v3.3.1.900

Investments - Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |
Due in one year or less | $ 181,769 |
Due after one year through five years | 477,902 |
Due after five years through ten years | 1,238,535 |
Due after ten years | 27,157 |
Total before securities with single maturities, Amortized cost | 1,925,363 |
Amortized Cost | 3,562,864 | $ 3,379,864
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |
Due in one year or less | 180,407 |
Due after one year through five years | 475,103 |
Due after five years through ten years | 1,180,221 |
Due after ten years | 29,562 |
Total before securities with single maturities, Fair value | 1,865,293 |
Fair value | 3,508,088 | 3,456,904
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] |  |
Due in one year or less | 0 |
Due after one year through five years | 67,371 |
Due after five years through ten years | 540,472 |
Due after ten years | 0 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis | 607,843 |
HTM securities, Amortized Cost | 607,843 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due after one year through five years | 66,888 |
Due after five years through ten years | 532,087 |
Due after ten years | 0 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value | 598,975 |
HTM securities, Fair Value | 598,975 | 0
U.S. agency bonds – mortgage-backed |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |
Amortized cost of securities without single maturities | 1,471,782 |
Amortized Cost | 1,471,782 | 1,313,834
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |
Fair value of securities without single maturities | 1,476,991 |
Fair value | 1,476,991 | 1,322,443
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount | 0 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value | 0 |
Asset-backed securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |
Amortized cost of securities without single maturities | 165,719 |
Amortized Cost | 165,719 | 52,337
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |
Fair value of securities without single maturities | 165,804 |
Fair value | 165,804 | $ 54,780
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount | 0 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value | $ 0 |

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- Definition Amount of investment in held-to-maturity debt securities with a single maturity date, after other than temporary impairment (OTTI) accretion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Fair value of investment in held-to-maturity debt securities with a single maturity date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Amount of held-to-maturity debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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