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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Fair Value $ (63,237) $ (46,401)
Notional Amount 4,993,201 6,483,976
Derivative Liabilities    
Derivative [Line Items]    
Fair Value (100,117) (62,794)
Notional Amount 2,340,300 3,083,315
Derivative Liabilities | Interest rate swaps    
Derivative [Line Items]    
Fair Value (24,499) (10,134)
Notional Amount 966,500 1,039,500
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging    
Derivative [Line Items]    
Fair Value (70,672) (48,232)
Notional Amount 139,500 139,500
Derivative Liabilities | TBAs    
Derivative [Line Items]    
Fair Value (4,335) (2,519)
Notional Amount 1,000,000 1,450,500
Derivative Liabilities | Futures    
Derivative [Line Items]    
Fair Value (54) (445)
Notional Amount 15,000 78,000
Derivative Liabilities | Loan purchase commitments    
Derivative [Line Items]    
Fair Value (557) (1,464)
Notional Amount 219,300 375,815
Derivative Assets    
Derivative [Line Items]    
Fair Value 36,880 16,393
Notional Amount 2,652,901 3,400,661
Derivative Assets | Interest rate swaps    
Derivative [Line Items]    
Fair Value 16,839 2,590
Notional Amount 580,000 658,000
Derivative Assets | TBAs    
Derivative [Line Items]    
Fair Value 1,514 2,734
Notional Amount 555,000 1,028,500
Derivative Assets | Futures    
Derivative [Line Items]    
Fair Value 257 0
Notional Amount 130,000 0
Derivative Assets | Swaptions    
Derivative [Line Items]    
Fair Value 12,234 5,191
Notional Amount 495,000 925,000
Derivative Assets | Credit default index swaps    
Derivative [Line Items]    
Fair Value 0 1,207
Notional Amount 0 25,000
Derivative Assets | Loan purchase commitments    
Derivative [Line Items]    
Fair Value 6,036 4,671
Notional Amount $ 892,901 $ 764,161