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Derivative Financial Instruments and Hedging Activities - Schedule of Changes in Notional Balance of Holdings of Derivatives (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Interest Rate Lock Commitments [Member]
Dec. 31, 2012
Interest Rate Lock Commitments [Member]
Sep. 30, 2013
U S Treasury Futures [Member]
Dec. 31, 2012
U S Treasury Futures [Member]
Sep. 30, 2013
Forward Mortgage Backed Securities Trades [Member]
Dec. 31, 2012
Forward Mortgage Backed Securities Trades [Member]
Sep. 30, 2013
Interest Rate Cap [Member]
Dec. 31, 2012
Interest Rate Cap [Member]
Sep. 30, 2013
Interest Rate Swap [Member]
Dec. 31, 2012
Interest Rate Swap [Member]
Derivative Notional Balance [Roll Forward]                        
Notional Amount, beginning balance     $ 1,112,519   $ 109,000   $ 1,638,979   $ 1,025,000   $ 1,495,955  
Derivative Additions     5,887,759   85,000   10,578,176   1,900,000   1,280,000  
Amortization Of Derivative     (228,806)   0   (33,372)   (56,000)   0  
Derivative Maturities     (5,124,849)   0   (4,156,314)   0   (295,604)  
Derivative Terminations     (895,187)   (194,000)   (7,076,821)   (1,001,000)   (2,480,351)  
Notional Amount, ending balance     751,436   0   950,648   1,868,000   0  
Fair value of derivative assets (liabilities) at:                        
Derivative, Fair Value, Net $ 15,494 [1] $ 10,795 [1] $ 5,781 $ 8,433 $ (1,258) $ 0 $ (1,719) $ 6,905 $ 168 $ 442 $ (10,836) $ 0
Derivative Maturity Period     Jan. 2014 - Apr. 2014       Jan. 2014 - Feb. 2014   Nov. 2016      
[1] See Note 19 — Derivative Financial Instruments and Hedging Activities for additional information regarding derivatives.