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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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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.

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