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Allowance for Loans Losses - Summary of accounts notes loans and financing receivable (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 461,516 | $ 415,587
Less: Unearned income | (638) | (719)
Total | 460,878 | 414,868
Grade 1 Prime [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 2,268 | 1,966
Grade 2 Desirable [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 7,294 | 8,940
Grade 3 Good [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 225,007 | 208,644
Grade 4 Acceptable [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 200,589 | 167,948
Grade 5 Pass/Watch [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 19,174 | 19,039
Grade 6 Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,108 | 2,190
Grade 7 Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 6,076 | 6,860
Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Loss [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 0 | 0
Commercial and industrial [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 50,826 | 49,076
Commercial and industrial [Member] | Grade 1 Prime [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 406 | 44
Commercial and industrial [Member] | Grade 2 Desirable [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,827 | 2,660
Commercial and industrial [Member] | Grade 3 Good [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 21,936 | 21,009
Commercial and industrial [Member] | Grade 4 Acceptable [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 25,540 | 24,254
Commercial and industrial [Member] | Grade 5 Pass/Watch [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 579 | 797
Commercial and industrial [Member] | Grade 7 Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 538 | 312
Agricultural [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 175 | 216
Agricultural [Member] | Grade 1 Prime [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans |  | 9
Agricultural [Member] | Grade 2 Desirable [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 103 | 99
Agricultural [Member] | Grade 3 Good [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 66 | 105
Agricultural [Member] | Grade 4 Acceptable [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 6 | 3
Construction, commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 19,876 | 14,666
Construction, commercial [Member] | Grade 2 Desirable [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 659 | 485
Construction, commercial [Member] | Grade 3 Good [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 10,210 | 7,118
Construction, commercial [Member] | Grade 4 Acceptable [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 7,923 | 5,937
Construction, commercial [Member] | Grade 5 Pass/Watch [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 104 | 106
Construction, commercial [Member] | Grade 7 Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 980 | 1,020
Construction, residential [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 16,364 | 15,102
Construction, residential [Member] | Grade 3 Good [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 4,295 | 4,305
Construction, residential [Member] | Grade 4 Acceptable [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 8,011 | 5,059
Construction, residential [Member] | Grade 5 Pass/Watch [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 4,058 | 5,738
Mortgage, commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 167,223 | 150,513
Mortgage, commercial [Member] | Grade 2 Desirable [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,656 | 1,920
Mortgage, commercial [Member] | Grade 3 Good [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 81,973 | 82,097
Mortgage, commercial [Member] | Grade 4 Acceptable [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 70,093 | 53,487
Mortgage, commercial [Member] | Grade 5 Pass/Watch [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 10,226 | 8,470
Mortgage, commercial [Member] | Grade 6 Special Mention [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,012 | 1,668
Mortgage, commercial [Member] | Grade 7 Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 2,263 | 2,871
Mortgage, residential [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 165,865 | 149,856
Mortgage, residential [Member] | Grade 2 Desirable [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 2,917 | 3,647
Mortgage, residential [Member] | Grade 3 Good [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 81,246 | 76,496
Mortgage, residential [Member] | Grade 4 Acceptable [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 76,351 | 63,397
Mortgage, residential [Member] | Grade 5 Pass/Watch [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 3,648 | 3,805
Mortgage, residential [Member] | Grade 6 Special Mention [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 96 | 522
Mortgage, residential [Member] | Grade 7 Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,607 | 1,989
Mortgage, farmland [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 3,754 | 4,179
Mortgage, farmland [Member] | Grade 1 Prime [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,565 | 1,700
Mortgage, farmland [Member] | Grade 2 Desirable [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 100 | 100
Mortgage, farmland [Member] | Grade 3 Good [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,418 | 1,340
Mortgage, farmland [Member] | Grade 4 Acceptable [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 218 | 730
Mortgage, farmland [Member] | Grade 5 Pass/Watch [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 453 |
Mortgage, farmland [Member] | Grade 7 Substandard [Member] | Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans |  | 309
Consumer installment loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 37,433 | 31,979
Consumer installment loans [Member] | Grade 1 Prime [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 297 | 213
Consumer installment loans [Member] | Grade 2 Desirable [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 32 | 29
Consumer installment loans [Member] | Grade 3 Good [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 23,863 | 16,174
Consumer installment loans [Member] | Grade 4 Acceptable [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 12,447 | 15,081
Consumer installment loans [Member] | Grade 5 Pass/Watch [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 106 | 123
Consumer installment loans [Member] | Grade 7 Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 688 | $ 359

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