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Bank subsidiary (Details 6) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Amortized Cost    
Due in one year or less $ 28,120  
Due after one year through five years 37,922  
Due after five years through ten years 85,760  
Due after ten years 25,191  
Total amortized cost 176,993  
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost 359,437  
Total available-for-sale securities, amortized cost 536,430 653,492
Fair value    
Due in one year or less 28,143  
Due after one year through five years 38,324  
Due after five years through ten years 87,192  
Due after ten years 23,628  
Total fair value 177,287  
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value 357,977  
Total available for sale securities $ 535,264 $ 671,358