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Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Before-Tax Amount |  |  |  |
Other Comprehensive Income | $ 896 | $ (1,095) | $ 6,479 | $ (5,063)
Tax (Expense) Benefit |  |  |  |
Other Comprehensive Income | (228) | 278 | (1,648) | 1,287
Net of Tax Amount |  |  |  |
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period | 499 | (897) | 4,323 | (4,017)
Amortization of Net Retirement Plan | 169 | 80 | 508 | 241
Other Comprehensive Loss | 668 | (817) | 4,831 | (3,776)
Unrealized Gains and Losses on Available for Sale Securities |  |  |  |
Before-Tax Amount |  |  |  |
Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period | 668 | (1,203) | 5,796 | (5,388)
Tax (Expense) Benefit |  |  |  |
Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period | (169) | 306 | (1,473) | 1,371
Net of Tax Amount |  |  |  |
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period | 499 | (897) | 4,323 | (4,017)
Amortization of Net Retirement Plan |  | 0 | 0 | 0
Amortization of Net Retirement Plan Actuarial Gain (Loss) |  |  |  |
Before-Tax Amount |  |  |  |
Amortization of Net Retirement Plan | 172 | 81 | 514 | 244
Tax (Expense) Benefit |  |  |  |
Amortization of Net Retirement Plan | (45) | (21) | (133) | (63)
Net of Tax Amount |  |  |  |
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period | 0 | 0 | 0 | 0
Amortization of Net Retirement Plan | 127 | 60 | 381 | 181
Accumulated Defined Benefit Plans Adjustment, Net Prior Service |  |  |  |
Before-Tax Amount |  |  |  |
Amortization of Net Retirement Plan | 56 | 27 | 169 | 81
Tax (Expense) Benefit |  |  |  |
Amortization of Net Retirement Plan | (14) | (7) | (42) | (21)
Net of Tax Amount |  |  |  |
Amortization of Net Retirement Plan | $ 42 | $ 20 | $ 127 | $ 60

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