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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost/Amortized Cost | $ 6,311,749 |  | $ 6,311,749 |  | $ 6,073,517
Allowance for credit losses, Period beginning balance | 8,781 | $ 15,787 | 3,969 | $ 0 |
Allowance for credit losses, Period ending balance | 6,011 | 10,395 | 6,011 | 10,395 |
Interest and dividends due or accrued | 46,069 |  | 46,069 |  | 45,004
Current provision for securities without prior allowance | 155 | 863 | 3,820 | 10,930 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (2,427) | (5,720) | (1,102) | 0 |
Reductions for securities sold | (437) | (468) | (615) | (468) |
Reductions for securities identified as intent (or requirement) to sell during the period | (61) | (67) | (61) | (67) |
Unrealized Gains | 327,387 |  | 327,387 |  | 397,922
Unrealized Losses | (6,725) |  | (6,725) |  | (11,542)
Debt Securities, Available-for-sale, Fair Value | 6,626,400 |  | 6,626,400 |  | 6,455,928
Available-for-sale Securities | U.S. Government and Government Agencies [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost/Amortized Cost | 132,506 |  | 132,506 |  | 110,038
Allowance for credit losses, Period beginning balance |  |  | 0 |  |
Allowance for credit losses, Period ending balance | 0 |  | 0 |  |
Unrealized Gains | 4,319 |  | 4,319 |  | 6,239
Unrealized Losses | (631) |  | (631) |  | (137)
Debt Securities, Available-for-sale, Fair Value | 136,194 |  | 136,194 |  | 116,140
Available-for-sale Securities | Foreign Government [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost/Amortized Cost | 14,578 |  | 14,578 |  | 16,801
Allowance for credit losses, Period beginning balance | 56 | 21 | 1 | 0 |
Allowance for credit losses, Period ending balance | 49 | 28 | 49 | 28 |
Current provision for securities without prior allowance | 0 | 0 | 49 | 28 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (7) | 7 | (1) | 0 |
Reductions for securities sold | 0 | 0 | 0 | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 | 0 | 0 |
Unrealized Gains | 819 |  | 819 |  | 1,569
Unrealized Losses | (73) |  | (73) |  | (3)
Debt Securities, Available-for-sale, Fair Value | 15,275 |  | 15,275 |  | 18,366
Available-for-sale Securities | Obligations of States and Political Subdivisions [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost/Amortized Cost | 1,119,039 |  | 1,119,039 |  | 1,159,588
Allowance for credit losses, Period beginning balance | 201 | 29 | 4 | 0 |
Allowance for credit losses, Period ending balance | 38 | 17 | 38 | 17 |
Current provision for securities without prior allowance | 0 | 15 | 25 | 17 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (163) | (27) | 9 | 0 |
Reductions for securities sold | 0 | 0 | 0 | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 | 0 | 0 |
Unrealized Gains | 81,003 |  | 81,003 |  | 87,564
Unrealized Losses | (103) |  | (103) |  | (11)
Debt Securities, Available-for-sale, Fair Value | 1,199,901 |  | 1,199,901 |  | 1,247,137
Available-for-sale Securities | Corporate Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost/Amortized Cost | 2,325,858 |  | 2,325,858 |  | 2,152,203
Allowance for credit losses, Period beginning balance | 6,166 | 13,412 | 2,782 | 0 |
Allowance for credit losses, Period ending balance | 3,477 | 8,077 | 3,477 | 8,077 |
Current provision for securities without prior allowance | 148 | 813 | 2,185 | 8,539 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (2,403) | (5,686) | (909) | 0 |
Reductions for securities sold | (373) | (395) | (520) | (395) |
Reductions for securities identified as intent (or requirement) to sell during the period | (61) | (67) | (61) | (67) |
Unrealized Gains | 146,061 |  | 146,061 |  | 180,971
Unrealized Losses | (1,555) |  | (1,555) |  | (2,340)
Debt Securities, Available-for-sale, Fair Value | 2,466,887 |  | 2,466,887 |  | 2,328,052
Available-for-sale Securities | Collateralized Loan Obligations and Other Asset Backed Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost/Amortized Cost | 1,266,236 |  | 1,266,236 |  | 1,014,820
Allowance for credit losses, Period beginning balance | 1,470 | 1,565 | 592 | 0 |
Allowance for credit losses, Period ending balance | 1,399 | 1,389 | 1,399 | 1,389 |
Current provision for securities without prior allowance | 0 | 27 | 941 | 1,447 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (70) | (145) | (116) | 0 |
Reductions for securities sold | (1) | (58) | (18) | (58) |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 | 0 | 0 |
Unrealized Gains | 20,110 |  | 20,110 |  | 20,166
Unrealized Losses | (2,724) |  | (2,724) |  | (7,843)
Debt Securities, Available-for-sale, Fair Value | 1,282,223 |  | 1,282,223 |  | 1,026,551
Available-for-sale Securities | Residential Mortgage Backed Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost/Amortized Cost | 820,650 |  | 820,650 |  | 999,485
Allowance for credit losses, Period beginning balance | 864 | 722 | 561 | 0 |
Allowance for credit losses, Period ending balance | 1,034 | 831 | 1,034 | 831 |
Current provision for securities without prior allowance | 3 | 0 | 618 | 846 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | 230 | 124 | (68) | 0 |
Reductions for securities sold | (63) | (15) | (77) | (15) |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 | 0 | 0 |
Unrealized Gains | 35,655 |  | 35,655 |  | 53,065
Unrealized Losses | (774) |  | (774) |  | (201)
Debt Securities, Available-for-sale, Fair Value | 854,497 |  | 854,497 |  | 1,051,788
Available-for-sale Securities | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cost/Amortized Cost | 632,882 |  | 632,882 |  | 620,582
Allowance for credit losses, Period beginning balance | 24 | 38 | 29 | 0 |
Allowance for credit losses, Period ending balance | 14 | 53 | 14 | 53 |
Current provision for securities without prior allowance | 4 | 8 | 2 | 53 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (14) | 7 | (17) | 0 |
Reductions for securities sold | 0 | 0 | 0 | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | $ 0 | 0 | $ 0 |
Unrealized Gains | 39,420 |  | 39,420 |  | 48,348
Unrealized Losses | (865) |  | (865) |  | (1,007)
Debt Securities, Available-for-sale, Fair Value | 671,423 |  | 671,423 |  | 667,894
Available-for-sale Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Interest and dividends due or accrued | $ 44,900 |  | $ 44,900 |  | $ 43,800

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