Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period			$ (25,288)				$ (25,288)
Change in unrealized holding losses on available-for-sale securities	$ (17,178)			$ (3,732)			(69,082)	$ (9,808)
Pension and other postretirement plans, OCI	1,731			3,463			5,198	10,389
Other comprehensive (loss) income	(15,447)	$ (23,248)	(25,189)	(269)	$ 6,139	$ (5,289)	(63,884)	581
AOCI (loss), end of period	(89,172)						(89,172)
Investment securities:
Accumulated other comprehensive income (loss), before tax
AOCI (loss), beginning of period	(57,980)		7,722	21,693		29,384	7,722	29,384
OCI (loss) before reclassifications	(26,524)			(2,557)			(96,982)	(8,282)
Realized investment losses (gains)	4,606			(2,189)			9,108	(4,069)
Impairment losses	175			23			429	(63)
Investment securities, OCI (loss)	(21,743)			(4,723)			(87,445)	(12,414)
AOCI (loss), end of period	(79,723)	(57,980)		16,970	21,693		(79,723)	16,970
Accumulated other comprehensive income (loss), tax
AOCI (loss), beginning of period	(12,177)		1,621	4,556		6,171	1,621	6,171
OCI (loss) before reclassifications	(5,570)			(537)			(20,366)	(1,739)
Realized investment losses (gains)	968			(459)			1,913	(854)
Impairment losses	37			5			90	(13)
Investment securities, OCI (loss)	(4,565)			(991)			(18,363)	(2,606)
AOCI (loss), end of period	(16,742)	(12,177)		3,565	4,556		(16,742)	3,565
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	(45,803)		6,101	17,137		23,213	6,101	23,213
OCI (loss) before reclassifications	(20,954)			(2,020)			(76,616)	(6,543)
Realized investment losses (gains)	3,638			(1,730)			7,195	(3,215)
Impairment losses	138			18			339	(50)
Change in unrealized holding losses on available-for-sale securities	(17,178)			(3,732)			(69,082)	(9,808)
AOCI (loss), end of period	(62,981)	(45,803)		13,405	17,137		(62,981)	13,405
Pension and other postretirement plans:
Accumulated other comprehensive income (loss), before tax
AOCI (loss), beginning of period	(35,346)		(39,734)	(119,533)		(128,300)	(39,734)	(128,300)
Amortization of prior service costs	361			357			1,082	1,071
Amortization of net actuarial loss	1,830			4,027			5,497	12,080
Pension and other postretirement plans, OCI	2,191			4,384			6,579	13,151
AOCI (loss), end of period	(33,155)	(35,346)		(115,149)	(119,533)		(33,155)	(115,149)
Accumulated other comprehensive income (loss), tax
AOCI (loss), beginning of period	(7,424)		(8,345)	(25,103)		(26,944)	(8,345)	(26,944)
Amortization of prior service costs	76			75			227	225
Amortization of net actuarial loss	384			846			1,154	2,537
Pension and other postretirement plans, OCI	460			921			1,381	2,762
AOCI (loss), end of period	(6,964)	(7,424)		(24,182)	(25,103)		(6,964)	(24,182)
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	(27,922)		(31,389)	(94,430)		(101,356)	(31,389)	(101,356)
Amortization of prior service costs	285			282			855	846
Amortization of net actuarial loss	1,446			3,181			4,343	9,543
Pension and other postretirement plans, OCI	1,731			3,463			5,198	10,389
AOCI (loss), end of period	(26,191)	(27,922)		(90,967)	(94,430)		(26,191)	(90,967)
Total
Accumulated other comprehensive income (loss), before tax
AOCI (loss), beginning of period	(93,326)		(32,012)	(97,840)		(98,916)	(32,012)	(98,916)
Investment securities, OCI (loss)	(21,743)			(4,723)			(87,445)	(12,414)
Pension and other postretirement plans, OCI	2,191			4,384			6,579	13,151
OCI (loss)	(19,552)			(339)			(80,866)	737
AOCI (loss), end of period	(112,878)	(93,326)		(98,179)	(97,840)		(112,878)	(98,179)
Accumulated other comprehensive income (loss), tax
AOCI (loss), beginning of period	(19,601)		(6,724)	(20,547)		(20,773)	(6,724)	(20,773)
Investment securities, OCI (loss)	(4,565)			(991)			(18,363)	(2,606)
Pension and other postretirement plans, OCI	460			921			1,381	2,762
OCI (loss)	(4,105)			(70)			(16,982)	156
AOCI (loss), end of period	(23,706)	(19,601)		(20,617)	(20,547)		(23,706)	(20,617)
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	(73,725)		(25,288)	(77,293)		(78,143)	(25,288)	(78,143)
Change in unrealized holding losses on available-for-sale securities	(17,178)			(3,732)			(69,082)	(9,808)
Pension and other postretirement plans, OCI	1,731			3,463			5,198	10,389
Other comprehensive (loss) income	(15,447)	(23,248)	$ (25,189)	(269)	6,139	$ (5,289)	(63,884)	581
AOCI (loss), end of period	$ (89,172)	$ (73,725)		$ (77,562)	$ (77,293)		$ (89,172)	$ (77,562)

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AOCI Attributable to Parent, Tax [Abstract]

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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