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Investment Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortized Cost    
Due after five years through ten years $ 103,666  
Due after ten years 1,110,647  
Total 1,214,313 $ 955,542
Fair Value    
Due after five years through ten years 99,660  
Due after ten years 1,081,102  
Fair Value 1,180,762 957,183
Amortized Cost    
Due in one year or less 6,546  
Due after one year through five years 90,961  
Due after five years through ten years 556,874  
Due after ten years 3,238,264  
Amortized Cost 3,892,645 3,268,037
Fair Value    
Due in one year or less 6,581  
Due after one year through five years 93,481  
Due after five years through ten years 561,777  
Due after ten years 3,229,651  
Fair Value $ 3,891,490 $ 3,330,672