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Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Amortized Cost      
Due after one year through five years $ 101,112,000    
Due after five years through ten years 370,429,000    
Due after ten years 2,211,700,000    
Total 2,683,241,000 $ 1,819,901,000  
Fair Value      
Due after one year through five years 93,106,000    
Due after five years through ten years 327,045,000    
Due after ten years 1,830,017,000    
Fair Value 2,250,168,000 1,778,064,000  
Amortized Cost      
Due in one year or less 205,822,000    
Due after one year through five years 387,280,000    
Due after five years through ten years 1,144,740,000    
Due after ten years 4,478,299,000    
Amortized Cost 6,216,141,000 5,221,296,000  
Fair Value      
Due in one year or less 201,700,000    
Due after one year through five years 369,174,000    
Due after five years through ten years 998,177,000    
Due after ten years 3,757,771,000    
Fair Value 5,326,822,000 5,193,478,000  
Information with respect to sales of available-for-sale securities      
Sale proceeds 482,028,000 151,314,000 $ 100,754,000
Gross realized gains 103,000 750,000 662,000
Gross realized losses (73,000) (648,000) (612,000)
Net realized gain 30,000 102,000 50,000
Information with respect to sales of held-to-maturity      
Proceeds from sales of investment securities held to maturity $ 0 $ 0 $ 0