Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Accumulated other comprehensive income (loss), before tax
Investment securities, OCI (loss)	$ 7,926		$ 1,951		$ 15,240	$ 997
Pension and other postretirement plans, OCI (loss)	(233)		(4,347)		(942)	(5,709)
OCI (loss)	7,693		(2,396)		14,298	(4,712)
Accumulated other comprehensive income (loss), tax
Investment securities, OCI (loss)	1,665		410		3,201	210
Pension and other postretirement plans, OCI (loss)	(50)		(913)		(198)	(1,199)
OCI (loss)	1,615		(503)		3,003	(989)
Accumulated other comprehensive income (loss), net of tax
Net of tax, beginning balance	2,067,351	$ 1,987,258	1,726,180	$ 1,662,835	1,987,258	1,662,835
Investment securities, OCI (loss)	6,261		1,541		12,039	787
Pension and other postretirement plans, OCI (loss)	(183)		(3,434)		(744)	(4,510)
OCI (loss)	6,078	5,217	(1,893)	(1,830)	11,295	(3,723)
Net of tax, ending balance	2,184,545	2,067,351	1,828,813	1,726,180	2,184,545	1,828,813
Total
Accumulated other comprehensive income (loss), before tax
Before tax, beginning balance	(53,639)	(60,244)	(19,279)	(16,963)	(60,244)	(16,963)
Before tax, ending balance	(45,946)	(53,639)	(21,675)	(19,279)	(45,946)	(21,675)
Accumulated other comprehensive income (loss), tax
Income Tax, beginning balance	(11,265)	(12,653)	(4,049)	(3,563)	(12,653)	(3,563)
Income Tax, ending balance	(9,650)	(11,265)	(4,552)	(4,049)	(9,650)	(4,552)
Accumulated other comprehensive income (loss), net of tax
Net of tax, beginning balance	(42,374)	(47,591)	(15,230)	(13,400)	(47,591)	(13,400)
OCI (loss)	6,078	5,217	(1,893)	(1,830)
Net of tax, ending balance	(36,296)	(42,374)	(17,123)	(15,230)	(36,296)	(17,123)
Investment securities:
Accumulated other comprehensive income (loss), before tax
Before tax, beginning balance	(15,128)	(22,442)	(32,356)	(31,402)	(22,442)	(31,402)
OCI (loss) before reclassifications	6,774		(627)		13,461	(2,181)
Realized investment losses	431		2,375		693	2,637
Impairment losses	721		203		1,086	541
Investment securities, OCI (loss)	7,926		1,951		15,240	997
Before tax, ending balance	(7,202)	(15,128)	(30,405)	(32,356)	(7,202)	(30,405)
Accumulated other comprehensive income (loss), tax
Income Tax, beginning balance	(3,178)	(4,714)	(6,795)	(6,595)	(4,714)	(6,595)
OCI (loss) before reclassifications	1,423		(132)		2,827	(458)
Realized investment losses	91		499		146	554
Impairment losses	151		43		228	114
Investment securities, OCI (loss)	1,665		410		3,201	210
Income Tax, ending balance	(1,513)	(3,178)	(6,385)	(6,795)	(1,513)	(6,385)
Accumulated other comprehensive income (loss), net of tax
Net of tax, beginning balance	(11,950)	(17,728)	(25,561)	(24,807)	(17,728)	(24,807)
OCI (loss) before reclassifications	5,351		(495)		10,634	(1,723)
Realized investment losses	340		1,876		547	2,083
Impairment losses	570		160		858	427
Net of tax, ending balance	(5,689)	(11,950)	(24,020)	(25,561)	(5,689)	(24,020)
Pension and other postretirement plans:
Accumulated other comprehensive income (loss), before tax
Before tax, beginning balance	(38,511)	(37,802)	13,077	14,439	(37,802)	14,439
OCI (loss) before reclassifications	0		(1,731)		0	(1,731)
Amortization of prior service costs	422		397		844	786
Amortization of net actuarial gain	(655)		(1,734)		(1,309)	(3,485)
Settlement gain	0		(1,279)		(477)	(1,279)
Pension and other postretirement plans, OCI (loss)	(233)		(4,347)		(942)	(5,709)
Before tax, ending balance	(38,744)	(38,511)	8,730	13,077	(38,744)	8,730
Accumulated other comprehensive income (loss), tax
Income Tax, beginning balance	(8,087)	(7,939)	2,746	3,032	(7,939)	3,032
OCI (loss) before reclassifications	0		(364)		0	(364)
Amortization of prior service costs	88		83		177	165
Amortization of net actuarial gain	(138)		(364)		(275)	(732)
Settlement gain	0		(268)		(100)	(268)
Pension and other postretirement plans, OCI (loss)	(50)		(913)		(198)	(1,199)
Income Tax, ending balance	(8,137)	(8,087)	1,833	2,746	(8,137)	1,833
Accumulated other comprehensive income (loss), net of tax
Net of tax, beginning balance	(30,424)	(29,863)	10,331	11,407	(29,863)	11,407
OCI (loss) before reclassifications	0		(1,367)		0	(1,367)
Amortization of prior service costs	334		314		667	621
Amortization of net actuarial gain	(517)		(1,370)		(1,034)	(2,753)
Settlement gain	0		(1,011)		(377)	(1,011)
Pension and other postretirement plans, OCI (loss)	(183)		(3,434)		(744)	(4,510)
Net of tax, ending balance	$ (30,607)	$ (30,424)	$ 6,897	$ 10,331	$ (30,607)	$ 6,897

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Amount, before tax and after reclassification adjustment, of gain (loss) in value of unsold investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), attributable to parent.

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