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Shareholders' Equity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Before-Tax Amount |  |  |
Unrealized gain (loss) on securities | $ (403,606) | $ (23,222) | $ 85,188
Reclassification adjustment for securities gains included in net income | (27) | (33,516) | (3,053)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity | (57,509) | 3,485 | 4,360
Net unrealized holding gains (loss) arising during the period on interest rate derivatives used in cash flow hedges | (81,400) | (3,452) |
Reclassification adjustment for net loss (gain) realized in net income on interest rate derivatives used in cash flow hedges | 7,761 | (2,776) |
Unrecognized pension and postretirement income (cost) | 825 | 9,147 | (3,242)
Amortization of net unrecognized pension and postretirement income | 128 | 1,480 | 1,311
Total Other Comprehensive Income (Loss) | (533,828) | (48,854) | 84,564
Tax Effect |  |  |
Unrealized gain (loss) on securities | 91,437 | 5,274 | (19,537)
Reclassification adjustment for securities gains included in net income | 7 | 7,611 | 694
Amortization of net unrealized losses on available for sale securities transferred to held to maturity | 13,026 | (795) | (912)
Net unrealized holding gains (loss) arising during the period on interest rate derivatives used in cash flow hedges | 18,437 | 782 |
Reclassification adjustment for net loss (gain) realized in net income on interest rate derivatives used in cash flow hedges | (1,757) | 629 |
Unrecognized pension and postretirement income (cost) | (181) | (2,003) | 710
Amortization of net unrecognized pension and postretirement income | (28) | (324) | (291)
Total Other Comprehensive Income (Loss) | 120,941 | 11,174 | (19,336)
Other Comprehensive Income/(Loss), net of tax: |  |  |
Unrealized gain (loss) on securities | (312,169) | (17,948) | 65,651
Reclassification adjustment for securities gains included in net income | (20) | (25,905) | (2,359)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity | (44,483) | 2,690 | 3,448
Net unrealized holding gains (losses) arising during the period | (62,963) | (2,670) | 0
Reclassification adjustment for net loss (gain) realized in net income on interest rate derivatives used in cash flow hedges | 6,004 | (2,147) | 0
Unrecognized pension and postretirement income (cost) | 644 | 7,144 | (2,532)
Amortization of net unrecognized pension and postretirement income | 100 | 1,156 | 1,020
Total Other Comprehensive Income (Loss) | $ (412,887) | (37,680) | $ 65,228
Accounting Standards Update 2019-04 |  |  |
Before-Tax Amount |  |  |
Amortization of net unrealized losses on available for sale securities transferred to held to maturity |  | $ 3,700 |

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