Loans Receivable and Allowance for Loan Losses - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Maximum percentage of loan-to-value ratio upon loan origination	80.00%
Maximum percentage of loan-to-value ratios of the value of the real estate taken as collateral	90.00%
Maximum percentage of credit worthiness of the borrower	43.00%
Minimum amount of loan on which reviews have been made annually	$ 1,000,000
Minimum amount of loan rated as Substandard	250,000
Number of notes split	2
Minimum amount on which annual updated appraisals for criticized loans is required	$ 250,000
Percentage of strong loan-to-value	70.00%
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Rating on loans that are deemed impaired	90 days
Historical loss percentage adjustment to anticipated loss allocation	(1.50%)	(1.50%)
Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Historical loss percentage adjustment to anticipated loss allocation	1.50%	1.50%