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Investments - Securities In Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | $ 514,490 | $ 2,209,765
12 months or greater | 337,668 | 491,195
Total investment portfolio | 852,158 | 2,700,960
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (4,556) | (49,346)
12 months or greater | (5,406) | (18,494)
Total investment portfolio | (9,962) | (67,840)
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 22,655 | 60,548
12 months or greater | 0 | 1,923
Total investment portfolio | 22,655 | 62,471
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (41) | (1,467)
12 months or greater | 0 | (475)
Total investment portfolio | (41) | (1,942)
Obligations of U.S. states and political subdivisions |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 185,163 | 417,615
12 months or greater | 13,942 | 37,014
Total investment portfolio | 199,105 | 454,629
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (815) | (6,404)
12 months or greater | (307) | (886)
Total investment portfolio | (1,122) | (7,290)
Corporate debt securities |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 200,500 | 1,470,628
12 months or greater | 41,424 | 114,982
Total investment portfolio | 241,924 | 1,585,610
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (2,843) | (38,519)
12 months or greater | (1,536) | (6,251)
Total investment portfolio | (4,379) | (44,770)
Asset-backed securities |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 20 | 86,604
12 months or greater | 4,102 | 5,546
Total investment portfolio | 4,122 | 92,150
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (32) | (173)
12 months or greater | 0 | (30)
Total investment portfolio | (32) | (203)
Residential mortgage-backed securities |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 3,204 | 35,064
12 months or greater | 186,494 | 209,882
Total investment portfolio | 189,698 | 244,946
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (7) | (312)
12 months or greater | (3,049) | (8,080)
Total investment portfolio | (3,056) | (8,392)
Commercial mortgage-backed securities |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 84,048 | 134,488
12 months or greater | 38,992 | 69,927
Total investment portfolio | 123,040 | 204,415
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (632) | (2,361)
12 months or greater | (348) | (1,614)
Total investment portfolio | (980) | (3,975)
Collateralized loan obligations |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 18,868 | 0
12 months or greater | 52,570 | 51,750
Total investment portfolio | 71,438 | 51,750
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | (186) | 0
12 months or greater | (163) | (1,148)
Total investment portfolio | (349) | (1,148)
Debt securities issued by foreign sovereign governments |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months |  | 4,463
12 months or greater |  | 0
Total investment portfolio |  | 4,463
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months |  | (102)
12 months or greater |  | 0
Total investment portfolio |  | (102)
Equity securities |  |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |
Less than 12 months | 32 | 355
12 months or greater | 144 | 171
Total investment portfolio | 176 | 526
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |
Less than 12 months | 0 | (8)
12 months or greater | (3) | (10)
Total investment portfolio | $ (3) | $ (18)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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