Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 145,723	$ 140,911	$ 182,836	$ 135,423
Net current period other comprehensive income/(loss)	(16,554)	(104)	(58,872)	(3,039)
Ending balance	136,190	180,603	136,190	180,603
Unrealized gains and losses on available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(43,780)	2,009	(1,072)	4,949
Other comprehensive income/(loss) before reclassification	(16,749)	(106)	(59,457)	(3,046)
Net current period other comprehensive income/(loss)	(16,749)	(106)	(59,457)	(3,046)
Ending balance	(60,529)	1,903	(60,529)	1,903
Amortization of defined benefit pension
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,110)	(3,266)	(2,506)	(3,277)
Other comprehensive income/(loss) before reclassification	206		618
Less amounts reclassified from accumulated other comprehensive income	8	5	24	16
Net current period other comprehensive income/(loss)	198	5	594	16
Ending balance	(1,912)	(3,261)	(1,912)	(3,261)
Deferred Compensation Liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	129	141	135	147
Other comprehensive income/(loss) before reclassification	(3)	(3)	(9)	(9)
Net current period other comprehensive income/(loss)	(3)	(3)	(9)	(9)
Ending balance	126	138	126	138
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(45,761)	(1,116)	(3,443)	1,819
Other comprehensive income/(loss) before reclassification	(16,546)	(109)	(58,848)	(3,055)
Less amounts reclassified from accumulated other comprehensive income	8	5	24	16
Net current period other comprehensive income/(loss)	(16,554)	(104)	(58,872)	(3,039)
Ending balance	$ (62,315)	$ (1,220)	$ (62,315)	$ (1,220)