Loans and Allowance for Loan Losses - Loans By Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable Recorded Investment [Line Items]
Loans	$ 708,894	$ 650,123	$ 639,030
As a percentage of total loans	100.00%	100.00%
Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 58,175		35,472
Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	51,420		49,197
Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	198,745		183,754
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	73,112		95,147
Direct Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	25,845
Branch Retail [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	29,764
Indirect Sales [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	194,154
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	58,175	$ 37,282
Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	51,420	54,326
Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	198,745	184,528
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	73,112	88,856
Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	77,679	81,735	86,898
Consumer Portfolio Segment [Member] | Direct Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	25,845	29,788	30,048
Consumer Portfolio Segment [Member] | Branch Retail [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	29,764	32,094	33,145
Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	194,154	141,514	$ 125,369
FUSB [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	656,938	591,000
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	58,175	37,282
FUSB [Member] | Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	51,420	54,326
FUSB [Member] | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	198,745	184,528
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	70,544	85,271
FUSB [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	6,221	6,344
FUSB [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	194,154	141,514
FUSB [Member] | Pass
Financing Receivable Recorded Investment [Line Items]
Loans	$ 369,818	$ 341,137
As a percentage of total loans	95.80%	95.33%
FUSB [Member] | Pass | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 58,173	$ 36,719
FUSB [Member] | Pass | Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	48,882	54,326
FUSB [Member] | Pass | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	187,183	170,338
FUSB [Member] | Pass | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	75,580	79,754
FUSB [Member] | Special Mention
Financing Receivable Recorded Investment [Line Items]
Loans	$ 13,415	$ 9,672
As a percentage of total loans	3.48%	2.70%
FUSB [Member] | Special Mention | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans		$ 558
FUSB [Member] | Special Mention | Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 2,538
FUSB [Member] | Special Mention | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	10,525	8,572
FUSB [Member] | Special Mention | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	352	542
FUSB [Member] | Substandard
Financing Receivable Recorded Investment [Line Items]
Loans	$ 2,786	$ 7,062
As a percentage of total loans	0.72%	1.97%
FUSB [Member] | Substandard | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 2	$ 5
FUSB [Member] | Substandard | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	1,037	5,618
FUSB [Member] | Substandard | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	1,747	1,439
FUSB [Member] | Pass And Criticized [Member}
Financing Receivable Recorded Investment [Line Items]
Loans	$ 386,019	$ 357,871
As a percentage of total loans	100.00%	100.00%
FUSB [Member] | Pass And Criticized [Member} | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 58,175	$ 37,282
FUSB [Member] | Pass And Criticized [Member} | Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	51,420	54,326
FUSB [Member] | Pass And Criticized [Member} | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	198,745	184,528
FUSB [Member] | Pass And Criticized [Member} | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	77,679	81,735
ALC [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	51,956	59,123
ALC [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	$ 321,482	$ 289,674
As a percentage of total loans	99.57%	99.12%
ALC [Member] | Nonperforming Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	$ 1,393	$ 2,578
As a percentage of total loans	0.43%	0.88%
ALC [Member] | Performing And Non Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 322,875	$ 292,252
As a percentage of total loans	100.00%	100.00%
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 2,568	$ 3,585
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	71,846	86,665
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Nonperforming Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	1,266	2,191
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Performing And Non Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	73,112	88,856
ALC [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	19,624	23,444
ALC [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	25,733	29,679
ALC [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member] | Nonperforming Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	112	109
ALC [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member] | Performing And Non Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	25,845	29,788
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	29,764	32,094
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	29,758	31,816
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Nonperforming Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	6	278
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Performing And Non Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	29,764	32,094
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	194,145	141,514
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Nonperforming Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans	9
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect Sales [Member] | Performing And Non Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 194,154	$ 141,514