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Securities - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2014 USD ($) option | May 31, 2014 USD ($) ft² room casino timeshare_unit | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2014 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Realized loss on sale of securities |  |  | $ 1,042,000 | $ 0 |  |
Hotel | Subordinate Mortgage Portfolio Segment [Member] | Hotel - Aruba [Member] |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Property size, number of units/keys | 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 |  |  |  |
Term of loan | 3 years |  |  |  |  |
Number of options to extend loan agreement | option | 2 |  |  |  |  |
Option to extend loan agreement, term | 1 year |  |  |  |  |
Appraised loan to value ratio | 60.00% |  |  |  |  |
First Mortgage [Member] | Hotel | 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 | 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 | 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 |  |  | $ 1,001,000 |  | $ 1,470,000 |

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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=73527792&loc=d3e27357-111563 + Details
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