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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

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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