Shareholders' Equity - Change in AOCI Components Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	$ 1,611,611	$ 1,374,507	$ 1,286,832
Other Comprehensive Income (Loss)	(368,276)	(74,204)	38,934
Balance at End of Period	1,316,995	1,611,611	1,374,507
Unrealized Gains and Losses on Net Investment Securities \| Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(32,940)	51,495	8,359
Other Comprehensive Income (Loss) Before Reclassifications	(384,543)	(81,644)	43,163
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity	176,700
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)		(2,791)	(27)
Other Comprehensive Income (Loss)	(207,843)	(84,435)	43,136
Balance at End of Period	(240,783)	(32,940)	51,495
Unrealized Gains and Losses on Net Investment Securities \| Held-to-maturity Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	54	(423)	(715)
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity	(176,700)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	7,849	477	292
Other Comprehensive Income (Loss)	(168,851)	477	292
Balance at End of Period	(168,797)	54	(423)
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(33,496)	(43,250)	(38,756)
Other Comprehensive Income (Loss) Before Reclassifications	7,000	7,968	(6,017)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	1,418	1,786	1,523
Other Comprehensive Income (Loss)	8,418	9,754	(4,494)
Balance at End of Period	(25,078)	(33,496)	(43,250)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at Beginning of Period	(66,382)	7,822	(31,112)
Other Comprehensive Income (Loss) Before Reclassifications	(377,543)	(73,676)	37,146
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	9,267	(528)	1,788
Other Comprehensive Income (Loss)	(368,276)	(74,204)	38,934
Balance at End of Period	$ (434,658)	$ (66,382)	$ 7,822

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount of tax expense (benefit) on adjustment from accumulated other comprehensive income (loss) for amortization of gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from transfer to investment in debt security measured at amortized cost (held-to-maturity).

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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