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Debt Securities - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2016 USD ($) | Feb. 28, 2015 USD ($) | Aug. 31, 2014 USD ($) option | May 31, 2014 USD ($) ft² casino room timeshare_unit | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Realized loss on sale of securities |  |  |  |  | $ 225,000 | $ 0 | $ 225,000 | $ 443,000 |
Hotel [Member] | 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 [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] |  |  |  |  |  |  |  |  |
Amortized cost of debt securities sold | $ 86,676,000 | $ 24,038,000 |  |  |  |  |  |  |
Realized loss on sale of securities | 225,000 | 443,000 |  |  |  |  |  |  |
Realized gain on sale of debt securities | 90,000 | 43,000 |  |  |  |  |  |  |
Realized loss on sale of debt securities | 315,000 | 486,000 |  |  |  |  |  |  |
Reclassification out of accumulated other comprehensive income |  | 678,000 |  |  |  |  |  |  |
Proceeds from sale of debt securities, net of debt facility repayment |  | 1,341,000 |  |  |  |  |  |  |
Line of Credit [Member] | Wells Fargo [Member] |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Repayment of debt facility | $ 70,229,000 | $ 22,254,000 |  |  |  |  |  |  |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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=73527792&loc=d3e27357-111563 + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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