Fair Value - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	$ 15,800,000
Available-for-sale securities measure at fair value on recurring basis	172,000	$ 166,000
Fair Value Measurement Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	129,354,000	53,070,000
Available-for-sale securities measure at fair value on recurring basis	15,836,000	35,406,000
Available-for-sale securities measure at fair value on recurring basis	172,000	166,000
Fair Value Measurement Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	129,182,000	52,904,000
Available-for-sale securities measure at fair value on recurring basis	15,836,000	35,406,000
Fair Value Measurement Recurring | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	172,000	166,000
Available-for-sale securities measure at fair value on recurring basis	172,000	166,000
U.S. Government Bonds | Fair Value Measurement Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	2,934,000
U.S. Government Bonds | Fair Value Measurement Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	2,934,000
Corporate Bonds | Fair Value Measurement Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	21,184,000	10,463,000
Corporate Bonds | Fair Value Measurement Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	21,184,000	10,463,000
FNMA Certificates | Fair Value Measurement Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	70,699,000	3,567,000
FNMA Certificates | Fair Value Measurement Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	70,699,000	3,567,000
GNMA Certificates | Fair Value Measurement Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	181,000	272,000
GNMA Certificates | Fair Value Measurement Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	181,000	272,000
Collateralized Mortgage Obligations | Fair Value Measurement Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	18,348,000
Collateralized Mortgage Obligations | Fair Value Measurement Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis	$ 18,348,000
FHLMC Certificates | Fair Value Measurement Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis		3,196,000
FHLMC Certificates | Fair Value Measurement Recurring | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities measure at fair value on recurring basis		$ 3,196,000