Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 16,762	$ 14,071	$ 45,278	$ 38,638
Net unrealized holding (loss) gain on securities available for sale	(765)	(267)	(5,939)	11,392
Reclassification adjustments for net gain recognized in income	0	0	0	(1,155)
Tax effect	199	69	1,534	(2,660)
Net unrealized (loss) gain on securities available for sale, net of tax	(566)	(198)	(4,405)	7,577
Amortization of net actuarial gain	(137)	(222)	(534)	(531)
Amortization of prior service cost (credit)	177	(49)	227	(147)
Tax effect	(10)	70	80	177
Amortization of net actuarial gain and prior service cost (credit) on pension and postretirement plans, net of tax	30	(201)	(227)	(501)
Other comprehensive (loss) income, net of tax	(536)	(399)	(4,632)	7,076
Comprehensive income	$ 16,226	$ 13,672	$ 40,646	$ 45,714