Geographic Concentration of Residential Loans Recorded on Consolidated Balance Sheet (Parenthetical) (Detail) (Maximum, Other states)	Dec. 31, 2013	Dec. 31, 2012
Residential Loans Held For Sale
Concentration Risk [Line Items]
Concentration risk percentage per other state	5.00%	5.00%
Residential Loans Held for Investment
Concentration Risk [Line Items]
Concentration risk percentage per other state	5.00%	5.00%