Loans Receivable, Net - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended	9 Months Ended			9 Months Ended	3 Months Ended			9 Months Ended
	Sep. 30, 2013 Loan	Dec. 31, 2012 Loan	Sep. 30, 2013 Maximum	Sep. 30, 2013 Minimum	Sep. 30, 2013 Revolving lines of credit	Sep. 30, 2013 Term note	Sep. 30, 2013 Residential loans	Jun. 30, 2013 Residential loans	Sep. 30, 2012 Residential loans	Sep. 30, 2013 Residential loans	Sep. 30, 2012 Residential loans	Sep. 30, 2013 Residential real estate loans	Dec. 31, 2012 Residential real estate loans
Accounts Notes And Loans Receivable [Line Items]
Aggregate carrying value of residential loans sold, including interest and advances								$ 22,100,000
Proceeds from sale of loans held for sale, net	27,073,000							27,100,000
Gain on loans held for sale, net	5,026,000							5,000,000
Pro forma operating revenue adjustment							0		700,000	5,800,000	4,900,000
Pro forma operating costs adjustment							0		18,000	100,000	53,000
Pro forma net loss adjustment									700,000	5,700,000	4,900,000
Pro forma earnings per share adjustment									$ 0.06	$ 0.48	$ 0.42
Loans receivable commitment to lend					7,000,000
Loans receivable, interest rate above prime					2.75%	2.75%
Loans receivable, floor interest rate					5.75%	5.75%
Loans receivable maturity date					Mar. 31, 2017	Mar. 31, 2017
Loans receivable						1,000,000
Loans receivable, first principal due date						Apr. 01, 2015
Recorded Investment-Nonaccrual Loans												0	2,200,000
Total Recorded Investment													22,209,000
Percentage of Nonaccrual Loans		9.10%											10.10%
Loans receivable, net	4,325,000	24,372,000											22,209,000
Impaired financing receivable, average recorded investment	6,500,000	11,900,000
Impaired financing receivable, interest income recognized	300,000	1,200,000
Number of loans receivable, net modified	0	3
Loans receivable, net modified		$ 200,000
Residential real estate loan, maturity period			30 years
Residential real estate loan, amortization period				30 years