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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  | $ 1,136 | $ 0 | $ 6,855 | $ 0
Amortization of actuarial losses and prior service cost |  | (2,730) | (3,476) | (8,192) | (10,427)
Total before taxes |  | (2,745) | (3,495) | (8,235) | (10,486)
Amounts reclassified from accumulated other comprehensive income, net of tax |  | 5,933 | 7,698 | 14,926 | 16,526
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  | (15) | (19) | (43) | (59)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | 631 | 804 | 1,894 | 2,412
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax |  | (2,114) | (2,691) | (6,341) | (8,074)
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) | (6,502) | (18,004) | (10,975)
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Tax |  | 1,402 | 1,495 | 4,141 | 2,523
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) | (5,007) | (13,863) | (8,452)
Tax effect |  | 262 | 0 | 1,577 | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 874 |  | 5,278 |
Unrealized Losses on Investment Securities Available for Sale |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] | (874) | 0 | (5,278) | 0
Defined Benefit Pension Items |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] | $ 2,114 | $ 2,691 | $ 6,341 | $ 8,074
[1] | All amounts are net of tax. Amounts in parentheses indicate debits.

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