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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | $ (11,622) | $ 5,933 | $ (27,704) | $ 14,926
Net current period other comprehensive (loss) income | (4,092) | 8,959 | 112,967 | 63,415
Unrealized Losses on Investment Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | 113,102 |  | 5,792 |
Net unrealized gains arising during period | 7,530 | 3,026 | 140,671 | 48,489
Amounts reclassified from accumulated other comprehensive loss | (16,497) | (874) | (42,328) | (5,278)
Net current period other comprehensive (loss) income | (8,967) | 2,152 | 98,343 | 43,211
Ending balance | 104,135 | 4,706 | 104,135 | 4,706
Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | 0 |  | 0 |
Net unrealized gains arising during period | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 0 | 4,693 | 0 | 13,863
Net current period other comprehensive (loss) income | 0 | 4,693 | 0 | 13,863
Ending balance | 0 | (57,286) | 0 | (57,286)
Defined Benefit Pension Items |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | (122,766) |  | (132,515) |
Net unrealized gains arising during period | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 4,875 | 2,114 | 14,624 | 6,341
Net current period other comprehensive (loss) income | 4,875 | 2,114 | 14,624 | 6,341
Ending balance | (117,891) | (119,192) | (117,891) | (119,192)
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | (9,664) |  | (126,723) |
Net unrealized gains arising during period | 7,530 | 3,026 | 140,671 | 48,489
Amounts reclassified from accumulated other comprehensive loss | (11,622) | 5,933 | (27,704) | 14,926
Net current period other comprehensive (loss) income | (4,092) | 8,959 | 112,967 | 63,415
Ending balance | $ (13,756) | (171,772) | $ (13,756) | (171,772)
Previously Reported | Unrealized Losses on Investment Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | 2,554 |  | (38,505)
Previously Reported | Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | (61,979) |  | (71,149)
Previously Reported | Defined Benefit Pension Items |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | (121,306) |  | (125,533)
Previously Reported | Accumulated Other Comprehensive (Loss) Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | $ (180,731) |  | $ (235,187)

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