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Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Unrealized gains and losses on available for sale securities reclassified from AOCI before tax |  | $ 12,529 | $ 147 | $ 17,157 | $ 5,273
Securities gains (losses) |  | 12,529 | 147 | 17,157 | 5,273
Amortization of actuarial losses and prior service cost |  | (1,830) | (2,835) | (3,430) | (5,668)
Total before taxes |  | (1,882) | (2,887) | (3,534) | (5,773)
Amounts reclassified from accumulated other comprehensive income, net of tax |  | (6,573) | 1,691 | (8,411) | 305
Unrealized gains and losses on available for sale securities reclassified from AOCI tax |  | (4,793) | (74) | (6,563) | (2,051)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 7,736 | 73 | 10,594 | 3,222
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax |  | (52) | (52) | (104) | (105)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  | 719 | 1,123 | 1,351 | 2,246
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax |  | (1,163) | (1,764) | (2,183) | (3,527)
Unrealized Loss on Cash Flow Hedges |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] | 0 | 0 | 0 | 0
Unrealized Gains 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] | (7,736) | (73) | (10,594) | (3,222)
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] | $ 1,163 | $ 1,764 | $ 2,183 | $ 3,527
[1] | All amounts are net of tax.

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