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Bank segment - Contractual maturities of securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Available-for-sale Securities, Debt Maturities [Abstract]    
Due in one year or less $ 12,062  
Due after one year through five years 126,045  
Due after five years through ten years 54,880  
Due after ten years 15,427  
Total amortized cost 208,414  
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,090,729  
Amortized cost 1,299,143 $ 1,421,897
Held-to-Maturity, Debt Securities, Amortized Cost [Abstract]    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 137,029  
Amortized cost 137,029 141,875
Available-for-sale Securities, Debt Securities, Fair Value [Abstract]    
Due in one year or less 12,076  
Due after one year through five years 127,461  
Due after five years through ten years 55,559  
Due after ten years 15,427  
Total fair value 210,523  
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,087,487  
Total available-for-sale securities 1,298,010 1,388,533
Held-to-maturity Securities, Debt Securities, Fair Value [Abstract]    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 141,231  
Total held-to-maturity securities $ 141,231 $ 142,057