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Summary of Significant Accounting Policies - Additional information (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Significant Accounting Policies [Line Items]      
Reserve and clearing requirement balance $ 0    
Effect of derivative instrument 0 9,000  
Servicing assets:      
Payment of cash dividends on Preferred Stock 0 3,600,000  
Payments of cash dividends on Common Stock 19,700,000 3,900,000  
Common stock dividends declared, but unpaid 0 0  
Computer equipment
      
Schedule of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful lives 5 years    
Computer software
      
Schedule of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful lives 3 years    
SBA loans
      
Servicing assets:      
Servicing assets capitalized during the period 4,700,000 2,000,000 1,300,000
Amortization of servicing assets during the period 2,014,000 1,347,000 706,000
Carrying value of servicing asset $ 8,900,000 $ 6,300,000  
Minimum | Buildings
      
Schedule of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful lives 15 years    
Minimum | Furniture , fixture and equipment
      
Schedule of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful lives 3 years    
Maximum | Buildings
      
Schedule of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful lives 30 years    
Maximum | Furniture , fixture and equipment
      
Schedule of Significant Accounting Policies [Line Items]      
Premises and equipment, estimated useful lives 7 years    
3- Month London Interbank Offered Rate (LIBOR)
      
Schedule of Significant Accounting Policies [Line Items]      
Strike level of interest rate cap agreement 2.00%    
Interest rate cap
      
Schedule of Significant Accounting Policies [Line Items]      
Interest rate cap agreement terms 3 years