Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other investments:
Mutual fund - CRA qualified	$ 3,773	$ 3,628
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
U.S. Government sponsored agency securities	1,005	5,001
Mortgage-backed securities - residential	19,704	15,641
Collateralized mortgage obligations	71,082	35,907
Other investments:
Mutual fund - CRA qualified	3,773	3,628
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Other investments:
Mutual fund - CRA qualified	3,773	3,628
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
U.S. Government sponsored agency securities	1,005	5,001
Mortgage-backed securities - residential	19,704	15,641
Collateralized mortgage obligations	$ 71,082	$ 35,907