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Securities - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 31, 2014 | Jun. 30, 2014 | May 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) on sale of securities | $ (37,575,000) | $ (4,076,000) | $ 0 | $ (1,042,000) | $ 4,059,000 | $ (225,000) | $ 0 | $ 0 | $ (42,693,000) | $ 3,834,000 | $ (443,000) |  |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) on sale of securities |  |  |  |  |  |  |  |  | $ (42,693,000) | $ 1,470,000 |  |  |  |
Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member] | First Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 155,000,000
Senior Participation [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Participations sold |  |  |  |  |  |  |  |  |  |  |  | $ 90,000,000 | $ 90,000,000 |
Junior Participation [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Participations sold |  |  |  |  |  |  |  |  |  |  |  | $ 65,000,000 | $ 65,000,000 |

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of the contractual principal due at the origination of the mortgage loan (face amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition The aggregate amount of the participating mortgage obligation at the end of the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=29639217&loc=d3e10013-112621 + Details
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