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Bank subsidiary (Details 5) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Amortized Cost    
Due after one year through five years $ 189,424  
Due after five years through ten years 79,093  
Due after ten years 18,270  
Total amortized cost 286,787  
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost 334,607  
Total available-for-sale securities, amortized cost 621,394 607,918
Fair value    
Due after one year through five years 191,698  
Due after five years through ten years 82,877  
Due after ten years 18,868  
Total fair value 293,443  
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value 345,669  
Total available for sale securities $ 639,112 $ 624,331