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Bank segment - Contractual maturities of securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Amortized Cost    
Due in one year or less $ 0  
Due after one year through five years 87,165  
Due after five years through ten years 78,222  
Due after ten years 20,900  
Total amortized cost 186,287  
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost 800,794  
Total available-for-sale securities, Amortized cost 987,081 $ 823,756
Fair value    
Due in one year or less 0  
Due after one year through five years 88,754  
Due after five years through ten years 79,534  
Due after ten years 21,084  
Total fair value 189,372  
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value 807,612  
Available-for-sale securities $ 996,984 $ 820,648