Fair Value Measurement and Disclosures - Summary of Estimated Fair Values Related to Carrying Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial assets:
Securities available-for-sale	$ 493,274	$ 303,303
Bank owned life insurance	29,016	28,219
Accrued interest receivable	6,799	3,841
Financial liabilities:
Securities sold under agreements to repurchase	13,653	8,707
Carrying Amount
Financial assets:
Cash and cash equivalents	60,268	45,455
Certificates of deposit in banks	4,155	4,836
Securities available-for-sale	493,274	303,303
Restricted equity securities	1,778	1,650
Loans receivable	1,169,779	897,105
Loans held for sale	24,004	6,285
Bank owned life insurance	29,016	28,219
Accrued interest receivable	6,799	3,841
Financial liabilities:
Deposits	1,653,635	1,174,299
Accrued interest payable	455	614
Securities sold under agreements to repurchase	13,653	8,707
Note payable	20,392	23,773
Estimate Fair Value | Quoted Prices In Active Markets For Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	60,268	45,455
Estimate Fair Value | Significant Other Observable Inputs (Level 2)
Financial assets:
Certificates of deposit in banks	4,155	4,836
Securities available-for-sale	493,274	303,303
Loans receivable	1,184,010	903,303
Loans held for sale	24,004	6,285
Bank owned life insurance	29,016	28,219
Accrued interest receivable	6,799	3,841
Financial liabilities:
Deposits	1,640,680	1,146,130
Accrued interest payable	455	614
Securities sold under agreements to repurchase	13,653	8,707
Note payable	20,392	23,773
Estimate Fair Value | Significant Unobservable Inputs (Level 3)
Financial assets:
Restricted equity securities	1,778	1,650
Loans receivable	$ 4,756	$ 3,440