Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net income		$ 81,838	$ 51,101	$ 161,757	$ 95,525
Other comprehensive income, net of tax
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax		(8,586)	9,835	(18,079)	26,229
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		(763)	2,329	(795)	5,785
Net change in other comprehensive income for defined benefit postretirement plans	[1]	(19)	(45)	(38)	(90)
Total other comprehensive (loss) income		(9,368)	12,119	(18,912)	31,924
Total comprehensive income		$ 72,470	$ 63,220	$ 142,845	$ 127,449

[1] The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 13 - Employee Benefit Plans within the Notes to the Consolidated Financial Statements included in Item 8 of the 2025 Form 10-K.