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Securities Held-to-Maturity - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Securities	Dec. 31, 2019 USD ($) Securities
Investments, Debt and Equity Securities [Abstract]
Number of securities determined to be other than temporarily impaired | Securities	0	0
Proceeds from Sale and Maturity of Held-to-maturity Securities | $	$ 16,488	$ 3,244

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- Definition

Amount of cash inflow from the sale or maturity of long-term held-to-maturity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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Number of securities determined to be other than temporarily impaired.

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