tax | (79) |  | (11) |
Other Comprehensive Income | 238 | 0 | 37 | 0
Amortization of Net Retirement Plan Actuarial Gain (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | 57 | 172 | 171 | 514
Other comprehensive income (loss), tax | (15) | (45) | (44) | (133)
Other Comprehensive Income | 42 | 127 | 127 | 381
Amortization of Defined Benefit Pension, Prior-Service Costs |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | 53 | 56 | 159 | 169
Other comprehensive income (loss), tax | (14) | (14) | (42) | (42)
Other Comprehensive Income | $ 39 | $ 42 | $ 117 | $ 127

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