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Debt Securities Available for Sale - Aggregate Amortized Cost and Fair Value of AFS by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amortized cost    
Amortized cost - Within 1 year $ 5,140,920  
Amortized cost - After 1 to 5 years 5,235,233  
Amortized cost - After 5 to 10 years 2,214,020  
Amortized cost - After 10 years 4,951,952  
Amortized Cost 17,542,125 $ 13,478,562
Fair Value    
Fair value - Within 1 year 5,143,596  
Fair value - After 1 to 5 years 5,308,166  
Fair value - After 5 to 10 years 2,207,351  
Fair value - After 10 years 4,989,360  
Fair Value $ 17,648,473 $ 13,300,184