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Investments (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |
Total at end of period |  | $ 4,946,278 | $ 4,717,211
Total at end of period |  | 4,983,315 | 4,685,222
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract] |  |  |
Fair Value |  | 7,246 | 7,128
Total Investment Portfolio [Abstract] |  |  |
Amortized Cost |  | 4,953,501 | 4,724,355
Gross Unrealized Gains |  | 68,623 | 28,628
Gross Unrealized Losses |  | (31,563) | (60,633)
Fair Value |  | 4,990,561 | 4,692,350
Other than temporary impairments recorded in other comprehensive (loss) income |  | $ 0 | 0
Collateral, principal balance of FHLB (as a percent) | 102.00% | 102.00% |
Collateral, principal balance of FHLB |  | $ 166,900 |
Assets held by insurance regulatory requirements |  | 13,600 | 13,600
Maturities, Amortized Cost [Abstract] |  |  |
Due in one year or less |  | 541,755 |
Due after one year through five years |  | 1,547,712 |
Due after five years through ten years |  | 925,751 |
Due after ten years |  | 1,335,170 |
Total debt securities with single maturity date |  | 4,350,388 |
Total at end of period |  | 4,946,278 | 4,717,211
Maturities, Fair Value [Abstract] |  |  |
Due in one year or less |  | 541,695 |
Due after one year through five years |  | 1,544,943 |
Due after five years through ten years |  | 929,883 |
Due after ten years |  | 1,381,687 |
Total debt securities with single maturity date |  | 4,398,208 |
Total at end of period |  | 4,983,315 | 4,685,222
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |
Less than 12 months |  | 1,667,170 | 2,370,345
12 months or greater |  | 752,693 | 294,916
Total investment portfolio |  | 2,419,863 | 2,665,261
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months |  | (9,357) | (50,915)
12 months or greater |  | (22,206) | (9,718)
Total investment portfolio |  | $ (31,563) | $ (60,633)
Number of securities in unrealized loss position | security |  | 586 | 607
For securities in an unrealized loss position, percentage of fair value to amortized cost (in hundredths) |  | 99.00% |
For securities in an unrealized loss position, percentage backed by the U.S. Government (in hundredths) |  | 27.00% |
Total debt securities |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |
Total at end of period |  | $ 4,946,278 | $ 4,717,211
Gross Unrealized Gains |  | 68,584 | 28,620
Gross Unrealized Losses |  | (31,547) | (60,609)
Total at end of period |  | 4,983,315 | 4,685,222
Total Investment Portfolio [Abstract] |  |  |
Fair Value |  | 4,983,315 | 4,685,222
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period |  | 4,946,278 | 4,717,211
Maturities, Fair Value [Abstract] |  |  |
Total at end of period |  | 4,983,315 | 4,685,222
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |
Total at end of period |  | 179,850 | 73,847
Gross Unrealized Gains |  | 274 | 407
Gross Unrealized Losses |  | (1,278) | (724)
Total at end of period |  | 178,846 | 73,530
Total Investment Portfolio [Abstract] |  |  |
Fair Value |  | 178,846 | 73,530
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period |  | 179,850 | 73,847
Maturities, Fair Value [Abstract] |  |  |
Total at end of period |  | 178,846 | 73,530
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |
Less than 12 months |  | 144,042 | 48,642
12 months or greater |  | 31,196 | 0
Total investment portfolio |  | 175,238 | 48,642
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months |  | (796) | (724)
12 months or greater |  | (482) | 0
Total investment portfolio |  | (1,278) | (724)
Obligations of U.S. states and political subdivisions |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |
Total at end of period |  | 2,105,063 | 2,147,458
Gross Unrealized Gains |  | 56,210 | 20,983
Gross Unrealized Losses |  | (8,749) | (25,425)
Total at end of period |  | 2,152,524 | 2,143,016
Total Investment Portfolio [Abstract] |  |  |
Fair Value |  | 2,152,524 | 2,143,016
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period |  | 2,105,063 | 2,147,458
Maturities, Fair Value [Abstract] |  |  |
Total at end of period |  | 2,152,524 | 2,143,016
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |
Less than 12 months |  | 505,311 | 1,136,676
12 months or greater |  | 211,684 | 13,681
Total investment portfolio |  | 716,995 | 1,150,357
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months |  | (3,624) | (24,918)
12 months or greater |  | (5,125) | (507)
Total investment portfolio |  | (8,749) | (25,425)
Corporate debt securities |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |
Total at end of period |  | 2,065,475 | 1,756,461
Gross Unrealized Gains |  | 10,532 | 6,059
Gross Unrealized Losses |  | (9,169) | (18,610)
Total at end of period |  | 2,066,838 | 1,743,910
Total Investment Portfolio [Abstract] |  |  |
Fair Value |  | 2,066,838 | 1,743,910
Maturities, Amortized Cost [Abstract] |  |  |
Total at end of period |  | 2,065,475 | 1,756,461
Maturities, Fair Value [Abstract] |  |  |
