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
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 9,642	$ 7,682	$ 29,564	$ 22,019
Other comprehensive income (loss):
Unrealized holding gains (losses) on available for sale securities	(3,107)	948	(6,977)	9,386
Tax effect	652	(199)	1,465	(1,971)
Reclassification of gains recognized in net income	(4)	(92)	(2)	(92)
Tax effect		19		19
Pension liability adjustment	81	72	244	217
Tax effect	(17)	(15)	(51)	(46)
Total other comprehensive income (loss)	(2,395)	733	(5,321)	7,513
Comprehensive income	$ 7,247	$ 8,415	$ 24,243	$ 29,532