Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income		$ 205,122	$ 192,081	$ 239,502
Other comprehensive income (loss), net of tax
Net change in fair value of securities available for sale		42,761	16,743	32,426
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		8,353	6,713	16,055
Net change in other comprehensive income for defined benefit postretirement plans	[1]	(861)	1,364	(224)
Total other comprehensive income		50,253	24,820	48,257
Total comprehensive income		$ 255,375	$ 216,901	$ 287,759

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