Total at end of period |  | 2,066,838 | 1,743,910
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |
Less than 12 months |  | 932,350 | 915,777
12 months or greater |  | 200,716 | 35,769
Total investment portfolio |  | 1,133,066 | 951,546
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months |  | (4,288) | (16,771)
12 months or greater |  | (4,881) | (1,839)
Total investment portfolio |  | (9,169) | (18,610)
ABS |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |
Total at end of period |  | 4,925 | 59,519
Gross Unrealized Gains |  | 0 | 74
Gross Unrealized Losses |  | (2) | (28)
Total at end of period |  | 4,923 | 59,565
Total Investment Portfolio [Abstract] |  |  |
Fair Value |  | 4,923 | 59,565
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date |  | 4,925 |
Total at end of period |  | 4,925 | 59,519
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date |  | 4,923 |
Total at end of period |  | 4,923 | 59,565
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |
Less than 12 months |  | 4,923 | 3,366
12 months or greater |  | 0 | 656
Total investment portfolio |  | 4,923 | 4,022
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months |  | (2) | (28)
12 months or greater |  | 0 | 0
Total investment portfolio |  | (2) | (28)
RMBS |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |
Total at end of period |  | 189,153 | 231,733
Gross Unrealized Gains |  | 60 | 102
Gross Unrealized Losses |  | (7,364) | (7,626)
Total at end of period |  | 181,849 | 224,209
Total Investment Portfolio [Abstract] |  |  |
Fair Value |  | 181,849 | 224,209
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date |  | 189,153 |
Total at end of period |  | 189,153 | 231,733
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date |  | 181,849 |
Total at end of period |  | 181,849 | 224,209
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |
Less than 12 months |  | 14,979 | 46,493
12 months or greater |  | 166,329 | 171,326
Total investment portfolio |  | 181,308 | 217,819
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months |  | (280) | (857)
12 months or greater |  | (7,084) | (6,769)
Total investment portfolio |  | (7,364) | (7,626)
CMBS |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |
Total at end of period |  | 301,014 | 327,042
Gross Unrealized Gains |  | 1,204 | 769
Gross Unrealized Losses |  | (4,906) | (7,994)
Total at end of period |  | 297,312 | 319,817
Total Investment Portfolio [Abstract] |  |  |
Fair Value |  | 297,312 | 319,817
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date |  | 301,014 |
Total at end of period |  | 301,014 | 327,042
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date |  | 297,312 |
Total at end of period |  | 297,312 | 319,817
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |
Less than 12 months |  | 51,096 | 205,545
12 months or greater |  | 138,769 | 38,587
Total investment portfolio |  | 189,865 | 244,132
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months |  | (358) | (7,529)
12 months or greater |  | (4,548) | (465)
Total investment portfolio |  | (4,906) | (7,994)
CLOs |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |
Total at end of period |  | 100,798 | 121,151
Gross Unrealized Gains |  | 304 | 226
Gross Unrealized Losses |  | (79) | (202)
Total at end of period |  | 101,023 | 121,175
Total Investment Portfolio [Abstract] |  |  |
Fair Value |  | 101,023 | 121,175
Maturities, Amortized Cost [Abstract] |  |  |
Debt securities without single maturity date |  | 100,798 |
Total at end of period |  | 100,798 | 121,151
Maturities, Fair Value [Abstract] |  |  |
Debt securities without single maturity date |  | 101,023 |
Total at end of period |  | 101,023 | 121,175
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |
Less than 12 months |  | 14,243 | 13,278
12 months or greater |  | 3,568 | 34,760
Total investment portfolio |  | 17,811 | 48,038
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months |  | (7) | (73)
12 months or greater |  | (72) | (129)
Total investment portfolio |  | (79) | (202)
Equity securities |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract] |  |  |
Amortized Cost |  | 7,223 | 7,144
Gross Unrealized Gains |  | 39 | 8
Gross Unrealized Losses |  | (16) | (24)
Fair Value |  | 7,246 | 7,128
Total Investment Portfolio [Abstract] |  |  |
Fair Value |  | 7,246 | 7,128
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |
Less than 12 months |  | 226 | 568
12 months or greater |  | 431 | 137
Total investment portfolio |  | 657 | 705
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |
Less than 12 months |  | (2) | (15)
12 months or greater |  | (14) | (9)
Total investment portfolio |  | $ (16) | $ (24)

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- Definition This item represents the total debt securities, categorized neither as held-to-maturity nor trading securities, which have a single maturity date, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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