Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 25,272	$ 15,161
Unrealized (losses) gains on securities available for sale:
Unrealized holding (losses) gains arising during the period, pretax	(19,143)	35,333
Tax benefit (expense)	4,432	(7,425)
Reclassification to realized losses	975	0
Tax expense	(226)	0
Postretirement Plans:
Amortization of unrecognized net actuarial losses	25	44
Tax benefit	(6)	(11)
Other comprehensive (loss) income	(13,943)	27,941
Comprehensive income	$ 11,329	$ 43,102