Fair Value Presentation - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Cash and due from banks	$ 102,480	$ 53,376
Restricted equity securities	4,616	6,157
Securities:
Available for sale	118,844	92,791
Held to maturity	23,114	23,914
Bank owned life insurance	25,157	24,562
Level 1 [Member]
Assets:
Cash and due from banks	102,480	53,376
Level 2 [Member]
Assets:
Restricted equity securities	4,616	6,157
Securities:
Available for sale	118,844	92,791
Held to maturity	24,135	24,678
Derivative asset – interest rate swap on loans	13,967	4,039
Bank owned life insurance	25,157	24,562
Accrued interest receivable	8,110	4,282
Liabilities:
Deposits	906,616	510,766
Advances from the FHLB		39,998
Derivative liability – interest rate swaps on loans	13,967	4,039
Accrued interest payable	871	982
Level 3 [Member]
Securities:
Loans, net	1,314,407	1,048,181
Liabilities:
Deposits	524,173	568,245
Reported Value Measurement [Member]
Assets:
Cash and due from banks	102,480	53,376
Restricted equity securities	4,616	6,157
Securities:
Available for sale	118,844	92,791
Held to maturity	23,114	23,914
Loans, net	1,279,899	1,030,425
Derivative asset – interest rate swap on loans	13,967	4,039
Bank owned life insurance	25,157	24,562
Accrued interest receivable	8,110	4,282
Liabilities:
Deposits	1,417,045	1,071,623
Advances from the FHLB		40,000
Derivative liability – interest rate swaps on loans	13,967	4,039
Accrued interest payable	871	982
Estimate of Fair Value Measurement [Member]
Assets:
Cash and due from banks	102,480	53,376
Restricted equity securities	4,616	6,157
Securities:
Available for sale	118,844	92,791
Held to maturity	24,135	24,678
Loans, net	1,314,407	1,048,181
Derivative asset – interest rate swap on loans	13,967	4,039
Bank owned life insurance	25,157	24,562
Accrued interest receivable	8,110	4,282
Liabilities:
Deposits	1,430,789	1,079,011
Advances from the FHLB		39,998
Derivative liability – interest rate swaps on loans	13,967	4,039
Accrued interest payable	$ 871	$ 982