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Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 687,821	$ 655,254	$ 663,558	$ 602,565	$ 605,331	$ 558,393	$ 663,558	$ 558,393
Other Comprehensive Income (Loss) Before Reclassification	42,775			(78,761)			14,914	(64,143)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	55			0			27,107	(32)
Total Other Comprehensive Income (Loss)	42,830	19,086	(19,895)	(78,761)	(18,360)	32,946	42,021	(64,175)
Ending balance	744,563	687,821	655,254	538,392	602,565	605,331	744,563	538,392
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(217,869)	(236,955)	(217,060)	(248,852)	(230,492)	(263,438)	(217,060)	(263,438)
Total Other Comprehensive Income (Loss)	42,830	19,086	(19,895)	(78,761)	(18,360)	32,946
Ending balance	(175,039)	(217,869)	(236,955)	(327,613)	(248,852)	(230,492)	(175,039)	(327,613)
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(217,355)		(216,546)	(248,338)		(262,924)	(216,546)	(262,924)
Other Comprehensive Income (Loss) Before Reclassification	42,775			(78,761)			14,914	(64,143)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	55			0			27,107	(32)
Total Other Comprehensive Income (Loss)	42,830			(78,761)			42,021	(64,175)
Ending balance	(174,525)	(217,355)		(327,099)	(248,338)		(174,525)	(327,099)
Postretirement Benefit Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(514)		$ (514)	(514)		$ (514)	(514)	(514)
Other Comprehensive Income (Loss) Before Reclassification	0			0			0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0			0			0	0
Total Other Comprehensive Income (Loss)	0			0			0	0
Ending balance	$ (514)	$ (514)		$ (514)	$ (514)		$ (514)	$ (514)

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