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Shareholders' Equity and Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | $ 5,237,714 | $ 5,052,968 | $ 5,161,334 | $ 4,941,690 |
Net current period other comprehensive income (loss) | (51,188) | (28,056) | (164,097) | 109,273 |
Ending balance | 5,252,802 | 5,064,542 | 5,252,802 | 5,064,542 |
Accumulated other comprehensive income (loss) | 5,462 |  | 5,462 |  | $ (158,635)
Total |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | 45,726 | 202,970 | 158,635 | 65,641 |
Other comprehensive income (loss) before reclassifications | (47,474) | (28,441) | (157,937) | 167,082 |
Amounts reclassified from AOCI | (3,714) | 385 | (6,160) | (57,809) |
Net current period other comprehensive income (loss) | (51,188) | (28,056) | (164,097) | 109,273 |
Ending balance | (5,462) | 174,914 | (5,462) | 174,914 |
Net unrealized gains (losses) on investment securities available for sale |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | 19,301 | 134,245 | 105,669 | 83,666 |
Other comprehensive income (loss) before reclassifications | (41,437) | (21,806) | (129,280) | 86,678 |
Amounts reclassified from AOCI | (719) | 1,149 | 756 | (56,756) |
Net current period other comprehensive income (loss) | (42,156) | (20,657) | (128,524) | 29,922 |
Ending balance | (22,855) | 113,588 | (22,855) | 113,588 |
Net unrealized gains (losses) on investment securities available for sale | Valuation Allowance of Deferred Tax Assets |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) | 13,300 |  | 13,300 |  |
Net unrealized gains (losses) on cash flow hedges |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | 26,425 | 68,263 | 52,966 | (18,487) |
Other comprehensive income (loss) before reclassifications | (6,037) | (6,635) | (28,657) | 80,404 |
Amounts reclassified from AOCI | (2,995) | (764) | (6,916) | (1,053) |
Net current period other comprehensive income (loss) | (9,032) | (7,399) | (35,573) | 79,351 |
Ending balance | 17,393 | 60,864 | 17,393 | 60,864 |
Post-retirement unfunded health benefit |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | 0 | 462 | 0 | 462 |
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0 |
Amounts reclassified from AOCI | 0 | 0 | 0 | 0 |
Net current period other comprehensive income (loss) | 0 | 0 | 0 | 0 |
Ending balance | 0 | $ 462 | 0 | $ 462 |
Net unrealized losses on cash flow hedges | Valuation Allowance of Deferred Tax Assets |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) | $ 12,100 |  | $ 12,100 |  |

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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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