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Bank segment (Details 5) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Amortized Cost    
Due in one year or less $ 0  
Due after one year through five years 44,498  
Due after five years through ten years 37,332  
Due after ten years 25,242  
Total amortized cost 107,072  
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost 427,804  
Total available-for-sale securities, Amortized cost 534,876 535,090
Fair value    
Due in one year or less 0  
Due after one year through five years 44,419  
Due after five years through ten years 37,641  
Due after ten years 24,236  
Total fair value 106,296  
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value 425,307  
Available-for-sale securities $ 531,603 $ 529,007