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Debt Securities Held-to-maturity - Aggregate Amortized Cost and Fair Value of HTMS by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Held-to-maturity Securities, Classified [Abstract] |  |
Amortized cost - Within 1 year | $ 3,990 |
Amortized cost - After 1 to 5 years | 16,061 |
Amortized cost - After 5 to 10 years | 14,845 |
Amortized cost - After 10 years | 57,725 |
Amortized Cost | 92,621 | $ 97,662
Fair Value - within 1 year | 3,987 |
Fair Value - After 1 to 5 years | 16,062 |
Fair Value - After 5 to 10 years | 14,544 |
Fair Value - After 10 years | 60,298 |
Fair value | $ 94,891 | $ 105,110

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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(3) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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