Commercial Loan Investments - Additional Information (Detail)	3 Months Ended
Mar. 31, 2016 USD ($) Loan	Dec. 31, 2015 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Commercial loan investments, outstanding	$ 38,343,673	$ 38,331,956
Commercial Mortgage Backed Securities [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of loans owned \| Loan	4
Dallas, TX , Sarasota, FL, Atlanta, GA and San Juan, Puerto Rico [Member] \| Commercial Mortgage Backed Securities [Member]
Accounts Notes And Loans Receivable [Line Items]
Commercial loan investments, outstanding	$ 38,500,000
Commercial loan investments, average remaining maturity	1 year 6 months
Commercial loan investments, weighted average interest rate	9.00%

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of commercial loans and leases receivable including, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Excludes loans and leases covered under loss sharing agreements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

Name:	us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant