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Fair Value Measurements and Fair Values of Financial Instruments (Sensitivity Analysis) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]            
Fair value of SBA Servicing Asset $ 3,075 $ 2,340 $ 2,904 $ 1,911 $ 1,630 $ 1,102
Compositions Of SBA Loans Service For Other Loans 100.00% 100.00%        
Weighted Average Remaining Term 21 years 3 months 18 days 21 years 4 months 24 days        
Prepayment Speed 6.42% 6.59%        
Prepayment Speed: Effect on fair value of a 10% increase (71) (55)        
Prepayment Speed: Effect on fair value of a 20% increase (139) (107)        
Weighted Average Discount Rate 14.01% 14.23%        
Discount Rate: Effect on fair value of a 10% increase (146) (115)        
Discount Rate: Effect on fair value of a 20% increase $ (282) $ (222)        
Fixed Rate SBA Loans [Member]
           
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]            
Compositions Of SBA Loans Service For Other Loans 0.00% 0.00%        
Adjustable Rate SBA Loans [Member]
           
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]            
Compositions Of SBA Loans Service For Other Loans 100.00% 100.00%