Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Securities available-for-sale:
Securities available-for-sale, at fair value	$ 131,345	$ 123,198
Residential mortgage-backed securities
Securities available-for-sale:
Securities available-for-sale, at fair value	82,232	84,713
Residential collateralized mortgage obligations
Securities available-for-sale:
Securities available-for-sale, at fair value	27,097	19,056
SBA loan pool securities
Securities available-for-sale:
Securities available-for-sale, at fair value	11,627	8,672
Municipal bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	5,471	5,686
Corporate bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	4,918	5,071
Recurring
Securities available-for-sale:
Securities available-for-sale, at fair value	131,345	123,198
Total assets measured at fair value on a recurring basis	131,345	123,198
Total liabilities measured at fair value on a recurring basis	0	0
Recurring | Residential mortgage-backed securities
Securities available-for-sale:
Securities available-for-sale, at fair value	82,232	84,713
Recurring | Residential collateralized mortgage obligations
Securities available-for-sale:
Securities available-for-sale, at fair value	27,097	19,056
Recurring | SBA loan pool securities
Securities available-for-sale:
Securities available-for-sale, at fair value	11,627	8,672
Recurring | Municipal bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	5,471	5,686
Recurring | Corporate bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	4,918	5,071
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Total assets measured at fair value on a recurring basis	0	0
Total liabilities measured at fair value on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | Residential mortgage-backed securities
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | Residential collateralized mortgage obligations
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | SBA loan pool securities
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | Municipal bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | Corporate bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Significant Other Observable Inputs (Level 2) | Recurring
Securities available-for-sale:
Securities available-for-sale, at fair value	131,345	123,198
Total assets measured at fair value on a recurring basis	131,345	123,198
Total liabilities measured at fair value on a recurring basis	0	0
Significant Other Observable Inputs (Level 2) | Recurring | Residential mortgage-backed securities
Securities available-for-sale:
Securities available-for-sale, at fair value	82,232	84,713
Significant Other Observable Inputs (Level 2) | Recurring | Residential collateralized mortgage obligations
Securities available-for-sale:
Securities available-for-sale, at fair value	27,097	19,056
Significant Other Observable Inputs (Level 2) | Recurring | SBA loan pool securities
Securities available-for-sale:
Securities available-for-sale, at fair value	11,627	8,672
Significant Other Observable Inputs (Level 2) | Recurring | Municipal bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	5,471	5,686
Significant Other Observable Inputs (Level 2) | Recurring | Corporate bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	4,918	5,071
Significant Unobservable Inputs (Level 3) | Recurring
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Total assets measured at fair value on a recurring basis	0	0
Total liabilities measured at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Recurring | Residential mortgage-backed securities
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Significant Unobservable Inputs (Level 3) | Recurring | Residential collateralized mortgage obligations
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Significant Unobservable Inputs (Level 3) | Recurring | SBA loan pool securities
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Significant Unobservable Inputs (Level 3) | Recurring | Municipal bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	0	0
Significant Unobservable Inputs (Level 3) | Recurring | Corporate bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	$ 0	$ 0