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Employee Benefit Plans (Fair Value Of Pension Plan Assets By Asset Category) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
U.S. government obligations $ 838,059 $ 851,776
Government-sponsored enterprise obligations 54,485 139,277
State and municipal obligations 2,045,099 1,267,927
Agency mortgage-backed securities 6,712,085 3,937,964
Non-agency mortgage-backed securities 361,074 809,782
Asset-backed securities 1,882,243 1,233,489
Pension Plans [Member]    
U.S. government obligations 5,306 4,746
Government-sponsored enterprise obligations [1] 2,142 1,302
State and municipal obligations 9,471 8,612
Agency mortgage-backed securities [2] 6,984 8,892
Non-agency mortgage-backed securities 2,225 3,919
Asset-backed securities 6,090 5,093
Corporate bonds [3] 41,278 39,663
Mutual funds [4] 5,584 6,315
Common stocks [4] 24,991 22,552
International developed markets [4] 1,976 4,674
Emerging markets [4] 3,568 1,788
Total 109,615 107,556
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
U.S. government obligations 838,059 851,776
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 5,306 4,746
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 [4] 5,584 6,315
Common stocks [4] 24,991 22,552
International developed markets [4] 1,976 4,674
Emerging markets [4] 3,568 1,788
Total 41,425 40,075
Significant Other Observable Inputs (Level 2) [Member]    
U.S. government obligations 0 0
Government-sponsored enterprise obligations 54,485 139,277
State and municipal obligations 2,037,131 1,258,074
Agency mortgage-backed securities 6,712,085 3,937,964
Non-agency mortgage-backed securities 361,074 809,782
Asset-backed securities 1,882,243 1,233,489
Significant Other Observable Inputs (Level 2) [Member] | Pension Plans [Member]    
U.S. government obligations 0 0
Government-sponsored enterprise obligations [1] 2,142 1,302
State and municipal obligations 9,471 8,612
Agency mortgage-backed securities [2] 6,984 8,892
Non-agency mortgage-backed securities 2,225 3,919
Asset-backed securities 6,090 5,093
Corporate bonds [3] 41,278 39,663
Mutual funds [4] 0 0
Common stocks [4] 0 0
International developed markets [4] 0 0
Emerging markets [4] 0 0
Total 68,190 67,481
Significant Unobservable Inputs (Level 3) [Member]    
U.S. government obligations 0 0
Government-sponsored enterprise obligations 0 0
State and municipal obligations 7,968 9,853
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 [4] 0 0
Common stocks [4] 0 0
International developed markets [4] 0 0
Emerging markets [4] 0 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] This category represents investments in individual common stocks and equity funds. These holdings are diversified, largely across the technology services, electronic technology, financial services, healthcare, and consumer non-durables industries.