Discontinued Operations - Additional Information (Detail) (USD $)	1 Months Ended							3 Months Ended		9 Months Ended
	Jul. 26, 2013	Sep. 30, 2013 Property	Dec. 31, 2012 Property	Sep. 30, 2013 Outstanding Claims For More Than Sixty Months	Sep. 30, 2013 Outstanding Claims For More Than Thirty Six But Less Than Sixty Months	Sep. 30, 2013 Outstanding Claims For More Than Twenty Four But Less Than Thirty Six Months	Sep. 30, 2013 Minimum	Sep. 30, 2013 Discontinued Operations	Sep. 30, 2012 Discontinued Operations	Sep. 30, 2013 Discontinued Operations	Sep. 30, 2012 Discontinued Operations	Dec. 31, 2012 Discontinued Operations	Sep. 30, 2013 Discontinued Operations Investment interest	Dec. 31, 2012 Discontinued Operations Investment interest	Sep. 30, 2013 Discontinued Operations Prepaid expenses and deposits	Dec. 31, 2012 Discontinued Operations Prepaid expenses and deposits
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash received from redemption of FHLB stock	$ 2,100,000
Number of real estate owned properties		1	7
Other asset													32,000	51,000	45,000	47,000
Loans originated from 2002 through Q1-2007, subject to representations and warranties							120,000,000,000
Mortgage loan repurchase claims outstanding		101,700,000		63,100,000	10,300,000	28,300,000
Mortgage loan repurchase claims outstanding, percentage				62.00%	10.20%	27.80%
Repurchase reserve								6,750,000		6,750,000		7,500,000
Recoveries of provisions for repurchases								$ 200,000	$ 200,000	$ 700,000	$ 700,000