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Loans and Allowance for Loan and Lease Losses - Loans By Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021
Financing Receivable Recorded Investment [Line Items]
Loans	$ 680,068	$ 710,944		$ 670,497
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	$ 52,817			48,491
Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	50,796			54,180
Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	177,752			193,626
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	69,760			82,349
Direct Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	18,023
Indirect [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	220,931
Branch Retail [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	21,891
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	52,817	$ 67,048
Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	50,796	46,000
Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	177,752	197,901
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	69,760	72,727
Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	68,098	73,947		79,838
Consumer Portfolio Segment [Member] | Direct Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	18,023	21,689		26,998
Consumer Portfolio Segment [Member] | Indirect [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	220,931	205,940		153,940
Consumer Portfolio Segment [Member] | Branch Retail [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	21,891	25,692		$ 31,075
FUSB [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	644,290	667,247
FUSB [Member] | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	52,817	67,048
FUSB [Member] | Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	50,796	46,000
FUSB [Member] | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	177,752	197,901
FUSB [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	67,705	70,439
FUSB [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	6,191	5,972
FUSB [Member] | Consumer Portfolio Segment [Member] | Indirect [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	220,931	205,940
FUSB [Member] | Pass
Financing Receivable Recorded Investment [Line Items]
Loans	$ 344,144	$ 372,059
As a percentage of total loans	98.48%	96.66%
FUSB [Member] | Pass | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 52,815	$ 67,046
FUSB [Member] | Pass | Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	50,796	43,472
FUSB [Member] | Pass | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	173,661	189,425
FUSB [Member] | Pass | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	66,872	72,116
FUSB [Member] | Special Mention
Financing Receivable Recorded Investment [Line Items]
Loans	$ 3,069	$ 10,303
As a percentage of total loans	0.88%	2.68%
FUSB [Member] | Special Mention | Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans		$ 2,528
FUSB [Member] | Special Mention | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 3,069	7,442
FUSB [Member] | Special Mention | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans		333
FUSB [Member] | Substandard
Financing Receivable Recorded Investment [Line Items]
Loans	$ 2,250	$ 2,534
As a percentage of total loans	0.64%	0.66%
FUSB [Member] | Substandard | Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 2	$ 2
FUSB [Member] | Substandard | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	1,022	1,034
FUSB [Member] | Substandard | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	1,226	1,498
FUSB [Member] | Pass And Criticized [Member}
Financing Receivable Recorded Investment [Line Items]
Loans	$ 349,463	$ 384,896
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	$ 52,817	$ 67,048
FUSB [Member] | Pass And Criticized [Member} | Real Estate [Member] | Secured By Multi family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	50,796	46,000
FUSB [Member] | Pass And Criticized [Member} | Real Estate [Member] | Secured By Non-farm Non residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	177,752	197,901
FUSB [Member] | Pass And Criticized [Member} | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	68,098	73,947
ALC [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	35,778	43,697
ALC [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans		$ 323,891	$ 328,368
As a percentage of total loans		99.34%	99.32%
ALC [Member] | Nonperforming Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans		$ 2,157	$ 2,237
As a percentage of total loans		0.66%	0.68%
ALC [Member] | Performing And Non Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans		$ 326,048	$ 330,605
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	2,055	$ 2,288
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans		71,526	$ 68,585
ALC [Member] | Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Nonperforming Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans		1,201	1,175
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		72,727	69,760
ALC [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	11,832	15,717
ALC [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans		20,939	17,280
ALC [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member] | Nonperforming Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans		750	743
ALC [Member] | Consumer Portfolio Segment [Member] | Direct Consumer [Member] | Performing And Non Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans		21,689	18,023
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans		205,940	220,931
ALC [Member] | Consumer Portfolio Segment [Member] | Indirect [Member] | Performing And Non Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans		205,940	220,931
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 21,891	25,692
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Performing Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans		25,486	21,572
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Nonperforming Financial Instruments
Financing Receivable Recorded Investment [Line Items]
Loans		206	319
ALC [Member] | Consumer Portfolio Segment [Member] | Branch Retail [Member] | Performing And Non Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans		$ 25,692	$ 21,891

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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