Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025
Accumulated other comprehensive income (loss), before tax
Investment securities, OCI (loss)	$ 1,382		$ 7,926		$ (14,484)	$ 15,240
Pension and other postretirement plans, OCI (loss)	390		(233)		781	(942)
OCI (loss)	1,772		7,693		(13,703)	14,298
Accumulated other comprehensive income (loss), tax
Investment securities, OCI (loss)	290		1,665		(3,041)	3,201
Pension and other postretirement plans, OCI (loss)	82		(50)		164	(198)
OCI (loss)	372		1,615		(2,877)	3,003
Accumulated other comprehensive income (loss), net of tax
Net of tax, beginning balance	2,353,521	$ 2,283,374	2,067,351	$ 1,987,258	2,283,374	1,987,258
Investment securities, OCI (loss)	1,092		6,261		(11,443)	12,039
Pension and other postretirement plans, OCI (loss)	308		(183)		617	(744)
OCI (loss)	1,400	(12,226)	6,078	5,217	(10,826)	11,295
Net of tax, ending balance	2,467,106	2,353,521	2,184,545	2,067,351	2,467,106	2,184,545
Total
Accumulated other comprehensive income (loss), before tax
Before tax, beginning balance	(81,326)	(65,851)	(53,639)	(60,244)	(65,851)	(60,244)
Before tax, ending balance	(79,554)	(81,326)	(45,946)	(53,639)	(79,554)	(45,946)
Accumulated other comprehensive income (loss), tax
Income Tax, beginning balance	(17,079)	(13,830)	(11,265)	(12,653)	(13,830)	(12,653)
Income Tax, ending balance	(16,707)	(17,079)	(9,650)	(11,265)	(16,707)	(9,650)
Accumulated other comprehensive income (loss), net of tax
Net of tax, beginning balance	(64,247)	(52,021)	(42,374)	(47,591)	(52,021)	(47,591)
OCI (loss)	1,400	(12,226)	6,078	5,217
Net of tax, ending balance	(62,847)	(64,247)	(36,296)	(42,374)	(62,847)	(36,296)
Investment securities:
Accumulated other comprehensive income (loss), before tax
Before tax, beginning balance	(14,358)	1,508	(15,128)	(22,442)	1,508	(22,442)
OCI (loss) before reclassifications	71		6,774		(15,911)	13,461
Realized investment losses	963		431		814	693
Impairment losses	348		721		613	1,086
Investment securities, OCI (loss)	1,382		7,926		(14,484)	15,240
Before tax, ending balance	(12,976)	(14,358)	(7,202)	(15,128)	(12,976)	(7,202)
Accumulated other comprehensive income (loss), tax
Income Tax, beginning balance	(3,015)	316	(3,178)	(4,714)	316	(4,714)
OCI (loss) before reclassifications	15		1,423		(3,341)	2,827
Realized investment losses	202		91		171	146
Impairment losses	73		151		129	228
Investment securities, OCI (loss)	290		1,665		(3,041)	3,201
Income Tax, ending balance	(2,725)	(3,015)	(1,513)	(3,178)	(2,725)	(1,513)
Accumulated other comprehensive income (loss), net of tax
Net of tax, beginning balance	(11,343)	1,192	(11,950)	(17,728)	1,192	(17,728)
OCI (loss) before reclassifications	56		5,351		(12,570)	10,634
Realized investment losses	761		340		643	547
Impairment losses	275		570		484	858
Net of tax, ending balance	(10,251)	(11,343)	(5,689)	(11,950)	(10,251)	(5,689)
Pension and other postretirement plans:
Accumulated other comprehensive income (loss), before tax
Before tax, beginning balance	(66,968)	(67,359)	(38,511)	(37,802)	(67,359)	(37,802)
Amortization of prior service costs	458		422		916	844
Amortization of net actuarial gain	(68)		(655)		(135)	(1,309)
Settlement gain					0	(477)
Pension and other postretirement plans, OCI (loss)	390		(233)		781	(942)
Before tax, ending balance	(66,578)	(66,968)	(38,744)	(38,511)	(66,578)	(38,744)
Accumulated other comprehensive income (loss), tax
Income Tax, beginning balance	(14,064)	(14,146)	(8,087)	(7,939)	(14,146)	(7,939)
Amortization of prior service costs	96		88		192	177
Amortization of net actuarial gain	(14)		(138)		(28)	(275)
Settlement gain					0	(100)
Pension and other postretirement plans, OCI (loss)	82		(50)		164	(198)
Income Tax, ending balance	(13,982)	(14,064)	(8,137)	(8,087)	(13,982)	(8,137)
Accumulated other comprehensive income (loss), net of tax
Net of tax, beginning balance	(52,904)	(53,213)	(30,424)	(29,863)	(53,213)	(29,863)
Amortization of prior service costs	362		334		724	667
Amortization of net actuarial gain	(54)		(517)		(107)	(1,034)
Settlement gain					0	(377)
Pension and other postretirement plans, OCI (loss)	308		(183)		617	(744)
Net of tax, ending balance	$ (52,596)	$ (52,904)	$ (30,607)	$ (30,424)	$ (52,596)	$ (30,607)

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