Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period		$ (25,288)			$ (25,288)
Change in unrealized holding (losses) gains on available-for-sale securities	$ (24,985)		$ 2,676		(51,904)	$ (6,076)
Pension and other postretirement plans, OCI	1,737		3,463		3,467	6,926
Other comprehensive (loss) income	(23,248)	(25,189)	6,139	$ (5,289)	(48,437)	850
AOCI (loss), end of period	(73,725)				(73,725)
Investment securities:
Accumulated other comprehensive income (loss), before tax
AOCI (loss), beginning of period	(26,353)	7,722	18,306	29,384	7,722	29,384
OCI (loss) before reclassifications	(34,087)		3,783		(70,458)	(5,725)
Realized investment losses (gains)	2,422		(397)		4,502	(1,880)
Impairment losses	38		1		254	(86)
Investment securities, OCI (loss)	(31,627)		3,387		(65,702)	(7,691)
AOCI (loss), end of period	(57,980)	(26,353)	21,693	18,306	(57,980)	21,693
Accumulated other comprehensive income (loss), tax
AOCI (loss), beginning of period	(5,535)	1,621	3,845	6,171	1,621	6,171
OCI (loss) before reclassifications	(7,158)		795		(14,796)	(1,202)
Realized investment losses (gains)	508		(84)		945	(395)
Impairment losses	8		0		53	(18)
Investment securities, OCI (loss)	(6,642)		711		(13,798)	(1,615)
AOCI (loss), end of period	(12,177)	(5,535)	4,556	3,845	(12,177)	4,556
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	(20,818)	6,101	14,461	23,213	6,101	23,213
OCI (loss) before reclassifications	(26,929)		2,988		(55,662)	(4,523)
Realized investment losses (gains)	1,914		(313)		3,557	(1,485)
Impairment losses	30		1		201	(68)
Change in unrealized holding (losses) gains on available-for-sale securities	(24,985)		2,676		(51,904)	(6,076)
AOCI (loss), end of period	(45,803)	(20,818)	17,137	14,461	(45,803)	17,137
Pension and other postretirement plans:
Accumulated other comprehensive income (loss), before tax
AOCI (loss), beginning of period	(37,543)	(39,734)	(123,917)	(128,300)	(39,734)	(128,300)
Amortization of prior service costs	360		357		721	714
Amortization of net actuarial loss	1,837		4,027		3,667	8,053
Pension and other postretirement plans, OCI	2,197		4,384		4,388	8,767
AOCI (loss), end of period	(35,346)	(37,543)	(119,533)	(123,917)	(35,346)	(119,533)
Accumulated other comprehensive income (loss), tax
AOCI (loss), beginning of period	(7,884)	(8,345)	(26,024)	(26,944)	(8,345)	(26,944)
Amortization of prior service costs	75		75		151	150
Amortization of net actuarial loss	385		846		770	1,691
Pension and other postretirement plans, OCI	460		921		921	1,841
AOCI (loss), end of period	(7,424)	(7,884)	(25,103)	(26,024)	(7,424)	(25,103)
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	(29,659)	(31,389)	(97,893)	(101,356)	(31,389)	(101,356)
Amortization of prior service costs	285		282		570	564
Amortization of net actuarial loss	1,452		3,181		2,897	6,362
Pension and other postretirement plans, OCI	1,737		3,463		3,467	6,926
AOCI (loss), end of period	(27,922)	(29,659)	(94,430)	(97,893)	(27,922)	(94,430)
Total
Accumulated other comprehensive income (loss), before tax
AOCI (loss), beginning of period	(63,896)	(32,012)	(105,611)	(98,916)	(32,012)	(98,916)
Investment securities, OCI (loss)	(31,627)		3,387		(65,702)	(7,691)
Pension and other postretirement plans, OCI	2,197		4,384		4,388	8,767
OCI (loss)	(29,430)		7,771		(61,314)	1,076
AOCI (loss), end of period	(93,326)	(63,896)	(97,840)	(105,611)	(93,326)	(97,840)
Accumulated other comprehensive income (loss), tax
AOCI (loss), beginning of period	(13,419)	(6,724)	(22,179)	(20,773)	(6,724)	(20,773)
Investment securities, OCI (loss)	(6,642)		711		(13,798)	(1,615)
Pension and other postretirement plans, OCI	460		921		921	1,841
OCI (loss)	(6,182)		1,632		(12,877)	226
AOCI (loss), end of period	(19,601)	(13,419)	(20,547)	(22,179)	(19,601)	(20,547)
Accumulated other comprehensive income (loss), net of tax
AOCI (loss), beginning of period	(50,477)	(25,288)	(83,432)	(78,143)	(25,288)	(78,143)
Change in unrealized holding (losses) gains on available-for-sale securities	(24,985)		2,676		(51,904)	(6,076)
Pension and other postretirement plans, OCI	1,737		3,463		3,467	6,926
Other comprehensive (loss) income	(23,248)	(25,189)	6,139	(5,289)	(48,437)	850
AOCI (loss), end of period	$ (73,725)	$ (50,477)	$ (77,293)	$ (83,432)	$ (73,725)	$ (77,293)

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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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