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Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Before-Tax Amount |  |
Other Comprehensive Income | $ 5,300 | $ 3,007
Tax (Expense) Benefit |  |
Other Comprehensive Income | (1,355) | (764)
Net of Tax Amount |  |
Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period | 3,879 | 2,080
Amortization of Net Retirement Plan | 66 | 163
Other Comprehensive Income | 3,945 | 2,243
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 | 5,504 | 2,788
Tax (Expense) Benefit |  |
Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period | (1,406) | (708)
Net of Tax Amount |  |
Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period | 4,098 | 2,080
Amortization of Net Retirement Plan | 0 | 0
Unrealized Loss on Cash Flow Swap |  |
Before-Tax Amount |  |
Net Unrealized Losses on Cash Flow Swap | (294) |
Tax (Expense) Benefit |  |
Net Unrealized Losses on Cash Flow Swap | 75 |
Net of Tax Amount |  |
Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period | (219) |
Net Unrealized Losses on Cash Flow Swap | (219) |
Amortization of Net Retirement Plan | 0 |
Amortization of Net Retirement Plan Actuarial Gain (Loss) |  |
Before-Tax Amount |  |
Amortization of Net Retirement Plan | 36 | 163
Tax (Expense) Benefit |  |
Amortization of Net Retirement Plan | (9) | (42)
Net of Tax Amount |  |
Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period | 0 | 0
Amortization of Net Retirement Plan | 27 | 121
Accumulated Defined Benefit Plans Adjustment, Net Prior Service |  |
Before-Tax Amount |  |
Amortization of Net Retirement Plan | 54 | 56
Tax (Expense) Benefit |  |
Amortization of Net Retirement Plan | (15) | (14)
Net of Tax Amount |  |
Amortization of Net Retirement Plan | $ 39 | $ 42

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