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Stockholders' Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | $ (53,935) | $ 80,069
Net change in unrealized gain or loss | (390,904) | (145,490)
Reclassification of net income or loss realized and included in earnings | (3,838) | 286
Amortization of unrealized net gain or loss on securities transferred to HTM | 261 | (56)
Income tax expense (benefit) | (89,140) | (33,748)
Ending Balance | (359,276) | (31,443)
Accumulated Other Comprehensive Loss Available for Sale Securities [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | 11,037 | 171,224
Net change in unrealized gain or loss | (358,190) | (141,800)
Reclassification of net income or loss realized and included in earnings | 1,707 |
Transfer of net unrealized loss from AFS to HTM securities portfolio | 15,405 |
Income tax expense (benefit) | (76,981) | (31,862)
Ending Balance | (253,060) | 61,286
Held to Maturity Securities Transferred from AFS [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | 153 | 276
Transfer of net unrealized loss from AFS to HTM securities portfolio | (15,405) |
Amortization of unrealized net gain or loss on securities transferred to HTM | 261 | (56)
Income tax expense (benefit) | (3,418) | (13)
Ending Balance | (11,573) | 233
Employee Benefit Plans [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (80,946) | (125,573)
Reclassification of net income or loss realized and included in earnings | 1,209 | 1,954
Income tax expense (benefit) | 273 | 439
Ending Balance | (80,010) | (124,058)
Gains and Losses on Cash Flow Hedges [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | 16,284 | 39,511
Net change in unrealized gain or loss | (33,182) | (4,152)
Reclassification of net income or loss realized and included in earnings | (6,754) | (6,136)
Income tax expense (benefit) | (9,014) | (2,312)
Ending Balance | (14,638) | 31,535
Equity Method Investment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (463) | (5,369)
Net change in unrealized gain or loss | 468 | 462
Reclassification of net income or loss realized and included in earnings |  | 4,468
Ending Balance | $ 5 | $ (439)

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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=124509347&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=124509347&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=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 http://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 http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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