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Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | $ 21,425 | $ 1,136 | $ 54,972 | $ 6,855
Amounts reclassified from accumulated other comprehensive income, net of tax | (11,622) | 5,933 | (27,704) | 14,926
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | 1,457 | 631 | 4,370 | 1,894
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | (4,875) | (2,114) | (14,624) | (6,341)
Tax effect | 4,928 | 262 | 12,644 | 1,577
Unrealized Losses on Investment Securities Available for Sale |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 21,425 | 1,136 | 54,972 | 6,855
Amounts reclassified from accumulated other comprehensive income, net of tax | (16,497) | (874) | (42,328) | (5,278)
Tax effect | 4,928 | 262 | 12,644 | 1,577
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 16,497 | 874 | 42,328 | 5,278
Defined Benefit Pension Items |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of actuarial losses and prior service cost |  | (2,730) |  | (8,192)
Total before taxes | (6,332) | (2,745) | (18,994) | (8,235)
Amounts reclassified from accumulated other comprehensive income, net of tax | 4,875 | 2,114 | 14,624 | 6,341
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  | (15) |  | (43)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | 1,457 | 631 | 4,370 | 1,894
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | (4,875) | (2,114) | (14,624) | (6,341)
Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ 0 | 4,693 | $ 0 | 13,863
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Before Tax |  | (6,095) |  | (18,004)
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Tax |  | 1,402 |  | 4,141
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Net Of Tax |  | $ (4,693) |  | $ (13,863)

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