Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 17,746	$ 17,089
Net unrealized holding gain (loss) on securities available for sale	5,251	(19,225)
Tax effect	(1,350)	4,974
Net unrealized gain (loss) on securities available for sale, net of tax	3,901	(14,251)
Amortization of net actuarial gain	(114)	(78)
Amortization of prior service cost (credit)	3	(280)
Tax effect	29	93
Amortization of net actuarial gain and prior service cost (credit) on pension and postretirement plans, net of tax	(82)	(265)
Other comprehensive income (loss), net of tax	3,819	(14,516)
Comprehensive income	$ 21,565	$ 2,573