Fair Value of Financial Instruments - Quantitative Information About Non-recurring Level 3 Fair Value of Financial Instruments (Details) - Fair Value, Measurements, Nonrecurring [Member] $ in Thousands	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Impaired loans	$ 11,614	$ 11,980
Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member]
Impaired loans	$ 11,163	$ 10,690
Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member] | Minimum [Member]
Impaired loans, measurement input	8.0	(100.0)
Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member] | Maximum [Member]
Impaired loans, measurement input	15.0	15.0
Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member] | Weighted Average [Member]
Impaired loans, measurement input	11.8	6.8
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member]
Impaired loans	$ 451	$ 1,290
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]
Impaired loans, measurement input	4.3	4.3
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]
Impaired loans, measurement input		5.5
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted Average [Member]
Impaired loans, measurement input	4.3	4.9
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Minimum [Member]
Impaired loans, measurement input	35.0	20.0
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Maximum [Member]
Impaired loans, measurement input		35.0
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Severity [Member] | Weighted Average [Member]
Impaired loans, measurement input	35.0	27.4