Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income		$ 192,081	$ 239,502	$ 263,813
Other comprehensive income (loss), net of tax
Net change in fair value of securities available for sale		16,743	32,426	(118,990)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		6,713	16,055	(50,767)
Net change in other comprehensive income for defined benefit postretirement plans	[1]	1,364	(224)	4,490
Total other comprehensive income (loss)		24,820	48,257	(165,267)
Total comprehensive income		$ 216,901	$ 287,759	$ 98,546

[1] The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 12 - Employee Benefit Plans within the Notes to the Consolidated Financial Statements in Item 8.