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Loans and Allowance for Loan Losses - Summary of Primary Segments of ALLL, Loans Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable Impaired [Line Items] |  |
Allowance, beginning of period | $ 4,572 | $ 3,580
Charge-offs | (1,505) | (961)
Recoveries | 310 | 211
Provision for loan losses | 10,450 | 1,742
Allowance, end of period | 13,827 | 4,572
Individually evaluated for impairment | 144 | 241
Collectively evaluated for impairment | 13,683 | 4,331
Commercial and Industrial [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Allowance, beginning of period | 841 | 572
Charge-offs | (6) | (43)
Recoveries | 41 |
Provision for loan losses | 2,886 | 312
Allowance, end of period | 3,762 | 841
Individually evaluated for impairment | 144 | 143
Collectively evaluated for impairment | 3,618 | 698
Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Allowance, beginning of period | 220 | 112
Provision for loan losses | 740 | 108
Allowance, end of period | 960 | 220
Collectively evaluated for impairment | 960 | 220
Construction, Residential [Member] | Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Allowance, beginning of period | 60 | 56
Provision for loan losses | 90 | 4
Allowance, end of period | 150 | 60
Collectively evaluated for impairment | 150 | 60
Mortgage, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Allowance, beginning of period | 1,604 | 1,180
Charge-offs | (505) | (3)
Provision for loan losses | 3,116 | 427
Allowance, end of period | 4,215 | 1,604
Individually evaluated for impairment |  | 98
Collectively evaluated for impairment | 4,215 | 1,506
Mortgage, Residential [Member] | Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Allowance, beginning of period | 510 | 434
Charge-offs |  | (1)
Recoveries | 8 | 6
Provision for loan losses | 963 | 71
Allowance, end of period | 1,481 | 510
Collectively evaluated for impairment | 1,481 | 510
Mortgage, Farmland [Member] | Real Estate [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Allowance, beginning of period | 9 | 13
Provision for loan losses | 9 | (4)
Allowance, end of period | 18 | 9
Collectively evaluated for impairment | 18 | 9
Consumer Loans [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Allowance, beginning of period | 1,328 | 1,213
Charge-offs | (994) | (914)
Recoveries | 261 | 205
Provision for loan losses | 2,646 | 824
Allowance, end of period | 3,241 | 1,328
Collectively evaluated for impairment | $ 3,241 | $ 1,328

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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