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Commercial Mortgage Loan Portfolio - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses | $ 0 | $ 0 | $ 15,000,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 15,000,000 | $ 0 | $ 0
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 0 |
Terminal capitalization rate |  |  |  |  |  |  |  |  | 11.00% |  |
Discount Rate |  |  |  |  |  |  |  |  | 10.00% |  |
Multifamily - Williston, ND [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | $ 10,000,000 |  |

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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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