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Short-Term Debt by Weighted Average Interest Rates and Collateral Type (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Amount Borrowed $ 1,887,688 $ 862,763
Weighted Average Interest Rate 1.69% 1.42%
Weighted Average Days Until Maturity 154 days 61 days
Residential Loans
    
Short-term Debt [Line Items]    
Amount Borrowed 1,188,179 184,789
Weighted Average Interest Rate 1.71% 1.71%
Weighted Average Days Until Maturity 216 days 228 days
Commercial Loans
    
Short-term Debt [Line Items]    
Amount Borrowed 52,895  
Weighted Average Interest Rate 5.15%  
Weighted Average Days Until Maturity 359 days  
Real Estate Securities
    
Short-term Debt [Line Items]    
Amount Borrowed $ 646,614 $ 677,974
Weighted Average Interest Rate 1.37% 1.34%
Weighted Average Days Until Maturity 23 days 15 days