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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities Available-for-Sale by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	$ 44,224	$ 23,791
Investment securities available-for-sale, Estimated Fair Value	44,071	24,005
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Investment securities available-for-sale, within 1 year, Amortized Cost	0
Investment securities available-for-sale, Greater than 1 to 5 years, Amortized Cost	0
Investment securities available-for-sale, Greater than 5 to 10 years, Amortized Cost	4,074
Investment securities available-for-sale, Greater than 10 years, Amortized Cost	0
Investment securities available-for-sale, Amortized Cost	4,074
Investment securities available-for-sale, within 1 year, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 1 to 5 years, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 5 to 10 years, Estimated Fair Value	4,083
Investment securities available-for-sale, Greater than10 years, Estimated Fair Value	0
Investment securities available-for-sale, Estimated Fair Value	4,083
Municipal Securities - Tax Exempt
Schedule Of Available For Sale Securities [Line Items]
Investment securities available-for-sale, within 1 year, Amortized Cost	0
Investment securities available-for-sale, Greater than 1 to 5 years, Amortized Cost	0
Investment securities available-for-sale, Greater than 5 to 10 years, Amortized Cost	0
Investment securities available-for-sale, Greater than 10 years, Amortized Cost	541
Investment securities available-for-sale, Amortized Cost	541
Investment securities available-for-sale, within 1 year, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 1 to 5 years, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 5 to 10 years, Estimated Fair Value	0
Investment securities available-for-sale, Greater than10 years, Estimated Fair Value	533
Investment securities available-for-sale, Estimated Fair Value	533
Municipal Securities - Taxable
Schedule Of Available For Sale Securities [Line Items]
Investment securities available-for-sale, within 1 year, Amortized Cost	0
Investment securities available-for-sale, Greater than 1 to 5 years, Amortized Cost	0
Investment securities available-for-sale, Greater than 5 to 10 years, Amortized Cost	0
Investment securities available-for-sale, Greater than 10 years, Amortized Cost	797
Investment securities available-for-sale, Amortized Cost	797
Investment securities available-for-sale, within 1 year, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 1 to 5 years, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 5 to 10 years, Estimated Fair Value	0
Investment securities available-for-sale, Greater than10 years, Estimated Fair Value	789
Investment securities available-for-sale, Estimated Fair Value	789
Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Investment securities available-for-sale, within 1 year, Amortized Cost	0
Investment securities available-for-sale, Greater than 1 to 5 years, Amortized Cost	0
Investment securities available-for-sale, Greater than 5 to 10 years, Amortized Cost	0
Investment securities available-for-sale, Greater than 10 years, Amortized Cost	11,837
Investment securities available-for-sale, within 1 year, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 1 to 5 years, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 5 to 10 years, Estimated Fair Value	0
Investment securities available-for-sale, Greater than10 years, Estimated Fair Value	11,706
Corporate Securities
Schedule Of Available For Sale Securities [Line Items]
Investment securities available-for-sale, within 1 year, Amortized Cost	0
Investment securities available-for-sale, Greater than 1 to 5 years, Amortized Cost	0
Investment securities available-for-sale, Greater than 5 to 10 years, Amortized Cost	6,217
Investment securities available-for-sale, Greater than 10 years, Amortized Cost	500
Investment securities available-for-sale, Amortized Cost	6,717	2,715
Investment securities available-for-sale, within 1 year, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 1 to 5 years, Estimated Fair Value	0
Investment securities available-for-sale, Greater than 5 to 10 years, Estimated Fair Value	6,200
Investment securities available-for-sale, Greater than10 years, Estimated Fair Value	425
Investment securities available-for-sale, Estimated Fair Value	6,625	2,614
U.S. Treasury Securities, Municipal Securities - Tax Exempt, Municipal Securities - Taxable, Government Agency Securities, Corporate Securities
Schedule Of Available For Sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	23,966
Investment securities available-for-sale, Estimated Fair Value	23,736
Government Agency Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Investment securities available-for-sale, Amortized Cost	20,258	9,206
Investment securities available-for-sale, Estimated Fair Value	$ 20,335	$ 9,532

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