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Other Comprehensive Income (Loss) - Changes in 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 (Loss), Net of Tax [Roll Forward]
Beginning Balances	$ 655,254	$ 663,558	$ 605,331	$ 558,393	$ 663,558	$ 558,393
Other Comprehensive Income (Loss) Before Reclassification	(8,103)		(18,330)		(27,970)	14,618
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	27,189		(30)		27,161	(32)
Total Other Comprehensive Income (Loss)	19,086	(19,895)	(18,360)	32,946	(809)	14,586
Ending Balances	687,821	655,254	602,565	605,331	687,821	602,565
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balances	(236,955)	(217,060)	(230,492)	(263,438)	(217,060)	(263,438)
Total Other Comprehensive Income (Loss)	19,086	(19,895)	(18,360)	32,946
Ending Balances	(217,869)	(236,955)	(248,852)	(230,492)	(217,869)	(248,852)
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balances	(236,441)	(216,546)	(229,978)	(262,924)	(216,546)	(262,924)
Other Comprehensive Income (Loss) Before Reclassification	(8,103)		(18,330)		(27,970)	14,618
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	27,189		(30)		27,161	(32)
Total Other Comprehensive Income (Loss)	19,086		(18,360)		(809)	14,586
Ending Balances	(217,355)	(236,441)	(248,338)	(229,978)	(217,355)	(248,338)
Postretirement Benefit Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balances	(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 Balances	$ (514)	$ (514)	$ (514)	$ (514)	$ (514)	$ (514)

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