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Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Amortized Cost    
Due after one year through five years $ 64,365  
Due after five years through ten years 433,463  
Due after ten years 2,329,941  
Total 2,827,769 $ 1,819,901
Fair Value    
Due after one year through five years 64,002  
Due after five years through ten years 411,807  
Due after ten years 2,154,686  
Fair Value 2,630,495 1,778,064
Amortized Cost    
Due in one year or less 7,567  
Due after one year through five years 477,415  
Due after five years through ten years 1,098,144  
Due after ten years 4,731,017  
Amortized Cost 6,314,143 5,221,296
Fair Value    
Due in one year or less 7,590  
Due after one year through five years 471,472  
Due after five years through ten years 1,034,518  
Due after ten years 4,410,626  
Fair Value 5,924,206 $ 5,193,478
Information with respect to sales of available-for-sale securities    
Sale proceeds $ 414,438