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Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,695,162	$ 1,640,080	$ 1,690,596	$ 1,597,703
Current - period other comprehensive income (loss)	11,621	(14,347)	1,151	2,552
Ending balance	2,555,646	1,642,471	2,555,646	1,642,471
Accumulated Other Comprehensive (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(151,585)	(148,146)	(141,115)	(165,045)
Current - period other comprehensive income (loss)	11,621	(14,347)	1,151	2,552
Ending balance	(139,964)	(162,493)	(139,964)	(162,493)
Unrealized Losses on Available for Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(164,446)	(165,750)	(154,489)	(186,614)
Current - period other comprehensive income (loss)	13,617	(14,726)	3,660	6,138
Ending balance	(150,829)	(180,476)	(150,829)	(180,476)
Post- Retirement Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	3,108	1,303	3,937	1,572
Current - period other comprehensive income (loss)	(355)	(261)	(1,184)	(530)
Ending balance	2,753	1,042	2,753	1,042
Unrealized Gains on Derivatives (cash flow hedges)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	9,753	16,301	9,437	19,997
Current - period other comprehensive income (loss)	(1,641)	640	(1,325)	(3,056)
Ending balance	$ 8,112	$ 16,941	$ 8,112	$ 16,941

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

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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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