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Marketable Securities - Credit Quality of Held To Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Held-to-maturity securities $ 923,180 $ 768,154
Residential mortgage-backed securities    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Held-to-maturity securities 798,728 $ 643,703
U.S. government and agencies    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Held-to-maturity securities 124,452  
AA+    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Held-to-maturity securities 923,180  
AA+ | Residential mortgage-backed securities    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Held-to-maturity securities 798,728  
AA+ | U.S. government and agencies    
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]    
Held-to-maturity securities $ 124,452