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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, 2023	Dec. 31, 2022
Amortized cost
Amortized cost - Within 1 year	$ 7,105,166
Amortized cost - After 1 to 5 years	3,699,918
Amortized cost - After 5 to 10 years	1,120,446
Amortized cost - After 10 years	6,175,633
Amortized cost	18,101,163
Fair Value
Fair value - Within 1 year	7,046,274
Fair value - After 1 to 5 years	3,525,430
Fair value - After 5 to 10 years	1,037,788
Fair value - After 10 years	5,119,552
Fair Value	$ 16,729,044	$ 17,804,374

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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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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Fair value 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).

+ References

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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 second through fifth 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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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