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Investments (Details) | 1 Months Ended | 12 Months Ended
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Feb. 29, 2016 | Dec. 31, 2016 USD ($) security | Dec. 31, 2015 USD ($) security | Dec. 31, 2014 USD ($)
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |  |
Total at end of period |  | $ 4,717,211,000 | $ 4,684,148,000 |
Total at end of period |  | 4,685,222,000 | 4,657,561,000 |
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract] |  |  |  |
Fair Value |  | 7,128,000 | 5,645,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Amortized Cost |  | 4,724,355,000 | 4,689,773,000 |
Gross Unrealized Gains |  | 28,628,000 | 41,273,000 |
Gross Unrealized Losses |  | (60,633,000) | (67,840,000) |
Fair Value |  | $ 4,692,350,000 | 4,663,206,000 |
Collateral, principal balance of FHLB (as a percent) | 102.00% | 102.00% |  |
Collateral, principal balance of FHLB |  | $ 164,400,000 |  |
Maturities, Amortized Cost [Abstract] |  |  |  |
Due in one year or less |  | 433,464,000 |  |
Due after one year through five years |  | 1,211,034,000 |  |
Due after five years through ten years |  | 1,157,091,000 |  |
Due after ten years |  | 1,176,177,000 |  |
Total debt securities with single maturity date |  | 3,977,766,000 |  |
Total at end of period |  | 4,717,211,000 | 4,684,148,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Due in one year or less |  | 433,770,000 |  |
Due after one year through five years |  | 1,212,650,000 |  |
Due after five years through ten years |  | 1,139,552,000 |  |
Due after ten years |  | 1,174,484,000 |  |
Total debt securities with single maturity date |  | 3,960,456,000 |  |
Total at end of period |  | 4,685,222,000 | 4,657,561,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  | 2,370,345,000 | 2,209,765,000 |
12 months or greater |  | 294,916,000 | 491,195,000 |
Total investment portfolio |  | 2,665,261,000 | 2,700,960,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  | (50,915,000) | (49,346,000) |
12 months or greater |  | (9,718,000) | (18,494,000) |
Total investment portfolio |  | $ (60,633,000) | $ (67,840,000) |
Number of securities in unrealized loss position | security |  | 607 | 303 |
For securities in an unrealized loss position, percentage of fair value to amortized cost (in hundredths) |  | 98.00% |  |
For securities in an unrealized loss position, percentage backed by the U.S. Government (in hundredths) |  | 14.00% |  |
Recognized other than temporary impairments |  | $ 0 | $ 0 | $ 144,000
Assets held by insurance regulatory requirements |  | 13,600,000 | 18,900,000 |
Total debt securities |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |  |
Total at end of period |  | 4,717,211,000 | 4,684,148,000 |
Gross Unrealized Gains |  | 28,620,000 | 41,235,000 |
Gross Unrealized Losses |  | (60,609,000) | (67,822,000) |
Total at end of period |  | 4,685,222,000 | 4,657,561,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  | 4,685,222,000 | 4,657,561,000 |
Maturities, Amortized Cost [Abstract] |  |  |  |
Total at end of period |  | 4,717,211,000 | 4,684,148,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Total at end of period |  | 4,685,222,000 | 4,657,561,000 |
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 |  | 73,847,000 | 160,393,000 |
Gross Unrealized Gains |  | 407,000 | 2,133,000 |
Gross Unrealized Losses |  | (724,000) | (1,942,000) |
Total at end of period |  | 73,530,000 | 160,584,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  | 73,530,000 | 160,584,000 |
Maturities, Amortized Cost [Abstract] |  |  |  |
Total at end of period |  | 73,847,000 | 160,393,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Total at end of period |  | 73,530,000 | 160,584,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  | 48,642,000 | 60,548,000 |
12 months or greater |  | 0 | 1,923,000 |
Total investment portfolio |  | 48,642,000 | 62,471,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  | (724,000) | (1,467,000) |
12 months or greater |  | 0 | (475,000) |
Total investment portfolio |  | (724,000) | (1,942,000) |
