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Allowance for Loans Losses - Summary of purchased loans (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 25,091	$ 34,672
Commercial and Industrial [member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	2,906	4,457
Other revolving credit plans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	37	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	68	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	1,415	1,522
Secured by farmland [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	3	319
Secured by 1-4 family residential [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	2,814	3,376
Secured by first liens [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	7,803	10,448
Secured by junior liens [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	399	505
Secured by multifamily [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	95	250
Loans secured by owner-occupied, nonfarm nonresidential properties [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	4,146	7,344
Loans secured by other nonfarm nonresidential properties [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Purchase loans	$ 5,395	$ 6,239

X

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+ References

No definition available.

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- Definition

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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