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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, 2020
Dec. 31, 2019
Amortized cost    
Amortized cost - Within 1 year $ 4,965,664  
Amortized cost - After 1 to 5 years 5,059,318  
Amortized cost - After 5 to 10 years 1,083,476  
Amortized cost - After 10 years 9,927,152  
Amortized Cost 21,035,610 $ 17,542,125
Fair Value    
Fair value - Within 1 year 4,982,300  
Fair value - After 1 to 5 years 5,320,477  
Fair value - After 5 to 10 years 1,142,059  
Fair value - After 10 years 10,116,316  
Fair Value $ 21,561,152 $ 17,648,473