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Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (AOCI)
Beginning balance			$ 261,084
Other comprehensive income (loss) before reclassification	$ (5,809)	$ (10,679)	(3,560)	$ (36,009)
Amounts reclassified from accumulated other comprehensive income (loss)	22	122	1,013	(362)
Net current period other comprehensive income (loss)	(5,787)	(10,557)	(2,547)	(36,371)
Ending balance	271,416		271,416
Unrealized gains (losses) on available for-sale securities
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(31,674)	(26,203)	(34,829)	147
Other comprehensive income (loss) before reclassification	(5,885)	(10,796)	(3,897)	(36,648)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	1,167	(498)
Net current period other comprehensive income (loss)	(5,885)	(10,796)	(2,730)	(37,146)
Ending balance	(37,559)	(36,999)	(37,559)	(36,999)
Defined benefit pension plan items
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(2,824)	(3,385)	(3,129)	(4,069)
Other comprehensive income (loss) before reclassification	76	117	337	639
Amounts reclassified from accumulated other comprehensive income (loss)	22	80	66	242
Net current period other comprehensive income (loss)	98	197	403	881
Ending balance	(2,726)	(3,188)	(2,726)	(3,188)
Investment hedge
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	34	168	254	316
Other comprehensive income (loss) before reclassification	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	42	(220)	(106)
Net current period other comprehensive income (loss)	0	42	(220)	(106)
Ending balance	34	210	34	210
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(34,464)	(29,420)	(37,704)	(3,606)
Ending balance	$ (40,251)	$ (39,977)	$ (40,251)	$ (39,977)

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