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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (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] |  |  |  |
Beginning Balance |  |  | $ (54,724) | $ (180,709)
Net change in unrealized gain or loss | $ 425 | $ 34,159 | 217,254 | 160,627
Reclassification of net income or loss realized and included in earnings | (4,076) | 3,280 | (6,593) | 11,483
Valuation adjustment to employee benefit plans |  |  | (10,251) | (7,015)
Amortization of unrealized net loss (gain) on securities transferred to HTM | (89) | 954 | (378) | 2,435
Income tax expense | 48 | 7,331 | 46,370 | 37,977
Ending Balance | 98,938 | (51,156) | 98,938 | (51,156)
Equity Method Investment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (434) |
Net change in unrealized gain or loss |  |  | (4,935) | (434)
Ending Balance | (5,369) | (434) | (5,369) | (434)
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 28,950 | (50,125)
Net change in unrealized gain or loss |  |  | 176,009 | 125,589
Income tax expense |  |  | 39,817 | 28,395
Ending Balance | 165,142 | 47,069 | 165,142 | 47,069
Held to Maturity Securities Transferred from AFS [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 639 | (12,044)
Amortization of unrealized net loss (gain) on securities transferred to HTM |  |  | (378) | 2,435
Income tax expense |  |  | (85) | 551
Ending Balance | 346 | (10,160) | 346 | (10,160)
Employee Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (101,278) | (110,247)
Reclassification of net income or loss realized and included in earnings |  |  | 4,656 | 6,851
Valuation adjustment to employee benefit plans |  |  | (10,251) | (7,015)
Income tax expense |  |  | (1,265) | (37)
Ending Balance | (105,608) | (110,374) | (105,608) | (110,374)
Gains and Losses on Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 17,399 | (8,293)
Net change in unrealized gain or loss |  |  | 46,180 | 35,472
Reclassification of net income or loss realized and included in earnings |  |  | (11,249) | 4,632
Income tax expense |  |  | 7,903 | 9,068
Ending Balance | $ 44,427 | $ 22,743 | $ 44,427 | $ 22,743

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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