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Bank segment - Contractual maturities of securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Available-for-sale Securities, Debt Maturities [Abstract]    
Due in one year or less $ 65,330  
Due after one year through five years 44,570  
Due after five years through ten years 33,462  
Due after ten years 15,427  
Total amortized cost 158,789  
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,201,796  
Amortized cost 1,360,585 $ 1,229,438
Held-to-Maturity, Debt Securities, Amortized Cost [Abstract]    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 124,623  
Amortized cost 124,623 139,451
Available-for-sale Securities, Debt Securities, Fair Value [Abstract]    
Due in one year or less 65,776  
Due after one year through five years 46,378  
Due after five years through ten years 35,067  
Due after ten years 15,427  
Total fair value 162,648  
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,226,985  
Total available-for-sale securities 1,389,633 1,232,826
Held-to-maturity Securities, Debt Securities, Fair Value [Abstract]    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 131,131  
Total held-to-maturity securities $ 131,131 $ 143,467