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Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Contractual maturity of debt securities      
Total $ 540,475 $ 614,977 $ 607,046
Held for Investment [Member] | Fair Value [Member]
      
Contractual maturity of debt securities      
Within one year 4,069    
After one year but within five years 9,484    
After five years but within ten years 2,878    
After ten years 649    
Total 17,080    
Held for Investment [Member] | Amortized Cost [Member]
      
Contractual maturity of debt securities      
Within one year 4,000    
After one year but within five years 9,355    
After five years but within ten years 2,825    
After ten years 589    
Total 16,769    
Available for Sale [Member] | Fair Value [Member]
      
Available for Sale      
Within one year 118,531    
After one year but within five years 255,416    
After five years but within ten years 43,218    
After ten years 96,185    
Total debt securities 513,350    
Equity securities 10,356    
Total 523,706    
Available for Sale [Member] | Amortized Cost [Member]
      
Available for Sale      
Within one year 117,905    
After one year but within five years 252,639    
After five years but within ten years 41,284    
After ten years 93,419    
Total debt securities 505,247    
Equity securities 8,145    
Total $ 513,392