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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, 2021	Dec. 31, 2020
Amortized cost
Amortized cost - Within 1 year	$ 1,225,639
Amortized cost - After 1 to 5 years	10,127,468
Amortized cost - After 5 to 10 years	5,272,106
Amortized cost - After 10 years	8,436,011
Amortized cost	25,061,224
Fair Value
Fair value - Within 1 year	1,239,127
Fair value - After 1 to 5 years	10,163,506
Fair value - After 5 to 10 years	5,254,323
Fair value - After 10 years	8,311,313
Fair Value	$ 24,968,269	$ 21,561,152

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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