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Loans and Allowance for Loan Losses - Summary of Purchased Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | $ 12,605 | $ 19,687
Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 549 | 1,272
Consumer Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 58 | 99
Real Estate [Member] | Construction, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans |  | 1,397
Real Estate [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 4,545 | 6,844
Real Estate [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | $ 7,453 | $ 10,075

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