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Securities - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2014 USD ($) ft² timeshare_unit room casino | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Aug. 31, 2014 USD ($) | Jun. 30, 2014 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Realized loss on sale of securities |  | $ 0 | $ 0 | $ 1,042,000 | $ 0 |  |
Hotel [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Number of hotel rooms | room | 442 |  |  |  |  |  |
Number of timeshare units in real estate property | timeshare_unit | 114 |  |  |  |  |  |
Number of casinos in real estate property | casino | 2 |  |  |  |  |  |
Property size, area (in square feet) | ft² | 131,500 |  |  |  |  |  |
First Mortgage [Member] | Hotel [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage loan, face amount | $ 155,000,000 |  |  |  |  |  |
Senior Participation [Member] | Hotel [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Participation in loan, amount |  |  |  |  |  | $ 90,000,000 | $ 90,000,000
Junior Participation [Member] | Hotel [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Participation in loan, amount |  |  |  |  |  | $ 65,000,000 | $ 65,000,000
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Realized loss on sale of securities |  |  |  | $ 1,042,000 |  |  |

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- Definition Mortgage Loans on Real Estate, Number of Casinos in Real Estate Property + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Number of Keys in Real Estate Property + References No definition available. + Details
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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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