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Accumulated Other Comrehensive Loss (Components of AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Amounts reclassified from accumulated other comprehensive loss | $ 18,292 | $ 23,667 |
Net current period other comprehensive income (loss) | 108,464 | (62,842) | $ 12,898
Unrealized gains (losses) on securities available for sale |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Stockholders' equity | (38,505) | (60,696) |
Net unrealized gains (losses) arising during period | 49,776 | 22,461 |
Amounts reclassified from accumulated other comprehensive loss | (5,479) | (270) |
Net current period other comprehensive income (loss) | 44,297 | 22,191 |
Stockholders' equity | 5,792 | (38,505) | (60,696)
Unrealized losses on securities available for sale transferred from (to) held to maturity |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Stockholders' equity | (71,149) | 0 |
Net unrealized gains (losses) arising during period | 55,834 | (84,321) |
Amounts reclassified from accumulated other comprehensive loss | 15,315 | 13,172 |
Net current period other comprehensive income (loss) | 71,149 | (71,149) |
Stockholders' equity | 0 | (71,149) | 0
Defined Benefit Pension Items |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Stockholders' equity | (125,533) | (111,649) |
Net unrealized gains (losses) arising during period | (15,438) | (24,649) |
Amounts reclassified from accumulated other comprehensive loss | 8,456 | 10,765 |
Net current period other comprehensive income (loss) | (6,982) | (13,884) |
Stockholders' equity | (132,515) | (125,533) | (111,649)
Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Stockholders' equity | (235,187) | (172,345) |
Net unrealized gains (losses) arising during period | 90,172 | (86,509) |
Amounts reclassified from accumulated other comprehensive loss | 18,292 | 23,667 |
Net current period other comprehensive income (loss) | 108,464 | (62,842) | 12,898
Stockholders' equity | $ (126,723) | (235,187) | (172,345)
Pre-adoption | Unrealized gains (losses) on securities available for sale |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Stockholders' equity |  | (30,945) |
Stockholders' equity |  |  | (30,945)
Pre-adoption | Unrealized losses on securities available for sale transferred from (to) held to maturity |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Stockholders' equity |  | 0 |
Stockholders' equity |  |  | 0
Pre-adoption | Defined Benefit Pension Items |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Stockholders' equity |  | (91,349) |
Stockholders' equity |  |  | (91,349)
Pre-adoption | Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Stockholders' equity |  | $ (122,294) |
Stockholders' equity |  |  | (122,294)
Effect of adoption |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Cumulative effect adjustments |  |  | (50,051)
Effect of adoption | Unrealized gains (losses) on securities available for sale |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Cumulative effect adjustments |  |  | (29,751)
Effect of adoption | Unrealized losses on securities available for sale transferred from (to) held to maturity |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Cumulative effect adjustments |  |  | 0
Effect of adoption | Defined Benefit Pension Items |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Cumulative effect adjustments |  |  | $ (20,300)

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