Obligations of U.S. states and political subdivisions |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |  |
Total at end of period |  | 2,147,458,000 | 1,766,407,000 |
Gross Unrealized Gains |  | 20,983,000 | 33,410,000 |
Gross Unrealized Losses |  | (25,425,000) | (7,290,000) |
Total at end of period |  | 2,143,016,000 | 1,792,527,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  | 2,143,016,000 | 1,792,527,000 |
Maturities, Amortized Cost [Abstract] |  |  |  |
Total at end of period |  | 2,147,458,000 | 1,766,407,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Total at end of period |  | 2,143,016,000 | 1,792,527,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  | 1,136,676,000 | 417,615,000 |
12 months or greater |  | 13,681,000 | 37,014,000 |
Total investment portfolio |  | 1,150,357,000 | 454,629,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  | (24,918,000) | (6,404,000) |
12 months or greater |  | (507,000) | (886,000) |
Total investment portfolio |  | (25,425,000) | (7,290,000) |
Corporate debt securities |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |  |
Total at end of period |  | 1,756,461,000 | 2,046,697,000 |
Gross Unrealized Gains |  | 6,059,000 | 2,836,000 |
Gross Unrealized Losses |  | (18,610,000) | (44,770,000) |
Total at end of period |  | 1,743,910,000 | 2,004,763,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  | 1,743,910,000 | 2,004,763,000 |
Maturities, Amortized Cost [Abstract] |  |  |  |
Total at end of period |  | 1,756,461,000 | 2,046,697,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Total at end of period |  | 1,743,910,000 | 2,004,763,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  | 915,777,000 | 1,470,628,000 |
12 months or greater |  | 35,769,000 | 114,982,000 |
Total investment portfolio |  | 951,546,000 | 1,585,610,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  | (16,771,000) | (38,519,000) |
12 months or greater |  | (1,839,000) | (6,251,000) |
Total investment portfolio |  | (18,610,000) | (44,770,000) |
ABS |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |  |
Total at end of period |  | 59,519,000 | 116,764,000 |
Gross Unrealized Gains |  | 74,000 | 56,000 |
Gross Unrealized Losses |  | (28,000) | (203,000) |
Total at end of period |  | 59,565,000 | 116,617,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  | 59,565,000 | 116,617,000 |
Maturities, Amortized Cost [Abstract] |  |  |  |
Debt securities without single maturity date |  | 59,519,000 |  |
Total at end of period |  | 59,519,000 | 116,764,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Debt securities without single maturity date |  | 59,565,000 |  |
Total at end of period |  | 59,565,000 | 116,617,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  | 3,366,000 | 86,604,000 |
12 months or greater |  | 656,000 | 5,546,000 |
Total investment portfolio |  | 4,022,000 | 92,150,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  | (28,000) | (173,000) |
12 months or greater |  | 0 | (30,000) |
Total investment portfolio |  | (28,000) | (203,000) |
RMBS |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |  |
Total at end of period |  | 231,733,000 | 265,879,000 |
Gross Unrealized Gains |  | 102,000 | 161,000 |
Gross Unrealized Losses |  | (7,626,000) | (8,392,000) |
Total at end of period |  | 224,209,000 | 257,648,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  | 224,209,000 | 257,648,000 |
Maturities, Amortized Cost [Abstract] |  |  |  |
Debt securities without single maturity date |  | 231,733,000 |  |
Total at end of period |  | 231,733,000 | 265,879,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Debt securities without single maturity date |  | 224,209,000 |  |
Total at end of period |  | 224,209,000 | 257,648,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  | 46,493,000 | 35,064,000 |
12 months or greater |  | 171,326,000 | 209,882,000 |
Total investment portfolio |  | 217,819,000 | 244,946,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  | (857,000) | (312,000) |
12 months or greater |  | (6,769,000) | (8,080,000) |
Total investment portfolio |  | (7,626,000) | (8,392,000) |
