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Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Impaired loans with no related allowance recorded, carrying amount	$ 1,493	$ 708
Impaired loans with no related allowance recorded, unpaid principal balance	1,493	708
Impaired loans, related allowances	418	166
Impaired loans with no related allowance recorded, carrying amount	4,079	831
Impaired loans with no related allowance recorded, unpaid principal balance	4,079	831
Impaired loans, carrying amount	5,572	1,539
Impaired loans, unpaid principal balance	5,572	1,539
Impaired loans, average recorded investment	2,876	1,460
Impaired loans, interest income recognized	71	65
Impaired loans, interest income received	64	67
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Impaired loans with no related allowance recorded, carrying amount		73
Impaired loans with no related allowance recorded, unpaid principal balance		73
Impaired loans, related allowances		28
Impaired loans with no related allowance recorded, carrying amount		153
Impaired loans with no related allowance recorded, unpaid principal balance		153
Impaired loans, carrying amount		226
Impaired loans, unpaid principal balance		226
Impaired loans, average recorded investment	181	70
Impaired loans, interest income recognized		8
Impaired loans, interest income received		8
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Impaired loans with no related allowance recorded, carrying amount	997	635
Impaired loans with no related allowance recorded, unpaid principal balance	997	635
Impaired loans, related allowances	15	50
Impaired loans with no related allowance recorded, carrying amount	22	57
Impaired loans with no related allowance recorded, unpaid principal balance	22	57
Impaired loans, carrying amount	1,019	692
Impaired loans, unpaid principal balance	1,019	692
Impaired loans, average recorded investment	1,021	794
Impaired loans, interest income recognized	43	16
Impaired loans, interest income received	37	16
Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Impaired loans with no related allowance recorded, carrying amount	496
Impaired loans with no related allowance recorded, unpaid principal balance	496
Impaired loans, related allowances		1
Impaired loans with no related allowance recorded, carrying amount		511
Impaired loans with no related allowance recorded, unpaid principal balance		511
Impaired loans, carrying amount	496	511
Impaired loans, unpaid principal balance	496	511
Impaired loans, average recorded investment	645	523
Impaired loans, interest income recognized	22	34
Impaired loans, interest income received	21	35
Real Estate [Member] | Other Real Estate Loans [Member]
Impaired loans, average recorded investment		1
Commercial and Industrial Loans [Member]
Impaired loans, related allowances	394	67
Impaired loans with no related allowance recorded, carrying amount	4,025	67
Impaired loans with no related allowance recorded, unpaid principal balance	4,025	67
Impaired loans, carrying amount	4,025	67
Impaired loans, unpaid principal balance	4,025	67
Impaired loans, average recorded investment	991	57
Impaired loans, interest income recognized	5	4
Impaired loans, interest income received	5	5
Consumer Portfolio Segment [Member]
Impaired loans, related allowances	9	20
Impaired loans with no related allowance recorded, carrying amount	32	43
Impaired loans with no related allowance recorded, unpaid principal balance	32	43
Impaired loans, carrying amount	32	43
Impaired loans, unpaid principal balance	32	43
Impaired loans, average recorded investment	38	15
Impaired loans, interest income recognized	1	3
Impaired loans, interest income received	$ 1	$ 3

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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