Allowance for Loan Losses - Additional Information (Detail) (USD $)			3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Residential Real Estate Loans Held for Investment CreditScore	Jun. 30, 2010 Residential Real Estate Loans Held for Investment	Jun. 30, 2011 Residential Real Estate Loans Held for Investment CreditScore	Jun. 30, 2010 Residential Real Estate Loans Held for Investment	Jun. 30, 2011 Residential Real Estate Loans Held for Investment First Mortgage	Jun. 30, 2011 Residential Real Estate Loans Held for Investment Second Mortgage	Jun. 30, 2011 REO	Jun. 30, 2010 REO	Jun. 30, 2011 REO	Jun. 30, 2010 REO	Jun. 30, 2011 Commercial Real Estate Loans Held For Investment	Dec. 31, 2010 Commercial Real Estate Loans Held For Investment	Jun. 30, 2011 Commercial Real Estate Loans Held For Investment Originated During 2011	Jun. 30, 2011 Commercial Real Estate Loans Held For Investment Originated During 2010	Dec. 31, 2010 Commercial Real Estate Loans Held For Investment Originated During Fourth Quarter Of 2010	Dec. 31, 2010 Commercial Real Estate Loans Held For Investment Originated During 2004
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs, net			$ 2,197,000	$ 4,012,000	$ 4,515,000	$ 6,539,000
Principal value									7,000,000	13,000,000	15,000,000	21,000,000
Percentage of loan portfolio							99.00%	1.00%							57.00%	43.00%	99.00%	1.00%
Weighted average original loan-to-value (LTV)			66.00%		66.00%
Weighted average original Fair Isaac Corporation (FICO) score			736		736
Commercial real estate loans	$ 83,866,000	$ 50,386,000											$ 71,168,000	$ 30,536,000