Comprehensive Income (Loss), Net of Tax - Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 353,538	$ 371,186	$ 334,392
Other comprehensive income (loss) before reclassifications	8,897	(50,364)	1,016
Amounts reclassified from accumulated other comprehensive income (loss)	7,342	362	147
Other Comprehensive Income (Loss)	16,239	(50,002)	1,163
Ending balance	379,772	353,538	371,186
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(49,655)	347	(816)
Other Comprehensive Income (Loss)	16,239	(50,002)	1,163
Ending balance	(33,416)	(49,655)	347
Unrealized Gains And Losses On Available-for-Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(48,841)	(614)	5,799
Other comprehensive income (loss) before reclassifications	10,441	(48,227)	(6,413)
Amounts reclassified from accumulated other comprehensive income (loss)	6,752	0	0
Other Comprehensive Income (Loss)	17,193	(48,227)	(6,413)
Ending balance	(31,648)	(48,841)	(614)
Unrealized Gain on Cash Flow Swap
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	4,054	1,320	485
Other comprehensive income (loss) before reclassifications	(2,900)	2,582	929
Amounts reclassified from accumulated other comprehensive income (loss)	557	152	(94)
Other Comprehensive Income (Loss)	(2,343)	2,734	835
Ending balance	1,711	4,054	1,320
Net Actuarial Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(4,467)	639	(5,929)
Other comprehensive income (loss) before reclassifications	1,747	(5,147)	6,500
Amounts reclassified from accumulated other comprehensive income (loss)	(119)	41	68
Other Comprehensive Income (Loss)	1,628	(5,106)	6,568
Ending balance	(2,839)	(4,467)	639
Amortization of Net Retirement Plan Prior Service Cost
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(401)	(998)	(1,171)
Other comprehensive income (loss) before reclassifications	(391)	428	0
Amounts reclassified from accumulated other comprehensive income (loss)	152	169	173
Other Comprehensive Income (Loss)	(239)	597	173
Ending balance	$ (640)	$ (401)	$ (998)