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Allowance for Loans Losses - Summary of Purchased Loans (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 14,910	$ 19,686
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	906	1,272
Other Revolving Credit Plans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	19	26
Automobile Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	8	10
Other Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	53	63
Construction Loans and All Land Development and Other Land Loans [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	908	1,397
Secured by 1-4 Family Residential [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	2,631	2,709
Secured by First Liens [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	5,896	6,971
Secured by Junior Liens [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	385	394
Secured by Multifamily [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	58	63
Loans Secured by Owner-Occupied, Nonfarm Nonresidential Properties [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 4,046	4,459
Loans Secured by Other Nonfarm Nonresidential Properties [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans		$ 2,322

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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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