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Derivative Instruments (Details) (USD $)
 6 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2008
Dec. 31, 2013
derivative_instrument
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Interest Rate Floor [Member]
Dec. 31, 2013
Cash Flow Hedging [Member]
Interest Rate Floor [Member]
Derivative [Line Items]              
Interest rate floors notional value           $ 600,000,000 $ 500,000,000
Number of derivatives designated as cash flow hedges     7        
Portfolio of variable-rate loans     500,000,000        
Interest rate floors maturity date       Jun. 30, 2011 May 01, 2008    
Strike rate, lower range     6.00%        
Strike rate, higher range     8.00%        
Interest rate floors matured   150,000,000          
Notional value of interest rate floors sold   450,000,000          
Gain on sale of derivatives $ 16,800,000