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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | $ 6,097,973 | $ 6,097,973 | $ 5,879,986
Allowance for credit losses, Period beginning balance | 10,395 | 0 |
Allowance for credit losses, ending balance at September 30, 2020 | 7,180 | 7,180 |
Interest and dividends due or accrued | 46,392 | 46,392 | 44,846
Current provision for securities without prior allowance | 1,025 | 8,100 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (3,856) | 0 |
Reductions for securities sold | (362) | (830) |
Reductions for securities identified as intent (or requirement) to sell during the period | (22) | (90) |
Unrealized Gains | 371,159 | 371,159 | 223,372
Unrealized Losses | (24,415) | (24,415) | (7,738)
Debt Securities, Available-for-sale, Fair Value | 6,437,537 | 6,437,537 | 6,095,620
Available-for-sale Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
AFS Unrealized Losses | 24,400 | 24,400 | 7,700
Available-for-sale Securities | U.S. Government and Government Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 110,201 | 110,201 | 112,680
Allowance for credit losses, ending balance at September 30, 2020 | 0 | 0 |
Unrealized Gains | 7,374 | 7,374 | 3,506
Unrealized Losses | (46) | (46) | 0
Debt Securities, Available-for-sale, Fair Value | 117,529 | 117,529 | 116,186
Available-for-sale Securities | Foreign Government [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 15,679 | 15,679 | 18,011
Allowance for credit losses, Period beginning balance | 28 | 0 |
Allowance for credit losses, ending balance at September 30, 2020 | 7 | 7 |
Current provision for securities without prior allowance | 0 | 26 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (2) | 0 |
Reductions for securities sold | (19) | (19) |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Unrealized Gains | 1,336 | 1,336 | 533
Unrealized Losses | 0 | 0 | (2)
Debt Securities, Available-for-sale, Fair Value | 17,008 | 17,008 | 18,542
Available-for-sale Securities | Obligations of States and Political Subdivisions [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 1,152,794 | 1,152,794 | 1,168,185
Allowance for credit losses, Period beginning balance | 17 | 0 |
Allowance for credit losses, ending balance at September 30, 2020 | 15 | 15 |
Current provision for securities without prior allowance | 9 | 15 |
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 | 78,841 | 78,841 | 62,175
Unrealized Losses | (164) | (164) | (270)
Debt Securities, Available-for-sale, Fair Value | 1,231,456 | 1,231,456 | 1,230,090
Available-for-sale Securities | Corporate Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 2,154,302 | 2,154,302 | 1,866,881
Allowance for credit losses, Period beginning balance | 8,077 | 0 |
Allowance for credit losses, ending balance at September 30, 2020 | 5,358 | 5,358 |
Current provision for securities without prior allowance | 1,016 | 6,100 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (3,455) | 0 |
Reductions for securities sold | (265) | (659) |
Reductions for securities identified as intent (or requirement) to sell during the period | (15) | (83) |
Unrealized Gains | 157,689 | 157,689 | 81,906
Unrealized Losses | (7,802) | (7,802) | (1,310)
Debt Securities, Available-for-sale, Fair Value | 2,298,831 | 2,298,831 | 1,947,477
Available-for-sale Securities | Collateralized Loan Obligations and Other Asset Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 942,627 | 942,627 | 790,517
Allowance for credit losses, Period beginning balance | 1,389 | 0 |
Allowance for credit losses, ending balance at September 30, 2020 | 1,121 | 1,121 |
Current provision for securities without prior allowance | 0 | 1,237 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (210) | 0 |
Reductions for securities sold | (51) | (109) |
Reductions for securities identified as intent (or requirement) to sell during the period | (7) | (7) |
Unrealized Gains | 18,274 | 18,274 | 7,929
Unrealized Losses | (14,198) | (14,198) | (5,434)
Debt Securities, Available-for-sale, Fair Value | 945,582 | 945,582 | 793,012
Available-for-sale Securities | Residential Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 1,122,678 | 1,122,678 | 1,409,003
Allowance for credit losses, Period beginning balance | 831 | 0 |
Allowance for credit losses, ending balance at September 30, 2020 | 647 | 647 |
Current provision for securities without prior allowance | 0 | 690 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (157) | 0 |
Reductions for securities sold | (27) | (43) |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Unrealized Gains | 61,259 | 61,259 | 43,421
Unrealized Losses | (333) | (333) | (455)
Debt Securities, Available-for-sale, Fair Value | 1,182,957 | 1,182,957 | 1,451,969
Available-for-sale Securities | Commercial Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost/Amortized Cost | 599,692 | 599,692 | 514,709
Allowance for credit losses, Period beginning balance | 53 | 0 |
Allowance for credit losses, ending balance at September 30, 2020 | 32 | 32 |
Current provision for securities without prior allowance | 0 | 32 |
Increase or (Decrease) on securities with prior allowance, excluding intent (or Requirements) to sell securities | (21) | 0 |
Reductions for securities sold | 0 | 0 |
Reductions for securities identified as intent (or requirement) to sell during the period | 0 | 0 |
Unrealized Gains | 46,386 | 46,386 | 23,902
Unrealized Losses | (1,872) | (1,872) | (267)
Debt Securities, Available-for-sale, Fair Value | 644,174 | 644,174 | $ 538,344
Available-for-sale Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest and dividends due or accrued | 45,300 | 45,300 |
Current provision for securities without prior allowance | 2,854 | (8,010) |
Available-for-sale Securities [Member] | U.S. Government and Government Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Current provision for securities without prior allowance |  | 0 |
Available-for-sale Securities [Member] | Foreign Government [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Current provision for securities without prior allowance | 3 | (25) |
Available-for-sale Securities [Member] | Obligations of States and Political Subdivisions [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Current provision for securities without prior allowance | 2 | (15) |
Available-for-sale Securities [Member] | Corporate Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Current provision for securities without prior allowance | 2,454 | (6,018) |
Available-for-sale Securities [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Current provision for securities without prior allowance | 217 | (1,230) |
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Current provision for securities without prior allowance | 157 | (690) |
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Current provision for securities without prior allowance | $ 21 | $ (32) |

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