CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 66,555	$ 47,700	$ 35,299
Other comprehensive income (loss):
Change in net unrealized holding (losses) gains on available-for-sale securities and I/O strips	(19,079)	(2,953)	3,553
Deferred income taxes	5,532	1,177	(1,031)
Change in net unamortized unrealized gain on securities available-for- sale that were reclassified to securities held-to-maturity		(371)	(52)
Deferred income taxes		110	15
Reclassification adjustment for gains realized in income			(277)
Deferred income taxes			82
Change in unrealized (losses) gains on securities and I/O strips, net of deferred income taxes	(13,547)	(2,037)	2,290
Change in net pension and other benefit plan liability adjustment	9,909	2,219	(4,036)
Deferred income taxes	(2,222)	(461)	807
Change in pension and other benefit plan liability, net of deferred income taxes	7,687	1,758	(3,229)
Other comprehensive (loss)	(5,860)	(279)	(939)
Total comprehensive income	$ 60,695	$ 47,421	$ 34,360