Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other investments:
Mutual fund - CRA qualified	$ 3,769	$ 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	2,013	5,001
Mortgage-backed securities - residential	21,768	15,641
Collateralized mortgage obligations	69,701	35,907
Other investments:
Mutual fund - CRA qualified	3,769	3,628
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Other investments:
Mutual fund - CRA qualified	3,769	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	2,013	5,001
Mortgage-backed securities - residential	21,768	15,641
Collateralized mortgage obligations	$ 69,701	$ 35,907