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Accumulated Other Comprehensive Income Changes in 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] |  |  |  |
Unrealized gain on securities, before tax amount | $ 5,565 | $ 23,150 | $ 72,146 | $ 81,207
Unrealized gain on securities, tax effect | (1,232) | (5,121) | (15,960) | (17,963)
Unrealized gain on securities, net of tax amount | 4,333 | 18,029 | 56,186 | 63,244
Reclassification adjustment for securities gains included in net income, before tax amount | (2) | (4,492) | (3,053) | (4,733)
Reclassification adjustment for securities gains included in net income, tax effect | 1 | 994 | 676 | 1,047
Reclassification adjustment for securities gains included in net income, net of tax amount | (1) | (3,498) | (2,377) | (3,686)
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To-Maturity, Before Tax | 1,192 | 4,405 | 3,232 | 6,966
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To-Maturity, Tax | (264) | (974) | (715) | (1,541)
Other Comprehensive Income (Loss), Reclassification Adjustment From AOCI For Amortization Of Unrealized Losses On Investments Transferred From Available-For-Sale To Held-To Maturity, After Tax | 928 | 3,430 | 2,517 | 5,425
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, before tax amount |  |  |  | (875)
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, tax effect |  |  |  | 193
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, net of tax amount | 0 | 0 | 0 | (682)
Amortization of net unrecognized pension and postretirement items, before tax amount | 329 | 357 | 984 | 1,083
Amortization of net unrecognized pension and postretirement items, tax effect | (73) | (80) | (219) | (240)
Amortization of net unrecognized pension and postretirement items, net of tax amount | 255 | 277 | 765 | 843
Total Other Comprehensive Income, Before Tax Amount | 7,083 | 23,419 | 73,309 | 83,648
Total Other Comprehensive Income, Tax Effect | (1,568) | (5,181) | (16,218) | (18,504)
Other Comprehensive Income | $ 5,515 | $ 18,238 | $ 57,091 | 65,144
Accounting Standards Update 2019-04 |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Transfers From Available-For-Sale To Held-To-Maturity Securities, Before Tax |  |  |  | $ 3,700

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