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Bank segment - Contractual maturities of investment securities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Available-for-sale          
Due in one year or less $ 0   $ 0    
Due after one year through five years 76,247   76,247    
Due after five years through ten years 45,268   45,268    
Due after ten years 15,427   15,427    
Total amortized cost 136,942   136,942    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 2,471,650   2,471,650    
Amortized cost 2,608,592   2,608,592    
Held-to-maturity          
Due in one year or less 0   0    
Due after one year through five years 0   0    
Due after five years through ten years 40,064   40,064    
Due after ten years 0   0    
Total amortized cost 40,064   40,064    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 451,807   451,807    
Amortized cost 491,871   491,871    
Available-for-sale          
Due in one year or less 0   0    
Due after one year through five years 78,071   78,071    
Due after five years through ten years 45,649   45,649    
Due after ten years 15,427   15,427    
Total fair value 139,147   139,147    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 2,441,683   2,441,683    
Total available-for-sale securities 2,580,830   2,580,830   $ 1,970,417
Held-to-maturity          
Due in one year or less 0   0    
Due after one year through five years 0   0    
Due after five years through ten years 40,151   40,151    
Due after ten years 0   0    
Total fair value 40,151   40,151    
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies 444,503   444,503    
Total held-to-maturity securities 484,654   484,654    
Proceeds, gross gains and losses from sales of available-for-sale securities          
Proceeds 0 $ 0 197,354 $ 169,157  
Gross gains 0 0 975 9,312  
Gross losses 0 0 447 37  
Tax expense on realized gains $ 0 $ 0 $ 142 $ 2,492