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Bank segment - Contractual maturities of securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Amortized Cost    
Due in one year or less $ 0  
Due after one year through five years 111,299  
Due after five years through ten years 66,398  
Due after ten years 38,019  
Total amortized cost 215,716  
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost 681,354  
Total available-for-sale securities, Amortized cost 897,070 $ 823,756
Fair value    
Due in one year or less 0  
Due after one year through five years 112,991  
Due after five years through ten years 67,413  
Due after ten years 38,293  
Total fair value 218,697  
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value 687,598  
Available-for-sale securities $ 906,295 $ 820,648