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Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Fair Value $ (32,323) $ (10,380)
Notional Amount 2,725,884 1,488,922
Derivative Assets
    
Derivative [Line Items]    
Fair Value 7,514 7,787
Notional Amount 1,121,914 859,360
Derivative Assets | Interest Rate Swaps
    
Derivative [Line Items]    
Fair Value 4 5,972
Notional Amount 4,000 268,000
Derivative Assets | TBAs
    
Derivative [Line Items]    
Fair Value 3,294 1,138
Notional Amount 498,000 241,000
Derivative Assets | Swaptions
    
Derivative [Line Items]    
Fair Value 1,921 596
Notional Amount 265,000 340,000
Derivative Assets | CMBX
    
Derivative [Line Items]    
Fair Value 588  
Notional Amount 25,000  
Derivative Assets | Loan Purchase Commitments
    
Derivative [Line Items]    
Fair Value 1,707  
Notional Amount 329,914 360
Derivative Assets | Loan forward Sales Commitments
    
Derivative [Line Items]    
Fair Value   81
Notional Amount   10,000
Derivative Liabilities
    
Derivative [Line Items]    
Fair Value (39,837) (18,167)
Notional Amount 1,603,970 629,562
Derivative Liabilities | Interest Rate Swaps
    
Derivative [Line Items]    
Fair Value (1,918) (80)
Notional Amount 291,500 50,500
Derivative Liabilities | TBAs
    
Derivative [Line Items]    
Fair Value (5,540) (661)
Notional Amount 751,500 235,000
Derivative Liabilities | Loan Purchase Commitments
    
Derivative [Line Items]    
Fair Value (45) (379)
Notional Amount 49,565 42,562
Derivative Liabilities | Loan forward Sales Commitments
    
Derivative [Line Items]    
Fair Value (1,121)  
Notional Amount 245,905  
Derivative Liabilities | Futures
    
Derivative [Line Items]    
Fair Value (494) (528)
Notional Amount 126,000 162,000
Derivative Liabilities | Cash Flow Hedging | Interest Rate Swaps
    
Derivative [Line Items]    
Fair Value (30,719) (16,519)
Notional Amount $ 139,500 $ 139,500