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Investments (Available-For-Sale Securities Disclosure) (Details) - Available-for-sale Securities [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost/Amortized Cost | $ 5,879,986 | $ 5,270,798
Unrealized Gains | 223,372 | 47,369
Unrealized Losses | (7,738) | (45,067)
Total AFS securities | 6,095,620 | 5,273,100
U.S. Government and Government Agencies [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost/Amortized Cost | 112,680 | 120,092
Unrealized Gains | 3,506 | 1,810
Unrealized Losses | 0 | (592)
Total AFS securities | 116,186 | 121,310
Foreign Government [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost/Amortized Cost | 18,011 | 23,202
Unrealized Gains | 533 | 36
Unrealized Losses | (2) | (107)
Total AFS securities | 18,542 | 23,131
Obligations of States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost/Amortized Cost | 1,168,185 | 1,121,615
Unrealized Gains | 62,175 | 19,485
Unrealized Losses | (270) | (2,631)
Total AFS securities | 1,230,090 | 1,138,469
Corporate Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost/Amortized Cost | 1,866,881 | 1,639,852
Unrealized Gains | 81,906 | 5,521
Unrealized Losses | (1,310) | (27,965)
Total AFS securities | 1,947,477 | 1,617,408
Collateralized Loan Obligations and Other Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost/Amortized Cost | 790,517 | 720,193
Unrealized Gains | 7,929 | 4,112
Unrealized Losses | (5,434) | (6,943)
Total AFS securities | 793,012 | 717,362
Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost/Amortized Cost | 514,709 | 527,409
Unrealized Gains | 23,902 | 3,417
Unrealized Losses | (267) | (3,748)
Total AFS securities | 538,344 | 527,078
Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost/Amortized Cost | 1,409,003 | 1,118,435
Unrealized Gains | 43,421 | 12,988
Unrealized Losses | (455) | (3,081)
Total AFS securities | $ 1,451,969 | $ 1,128,342

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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