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Bank segment - Contractual maturities of investment securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale    
Total amortized cost $ 101,177  
Amortized cost 2,340,488  
Held-to-maturity    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 295,046  
Amortized cost 295,046 $ 226,947
Available-for-sale    
Total fair value 103,905  
Total available-for-sale securities 2,305,257  
Held-to-maturity    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 285,599  
Total held-to-maturity securities 285,599 229,963
American Savings Bank (ASB)    
Available-for-sale    
Due in one year or less 11,996  
Due after one year through five years 43,530  
Due after five years through ten years 30,224  
Due after ten years 15,427  
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 2,239,311  
Amortized cost 2,340,488 1,943,114
Held-to-maturity    
Amortized cost 295,046 226,947
Available-for-sale    
Due in one year or less 12,011  
Due after one year through five years 45,180  
Due after five years through ten years 31,287  
Due after ten years 15,427  
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 2,201,352  
Total available-for-sale securities 2,305,257 1,970,417
Held-to-maturity    
Total held-to-maturity securities $ 285,599 $ 229,963