Employee Benefit Plans (Fair Value Of Pension Plan Assets By Asset Category) (Details) - USD ($) $ in Thousands		Dec. 31, 2025		Dec. 31, 2024
U.S. government obligations		$ 3,279,100		$ 2,555,252
Government-sponsored enterprise obligations		44,712		42,849
State and municipal obligations		664,733		742,891
Agency mortgage-backed securities		3,223,105		3,444,891
Non-agency mortgage-backed securities		435,688		568,689
Asset-backed securities		1,262,045		1,557,015
Pension Plans [Member]
U.S. government obligations		22,420		12,072
Government-sponsored enterprise obligations	[1]	1,018		991
State and municipal obligations		2,550		3,513
Agency mortgage-backed securities	[2]	1,837		2,026
Non-agency mortgage-backed securities		2,041		2,202
Asset-backed securities		4,050		5,171
Corporate bonds	[3]	44,330		45,526
Mutual funds		7,847	[4]	6,462	[5]
Common stocks	[5]			7,075
International developed markets	[5]			1,353
Emerging markets	[5]			202
Total		86,093		86,593
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
U.S. government obligations		3,279,100		2,555,252
Government-sponsored enterprise obligations		0		0
State and municipal obligations		0		0
Agency mortgage-backed securities		0		0
Non-agency mortgage-backed securities		0		0
Asset-backed securities		0		0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Pension Plans [Member]
U.S. government obligations		22,420		12,072
Government-sponsored enterprise obligations	[1]	0		0
State and municipal obligations		0		0
Agency mortgage-backed securities	[2]	0		0
Non-agency mortgage-backed securities		0		0
Asset-backed securities		0		0
Corporate bonds	[3]	0		0
Mutual funds		7,847	[4]	6,462	[5]
Common stocks	[5]			7,075
International developed markets	[5]			1,353
Emerging markets	[5]			202
Total		30,267		27,164
Significant Other Observable Inputs (Level 2) [Member]
U.S. government obligations		0		0
Government-sponsored enterprise obligations		44,712		42,849
State and municipal obligations		663,781		741,927
Agency mortgage-backed securities		3,223,105		3,444,891
Non-agency mortgage-backed securities		435,688		568,689
Asset-backed securities		1,262,045		1,557,015
Significant Other Observable Inputs (Level 2) [Member] | Pension Plans [Member]
U.S. government obligations		0		0
Government-sponsored enterprise obligations	[1]	1,018		991
State and municipal obligations		2,550		3,513
Agency mortgage-backed securities	[2]	1,837		2,026
Non-agency mortgage-backed securities		2,041		2,202
Asset-backed securities		4,050		5,171
Corporate bonds	[3]	44,330		45,526
Mutual funds		0	[4]	0	[5]
Common stocks	[5]			0
International developed markets	[5]			0
Emerging markets	[5]			0
Total		55,826		59,429
Significant Unobservable Inputs (Level 3) [Member]
U.S. government obligations		0		0
Government-sponsored enterprise obligations		0		0
State and municipal obligations		952		964
Agency mortgage-backed securities		0		0
Non-agency mortgage-backed securities		0		0
Asset-backed securities		0		0
Significant Unobservable Inputs (Level 3) [Member] | Pension Plans [Member]
U.S. government obligations		0		0
Government-sponsored enterprise obligations	[1]	0		0
State and municipal obligations		0		0
Agency mortgage-backed securities	[2]	0		0
Non-agency mortgage-backed securities		0		0
Asset-backed securities		0		0
Corporate bonds	[3]	0		0
Mutual funds		0	[4]	0	[5]
Common stocks	[5]			0
International developed markets	[5]			0
Emerging markets	[5]			0
Total		$ 0		$ 0

[1] This category represents bonds (excluding mortgage-backed securities) issued by agencies such as the Government National Mortgage Association, the Federal Home Loan Mortgage Corp and the Federal National Mortgage Association.

[2] This category represents mortgage-backed securities issued by the agencies mentioned in (a).

[3] This category represents investment grade bonds issued in the U.S., primarily by domestic issuers, representing diverse industries.

[4] As of 12/31/2025, this category consists solely of U.S. government money market mutual funds.

[5] This category represents investments in individual common stocks and equity funds. These holdings are diversified, largely across the electronic technology, technology services, financial services, healthcare technology, and retail trade industries.