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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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