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Bank segment - Contractual maturities of securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Available-for-sale Securities, Debt Maturities [Abstract]    
Due in one year or less $ 16,952  
Due after one year through five years 41,941  
Due after five years through ten years 32,238  
Due after ten years 27,185  
Total amortized cost 118,316  
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,598,949  
Amortized cost 1,717,265 $ 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 133,858  
Amortized cost 133,858 139,451
Available-for-sale Securities, Debt Securities, Fair Value [Abstract]    
Due in one year or less 17,193  
Due after one year through five years 43,735  
Due after five years through ten years 33,997  
Due after ten years 27,185  
Total fair value 122,110  
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 1,625,548  
Total available-for-sale securities 1,747,658 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 138,622  
Total held-to-maturity securities $ 138,622 $ 143,467