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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ (53,935) | $ 80,069 | $ (54,724)
Net change in unrealized gain (loss) | (898,241) | (211,580) | 224,337
Reclassification of net gain (loss) realized and included in earnings | (5,947) | (15,485) | (10,983)
Valuation adjustments for employee benefit plans | (24,139) |  | (37,451)
Valuation Adjustments to Pension Plan attributable to VERIP and Curtailment |  | 59,606 |
Other valuation adjustments to employee benefit plans |  | (6,735) |
Amortization of unrealized net gain (loss) on securities transferred to held to maturity | 1,355 | (158) | (470)
Income tax (expense) benefit | (208,725) | (40,348) | 40,640
Ending Balance | (772,182) | (53,935) | 80,069
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 11,037 | 171,224 | 28,950
Net change in unrealized gain (loss) | (785,538) | (208,760) | 183,441
Reclassification of net gain (loss) realized and included in earnings | 1,707 | 2,166 |
Transfer of net unrealized loss from AFS to HTM securities portfolio | 15,405 |  |
Income tax (expense) benefit | 172,981 | 46,407 | (41,167)
Ending Balance | (584,408) | 11,037 | 171,224
Held to Maturity Securities Transferred from AFS [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 153 | 276 | 639
Transfer of net unrealized loss from AFS to HTM securities portfolio | (15,405) |  |
Amortization of unrealized net gain (loss) on securities transferred to held to maturity | 1,355 | (158) | (470)
Income tax (expense) benefit | 3,163 | 35 | 107
Ending Balance | (10,734) | 153 | 276
Employee Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (80,946) | (125,573) | (101,278)
Reclassification of net gain (loss) realized and included in earnings | 2,274 | 4,555 | 6,368
Valuation adjustments for employee benefit plans | (24,139) |  | (37,451)
Valuation Adjustments to Pension Plan attributable to VERIP and Curtailment |  | 59,606 |
Other valuation adjustments to employee benefit plans |  | (6,735) |
Income tax (expense) benefit | 4,859 | (12,799) | 6,788
Ending Balance | (97,952) | (80,946) | (125,573)
Gains and Losses on Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 16,284 | 39,511 | 17,399
Net change in unrealized gain (loss) | (113,171) | (3,258) | 45,831
Reclassification of net gain (loss) realized and included in earnings | (9,928) | (26,674) | (17,351)
Income tax (expense) benefit | 27,722 | 6,705 | (6,368)
Ending Balance | (79,093) | 16,284 | 39,511
Equity Method Investment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (463) | (5,369) | (434)
Net change in unrealized gain (loss) | 468 | 438 | (4,935)
Reclassification of net gain (loss) realized and included in earnings |  | 4,468 |
Ending Balance | $ 5 | $ (463) | $ (5,369)

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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 https://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 https://asc.fasb.org/extlink&oid=126968391&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 https://asc.fasb.org/extlink&oid=126734703&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 https://asc.fasb.org/extlink&oid=126968391&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 https://asc.fasb.org/extlink&oid=124501264&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 https://asc.fasb.org/extlink&oid=124501264&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 https://asc.fasb.org/extlink&oid=126968391&loc=d3e681-108580 + Details
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