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Loans and Allowance for Loan Losses - Summary of Purchased Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 12,605	$ 19,687
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	549	1,272
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	58	99
Real Estate [Member] | Construction, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans		1,397
Real Estate [Member] | Mortgage, Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	4,545	6,844
Real Estate [Member] | Mortgage, Residential [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 7,453	$ 10,075

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+ References

No definition available.

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Amount of increase from purchase of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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