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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
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Allowance, beginning of period | $ 3,580 | $ 2,802
Charge-offs | (961) | (563)
Recoveries | 211 | 116
Provision for loan losses | 1,742 | 1,225
Allowance, end of period | 4,572 | 3,580
Individually evaluated for impairment | 241 |
Collectively evaluated for impairment | 4,331 | 3,580
Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance, beginning of period | 572 | 494
Charge-offs | (43) | (5)
Provision for loan losses | 312 | 83
Allowance, end of period | 841 | 572
Individually evaluated for impairment | 143 |
Collectively evaluated for impairment | 698 | 572
Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance, beginning of period | 112 | 93
Provision for loan losses | 108 | 19
Allowance, end of period | 220 | 112
Collectively evaluated for impairment | 220 | 112
Construction, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance, beginning of period | 56 | 36
Provision for loan losses | 4 | 20
Allowance, end of period | 60 | 56
Collectively evaluated for impairment | 60 | 56
Mortgage, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance, beginning of period | 1,180 | 809
Charge-offs | (3) |
Recoveries |  | 12
Provision for loan losses | 427 | 359
Allowance, end of period | 1,604 | 1,180
Individually evaluated for impairment | 98 |
Collectively evaluated for impairment | 1,506 | 1,180
Mortgage, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance, beginning of period | 434 | 405
Charge-offs | (1) | (13)
Recoveries | 6 |
Provision for loan losses | 71 | 42
Allowance, end of period | 509 | 434
Collectively evaluated for impairment | 509 | 434
Agricultural and Farmland [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance, beginning of period | 13 | 13
Provision for loan losses | (4) |
Allowance, end of period | 9 | 13
Collectively evaluated for impairment | 9 | 13
Consumer Installment Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance, beginning of period | 1,213 | 952
Charge-offs | (914) | (545)
Recoveries | 205 | 104
Provision for loan losses | 824 | 702
Allowance, end of period | 1,329 | 1,213
Collectively evaluated for impairment | $ 1,330 | $ 1,213

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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=118936363&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=118936363&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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=118936363&loc=SL6953423-111524 + Details
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