Regulatory Capital Requirements - Schedule Of Compliance With Regulatory Capital Requirements Under Banking Regulations (Detail) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital (to Average Assets), Actual, Amount	$ 143,148	$ 128,140
Tier 1 Capital (to Average Assets), Actual, Ratio	7.23	7.49
Tier 1 Capital (to Average Assets), Actual, Amount	$ 143,148	$ 128,140
Tier 1 Capital (to Average Assets), Actual, Ratio	8.62	10.11
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 143,148	$ 128,140
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	8.62	10.11
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 211,637	$ 167,550
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	12.75	13.22
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Amount	$ 79,204	$ 68,413
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Amount	74,695	57,052
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Amount	99,594	76,070
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	132,792	101,427
Tier I Capital (to Average Assets),Required to be Well Capitalized ,amount	99,005	85,517
Tier I Capital (to Average Assets),Required to be Well Capitalized ,amount	107,893	82,409
Tier I Capital (to Average Assets),Required to be Well Capitalized ,amount	132,792	101,427
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	$ 165,990	$ 126,783
Parent Company [Member] | Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Ratio	4.00	4.00
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Ratio	4.50%	4.50%
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Ratio	6.00	6.00
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	8.00	8.00
Tier I Capital (to Average Assets),Required to be Well Capitalized ,Ratio	5.00	5.00
Tier I Capital (to Average Assets),Required to be Well Capitalized ,Ratio	6.50%	6.50%
Tier I Capital (to Average Assets),Required to be Well Capitalized ,Ratio	8.00	8.00
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio	10.00	10.00
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital (to Average Assets), Actual, Amount	$ 188,635	$ 137,214
Tier 1 Capital (to Average Assets), Actual, Ratio	9.51	8.02
Tier 1 Capital (to Average Assets), Actual, Amount	$ 188,635	$ 137,214
Tier 1 Capital (to Average Assets), Actual, Ratio	11.38	10.80
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 188,635	$ 137,214
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	11.38	10.80
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 203,095	$ 156,624
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	12.25	12.33
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Amount	$ 79,373	$ 68,462
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Amount	74,616	57,166
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Amount	99,489	76,221
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	132,652	101,628
Tier I Capital (to Average Assets),Required to be Well Capitalized ,amount	99,216	85,578
Tier I Capital (to Average Assets),Required to be Well Capitalized ,amount	107,779	82,573
Tier I Capital (to Average Assets),Required to be Well Capitalized ,amount	132,652	101,628
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	$ 165,814	$ 127,035
Bank [Member] | Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Ratio	4.00	4.00
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Ratio	4.50%	4.50%
Tier I Capital (to Average Assets ), For Capital Adequacy Purposes, Ratio	6.00	6.00
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	8.00	8.00
Tier I Capital (to Average Assets),Required to be Well Capitalized ,Ratio	5.00	5.00
Tier I Capital (to Average Assets),Required to be Well Capitalized ,Ratio	6.50%	6.50%
Tier I Capital (to Average Assets),Required to be Well Capitalized ,Ratio	8.00	8.00
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio	10.00	10.00