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Short-Term Debt by Weighted Average Interest Rates and Collateral Type (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Amount Borrowed $ 1,718,430 $ 862,763
Weighted Average Interest Rate 1.52% 1.42%
Weighted Average Days Until Maturity 78 days 61 days
Residential Loans
    
Short-term Debt [Line Items]    
Amount Borrowed 852,267 184,789
Weighted Average Interest Rate 1.72% 1.71%
Weighted Average Days Until Maturity 138 days 228 days
Commercial Loans
    
Short-term Debt [Line Items]    
Amount Borrowed 12,413  
Weighted Average Interest Rate 2.40%  
Weighted Average Days Until Maturity 300 days  
Real Estate Securities
    
Short-term Debt [Line Items]    
Amount Borrowed $ 853,750 $ 677,974
Weighted Average Interest Rate 1.31% 1.34%
Weighted Average Days Until Maturity 16 days 15 days