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Loans and Allowance for Loan Losses - Summary of Purchased Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 19,686	$ 34,672
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	1,272	4,457
Other Revolving Credit Plans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	26	89
Automobile Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	10	30
Other Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	63	93
Construction Loans and All Land Development and Other Land Loans [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	1,397	1,522
Secured by Farmland [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans		319
Secured by 1-4 Family Residential [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	2,709	3,376
Secured by First Liens [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	6,971	10,448
Secured by Junior Liens [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	394	505
Secured by Multifamily [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	63	250
Loans Secured by Owner-Occupied, Nonfarm Nonresidential Properties [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	4,459	7,344
Loans Secured by Other Nonfarm Nonresidential Properties [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 2,322	$ 6,239

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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=119407570&loc=SL82919244-210447

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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