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Investment Securities - Additional Information (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
security
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]            
Carrying value of securities pledged as collateral $ 461,303,000     $ 461,303,000   $ 373,533,000
Book value of securities sold under agreements to repurchase 114,070,000     114,070,000   126,900,000
Gain on sale of securities 910,000      2,335,000 487,000  
Number of securities remaining after sale   2        
Investment amortized cost 1,173,850,000     1,173,850,000   1,097,226,000
Minimum
           
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]            
Spread over LIBOR       0.85%    
Maximum
           
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]            
Spread over LIBOR       1.57%    
Corporate obligations
           
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]            
Number of securities sold   4        
Number of securities owned   6        
Amortized cost of sold securities   4,800,000        
Gain on sale of securities   641,000        
Investment amortized cost   1,500,000        
Fair value of investments   $ 821,000        
Corporate obligations | Maximum
           
Schedule of Available for sale Securities and Held to maturity Securities [Line Items]            
Percentage of fair value of investments (less than 1%)   1.00%