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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | $ 6,253,077 |  | $ 6,073,517
Allowance for credit losses, Period beginning balance | 3,969 | $ 0 |
Allowance for credit losses, Period ending balance | 8,781 | 15,787 |
Interest and dividends due or accrued | 46,072 |  | 45,004
Current provision for securities without prior allowance | 5,667 | 15,787 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (677) | 0 |
Reductions for securities sold | (178) | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Unrealized Gains | 297,474 |  | 397,922
Unrealized Losses | (20,129) |  | (11,542)
Debt Securities, Available-for-sale, Fair Value | 6,521,641 |  | 6,455,928
Available-for-sale Securities | U.S. Government and Government Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 134,725 |  | 110,038
Allowance for credit losses, Period beginning balance | 0 |  |
Allowance for credit losses, Period ending balance | 0 |  |
Unrealized Gains | 3,653 |  | 6,239
Unrealized Losses | (2,104) |  | (137)
Debt Securities, Available-for-sale, Fair Value | 136,274 |  | 116,140
Available-for-sale Securities | Foreign Government [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 18,920 |  | 16,801
Allowance for credit losses, Period beginning balance | 1 | 0 |
Allowance for credit losses, Period ending balance | 56 | 21 |
Current provision for securities without prior allowance | 56 | 21 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (1) | 0 |
Reductions for securities sold | 0 | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Unrealized Gains | 974 |  | 1,569
Unrealized Losses | (136) |  | (3)
Debt Securities, Available-for-sale, Fair Value | 19,702 |  | 18,366
Available-for-sale Securities | Obligations of States and Political Subdivisions [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 1,140,442 |  | 1,159,588
Allowance for credit losses, Period beginning balance | 4 | 0 |
Allowance for credit losses, Period ending balance | 201 | 29 |
Current provision for securities without prior allowance | 186 | 29 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | 11 | 0 |
Reductions for securities sold | 0 | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Unrealized Gains | 74,212 |  | 87,564
Unrealized Losses | (360) |  | (11)
Debt Securities, Available-for-sale, Fair Value | 1,214,093 |  | 1,247,137
Available-for-sale Securities | Corporate Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 2,239,066 |  | 2,152,203
Allowance for credit losses, Period beginning balance | 2,782 | 0 |
Allowance for credit losses, Period ending balance | 6,166 | 13,412 |
Current provision for securities without prior allowance | 4,058 | 13,412 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (527) | 0 |
Reductions for securities sold | (147) | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Unrealized Gains | 122,761 |  | 180,971
Unrealized Losses | (9,870) |  | (2,340)
Debt Securities, Available-for-sale, Fair Value | 2,345,791 |  | 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 | 1,188,670 |  | 1,014,820
Allowance for credit losses, Period beginning balance | 592 | 0 |
Allowance for credit losses, Period ending balance | 1,470 | 1,565 |
Current provision for securities without prior allowance | 1,001 | 1,565 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (106) | 0 |
Reductions for securities sold | (17) | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Unrealized Gains | 18,917 |  | 20,166
Unrealized Losses | (4,052) |  | (7,843)
Debt Securities, Available-for-sale, Fair Value | 1,202,065 |  | 1,026,551
Available-for-sale Securities | Residential Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 906,266 |  | 999,485
Allowance for credit losses, Period beginning balance | 561 | 0 |
Allowance for credit losses, Period ending balance | 864 | 722 |
Current provision for securities without prior allowance | 356 | 722 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (39) | 0 |
Reductions for securities sold | (14) | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Unrealized Gains | 43,367 |  | 53,065
Unrealized Losses | (1,229) |  | (201)
Debt Securities, Available-for-sale, Fair Value | 947,540 |  | 1,051,788
Available-for-sale Securities | Commercial Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 624,988 |  | 620,582
Allowance for credit losses, Period beginning balance | 29 | 0 |
Allowance for credit losses, Period ending balance | 24 | 38 |
Current provision for securities without prior allowance | 10 | 38 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (15) | 0 |
Reductions for securities sold | 0 | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | $ 0 |
Unrealized Gains | 33,590 |  | 48,348
Unrealized Losses | (2,378) |  | (1,007)
Debt Securities, Available-for-sale, Fair Value | 656,176 |  | 667,894
Available-for-sale Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest and dividends due or accrued | $ 44,700 |  | $ 43,800

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