Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net Income	$ 94,761	$ 92,987
Other comprehensive (loss) income, net of tax:
Net unrealized holding (losses) gains	(21,683)	9,769
Reclassification adjustment for securities net change realized in net income	0	2
Amortization of net unrealized gains on AFS investment securities transferred to HTM	1,237	1,328
Net Unrealized (Losses) Gains on AFS Investment Securities	(20,446)	11,099
Net unrealized holding (losses) gains	(5,954)	1,764
Reclassification adjustment for net change realized in net income	3,300	3,515
Net Unrealized (Losses) Gains on Interest Rate Derivatives Used in Cash Flow Hedges	(2,654)	5,279
Amortization of net unrecognized pension and postretirement items	(105)	(106)
Other Comprehensive (Loss) Income, Net of Tax	(23,205)	16,272
Total Comprehensive Income	$ 71,556	$ 109,259