Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	$ 291,828	$ 289,342	$ 271,316	$ 261,391	$ 289,342	$ 261,391
Other comprehensive income (loss) before reclassification	2,380		(3,582)		879	2,249
Amounts reclassified from accumulated other comprehensive income (loss)	33		56		(434)	991
Total other comprehensive income (loss), net of tax	2,413	(1,968)	(3,526)	6,766	445	3,240
Ending balance	296,663	291,828	274,297	271,316	296,663	274,297
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(30,799)	(28,831)	(30,938)	(37,704)	(28,831)	(37,704)
Total other comprehensive income (loss), net of tax	2,413	(1,968)	(3,526)	6,766
Ending balance	(28,386)	(30,799)	(34,464)	(30,938)	(28,386)	(34,464)
Unrealized gains (losses) on available for-sale securities
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(28,328)	(25,871)	(27,810)	(34,829)	(25,871)	(34,829)
Other comprehensive income (loss) before reclassification	2,152		(3,864)		195	1,988
Amounts reclassified from accumulated other comprehensive income (loss)	0		0		(500)	1,167
Total other comprehensive income (loss), net of tax	2,152		(3,864)		(305)	3,155
Ending balance	(26,176)	(28,328)	(31,674)	(27,810)	(26,176)	(31,674)
Defined benefit pension plan items
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(2,505)	(2,994)	(3,128)	(3,129)	(2,994)	(3,129)
Other comprehensive income (loss) before reclassification	228		282		684	261
Amounts reclassified from accumulated other comprehensive income (loss)	33		22		66	44
Total other comprehensive income (loss), net of tax	261		304		750	305
Ending balance	(2,244)	(2,505)	(2,824)	(3,128)	(2,244)	(2,824)
Investment hedge
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	34	34	0	254	34	254
Other comprehensive income (loss) before reclassification	0		0		0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0		34		0	(220)
Total other comprehensive income (loss), net of tax	0		34		0	(220)
Ending balance	$ 34	$ 34	$ 34	$ 0	$ 34	$ 34