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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.

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