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Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | $ 7,115 | $ 351 | $ 4,293
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | (1,636) | (81) | (1,588)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | 2,525 | 3,216 | $ 3,596
Amounts reclassified from accumulated other comprehensive income, net of tax | 18,292 | 23,667 |
Unrealized gains (losses) on 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 | 7,115 | 351 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | (1,636) | (81) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 5,479 | 270 |
Amounts reclassified from accumulated other comprehensive income, net of tax | (5,479) | (270) |
Unrealized losses on securities available for sale transferred from (to) held to maturity |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Before Tax | (19,889) | (17,106) |
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Tax | 4,574 | 3,934 |
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Net Of Tax | (15,315) | (13,172) |
Amounts reclassified from accumulated other comprehensive income, net of tax | 15,315 | 13,172 |
Defined Benefit Pension Items |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | (57) | (79) |
Reclassification adjustment for losses included in income before income taxes | (10,924) | (13,902) |
Total before taxes | 10,981 | 13,981 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | 2,525 | 3,216 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 8,456 | 10,765 |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ 8,456 | $ 10,765 |

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