Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 94,975	$ 79,607	$ 156,916	$ 147,920
Other Comprehensive Income (Loss), net of tax:
Net unrealized holding gains (losses)	(14,199)	(31,219)	(30,864)	1,422
Reclassification adjustment for securities net change realized in net income	15,688	(3)	15,688	14
Amortization of net unrealized gains on AFS securities transferred to HTM	1,403	1,501	2,790	2,979
Net unrealized gains (losses) on AFS investment securities	2,892	(29,721)	(12,386)	4,415
Net unrealized holding gains (losses)	2,256	(5,586)	6,553	(12,406)
Reclassification adjustment for net change realized in net income	3,891	7,010	7,790	14,153
Net unrealized gains on interest rate derivatives used in cash flow hedges	6,147	1,424	14,343	1,747
Amortization of net unrecognized pension and postretirement items	(105)	3	(211)	28
Other Comprehensive Income (Loss), net of tax	8,934	(28,294)	1,746	6,190
Total Comprehensive Income	$ 103,909	$ 51,313	$ 158,662	$ 154,110