Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	$ 161,182	$ 150,444
Other investment securities:
Mutual fund - CRA qualified	3,500	3,700
Residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	40,696	37,412
Residential collateralized mortgage obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	120,486	113,032
Fair Value, Measurements, Recurring
Other investment securities:
Mutual fund - CRA qualified	3,545	3,708
Fair Value, Measurements, Recurring | Residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	40,696	37,412
Fair Value, Measurements, Recurring | Residential collateralized mortgage obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	120,486	113,032
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Other investment securities:
Mutual fund - CRA qualified	3,545	3,708
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Residential collateralized mortgage obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Other investment securities:
Mutual fund - CRA qualified	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	40,696	37,412
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential collateralized mortgage obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	120,486	113,032
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Other investment securities:
Mutual fund - CRA qualified	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential collateralized mortgage obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale debt securities, at fair value	$ 0	$ 0