Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Beginning Balance	$ 27,411
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM	(44,483)	$ 2,690	$ 3,448
Ending Balance	(385,476)	27,411
Unrealized Gains (Losses) on Investment Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Beginning Balance	40,441	81,604	14,864
Other comprehensive income (loss) before reclassifications	(312,169)	(17,948)	65,651
Amounts reclassified from AOCI gain (loss)	(20)	(25,905)	(2,359)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM	(44,483)	2,690	3,448
Ending Balance	(316,231)	40,441	81,604
Net Unrealized (Loss) Gain on Interest Rate Derivatives used in Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Beginning Balance	(4,817)	0	0
Other comprehensive income (loss) before reclassifications	(62,963)	0	0
Amounts reclassified from AOCI gain (loss)	6,004	(4,817)	0
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM	0	0	0
Ending Balance	(61,776)	(4,817)	0
Unrecognized Pension and Postretirement Plan Income (Costs)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Beginning Balance	(8,213)	(16,513)	(15,001)
Other comprehensive income (loss) before reclassifications	644	7,144	(2,532)
Amounts reclassified from AOCI gain (loss)	100	1,156	1,020
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM	0	0	0
Ending Balance	(7,469)	(8,213)	(16,513)
Accumulated Other Comprehensive (Loss) Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Beginning Balance	27,411	65,091	(137)
Other comprehensive income (loss) before reclassifications	(374,488)	(10,804)	63,119
Amounts reclassified from AOCI gain (loss)	6,084	(29,566)	(1,339)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM	(44,483)	2,690	3,448
Ending Balance	$ (385,476)	$ 27,411	$ 65,091

- 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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