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Loans - Summary of loans held for investment (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans | $ 461,516 | $ 415,587
Less: Unearned income | (638) | (719)
Total | 460,878 | 414,868
Commercial and industrial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans | 50,826 | 49,076
Agricultural [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans | 175 | 216
Construction, commercial [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans | 19,876 | 14,666
Construction, residential [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans | 16,364 | 15,102
Mortgage, commercial [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans | 167,223 | 150,513
Mortgage, residential [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans | 165,865 | 149,856
Mortgage, farmland [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans | 3,754 | 4,179
Consumer installment loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans | $ 37,433 | $ 31,979

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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 + Details
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