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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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