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Derivative Financial Instruments (Details) (Non-Hedging Derivative Instruments, USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
PrimeLending
Jun. 30, 2013
PrimeLending
Jun. 30, 2014
PrimeLending
Jun. 30, 2013
PrimeLending
Jun. 30, 2014
FSC
Jun. 30, 2013
FSC
Jun. 30, 2014
FSC
Jun. 30, 2013
FSC
Jun. 30, 2014
Commitments to purchase MBSs
Dec. 31, 2013
Commitments to purchase MBSs
Jun. 30, 2014
Commitments to sell MBSs
Dec. 31, 2013
Commitments to sell MBSs
Jun. 30, 2014
Interest rate lock commitments
Dec. 31, 2013
Interest rate lock commitments
Jun. 30, 2014
Fee Award Option
Dec. 31, 2013
Fee Award Option
Derivative financial instruments                                
Net gain (loss) due to changes in the fair value of the derivative instruments $ (3,600,000) $ 32,000,000 $ (5,200,000) $ 34,000,000 $ 3,200,000 $ 3,800,000 $ 6,100,000 $ 5,600,000                
Notional Amount                 416,294,000 236,305,000 2,303,071,000 1,645,332,000 981,330,000 602,467,000 20,432,000 20,432,000
Estimated Fair Value                 $ 6,870,000 $ (109,000) $ (13,847,000) $ 11,383,000 $ 28,584,000 $ 12,151,000 $ (6,300,000) $ (5,600,000)