Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 587,668	$ 530,670	$ 549,041	$ 527,976
Balance	622,218	565,951	622,218	565,951
Unrealized gains and (Losses) on available- for-sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(113,761)	(125,561)	(127,807)	(118,000)
Change in Other comprehensive income (loss) before reclassification, Unrealized gains and Losses on available-for-sale Securities	19,614	31,705	33,658	24,145
Amount reclassified from accumulated other comprehensive income, unrealized gains and losses on available for-sale-Securities	(18)	(77)	(16)	(78)
Net current period other comprehensive income (loss)	19,596	31,628	33,642	24,067
Balance	(94,165)	(93,933)	(94,165)	(93,933)
Retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(4,473)	(8,940)	(4,478)	(9,087)
Amount reclassified from accumulated other comprehensive income, unrealized gains and losses on available for-sale-Securities	3	73	8	220
Net current period other comprehensive income (loss)	3	73	8	220
Balance	(4,470)	(8,867)	(4,470)	(8,867)
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(118,234)	(134,501)	(132,285)	(127,087)
Change in Other comprehensive income (loss) before reclassification, Unrealized gains and Losses on available-for-sale Securities	19,614	31,705	33,658	24,145
Amount reclassified from accumulated other comprehensive income, unrealized gains and losses on available for-sale-Securities	(15)	(4)	(8)	142
Net current period other comprehensive income (loss)	19,599	31,701	33,650	24,287
Balance	$ (98,635)	$ (102,800)	$ (98,635)	$ (102,800)