CMBS |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |  |
Total at end of period |  | 327,042,000 | 237,304,000 |
Gross Unrealized Gains |  | 769,000 | 162,000 |
Gross Unrealized Losses |  | (7,994,000) | (3,975,000) |
Total at end of period |  | 319,817,000 | 233,491,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  | 319,817,000 | 233,491,000 |
Maturities, Amortized Cost [Abstract] |  |  |  |
Debt securities without single maturity date |  | 327,042,000 |  |
Total at end of period |  | 327,042,000 | 237,304,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Debt securities without single maturity date |  | 319,817,000 |  |
Total at end of period |  | 319,817,000 | 233,491,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  | 205,545,000 | 134,488,000 |
12 months or greater |  | 38,587,000 | 69,927,000 |
Total investment portfolio |  | 244,132,000 | 204,415,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  | (7,529,000) | (2,361,000) |
12 months or greater |  | (465,000) | (1,614,000) |
Total investment portfolio |  | (7,994,000) | (3,975,000) |
CLOs |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |  |
Total at end of period |  | 121,151,000 | 61,345,000 |
Gross Unrealized Gains |  | 226,000 | 3,000 |
Gross Unrealized Losses |  | (202,000) | (1,148,000) |
Total at end of period |  | 121,175,000 | 60,200,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  | 121,175,000 | 60,200,000 |
Maturities, Amortized Cost [Abstract] |  |  |  |
Debt securities without single maturity date |  | 121,151,000 |  |
Total at end of period |  | 121,151,000 | 61,345,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Debt securities without single maturity date |  | 121,175,000 |  |
Total at end of period |  | 121,175,000 | 60,200,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  | 13,278,000 | 0 |
12 months or greater |  | 34,760,000 | 51,750,000 |
Total investment portfolio |  | 48,038,000 | 51,750,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  | (73,000) | 0 |
12 months or greater |  | (129,000) | (1,148,000) |
Total investment portfolio |  | (202,000) | (1,148,000) |
Debt securities issued by foreign sovereign governments |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |  |  |
Total at end of period |  |  | 29,359,000 |
Gross Unrealized Gains |  |  | 2,474,000 |
Gross Unrealized Losses |  |  | (102,000) |
Total at end of period |  |  | 31,731,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  |  | 31,731,000 |
Maturities, Amortized Cost [Abstract] |  |  |  |
Total at end of period |  |  | 29,359,000 |
Maturities, Fair Value [Abstract] |  |  |  |
Total at end of period |  |  | 31,731,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  |  | 4,463,000 |
12 months or greater |  |  | 0 |
Total investment portfolio |  |  | 4,463,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  |  | (102,000) |
12 months or greater |  |  | 0 |
Total investment portfolio |  |  | (102,000) |
Equity securities |  |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract] |  |  |  |
Amortized Cost |  | 7,144,000 | 5,625,000 |
Gross Unrealized Gains |  | 8,000 | 38,000 |
Gross Unrealized Losses |  | (24,000) | (18,000) |
Fair Value |  | 7,128,000 | 5,645,000 |
Total Investment Portfolio [Abstract] |  |  |  |
Fair Value |  | 7,128,000 | 5,645,000 |
Continuous Unrealized Loss Portion, Fair Value [Abstract] |  |  |  |
Less than 12 months |  | 568,000 | 355,000 |
12 months or greater |  | 137,000 | 171,000 |
Total investment portfolio |  | 705,000 | 526,000 |
Continuous Unrealized Loss Portion, Unrealized Loses [Abstract] |  |  |  |
Less than 12 months |  | (15,000) | (8,000) |
12 months or greater |  | (9,000) | (10,000) |
Total investment portfolio |  | $ (24,000) | $ (18,000) |

X
- 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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- Definition This item represents the total fair value of debt securities, categorized neither as held-to-maturity nor trading securities, which have a single maturity date. + References No definition available. + Details
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