Fair Values of Financial Instruments - Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Other Than Goodwill (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Discounted cash flow | State and municipal securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 5,456	$ 2,444
Discounted cash flow | State and municipal securities | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Maturity Call Date	1 month	1 month
US Muni BQ curve	A-	A-
Discounted cash flow | State and municipal securities | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Maturity Call Date	15 years	15 years
US Muni BQ curve	BBB-	BBB-
Discounted cash flow | State and municipal securities | Discounted cash flow | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.0075	0.015
Discounted cash flow | State and municipal securities | Discounted cash flow | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.04	0.04
Discounted cash flow | State and municipal securities | Weighted-average coupon | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.037	0.039
Discounted cash flow | Corporate obligations and U.S. Government-sponsored mortgage backed securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 35	$ 35
Discounted cash flow | Corporate obligations and U.S. Government-sponsored mortgage backed securities | Risk free rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Risk free rate	3 month LIBOR	3 month LIBOR
Discounted cash flow | Corporate obligations and U.S. Government-sponsored mortgage backed securities | Premium for illiquidity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0.02	0.02
Discounted cash flow | Corporate obligations and U.S. Government-sponsored mortgage backed securities | Weighted-average coupon | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	0	0
Collateral based measurements | Collateral dependent loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 24,491	$ 37,250
Collateral based measurements | Collateral dependent loans | Collateral based measurements | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0	0
Collateral based measurements | Collateral dependent loans | Collateral based measurements | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0.10	0.10
Collateral based measurements | Collateral dependent loans | Collateral based measurements | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount to reflect current market conditions and ultimate collectability	0.055	0.060
Appraisals | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 96	$ 544
Appraisals | Other real estate owned | Appraisals | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0	0
Appraisals | Other real estate owned | Appraisals | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0.44	0.30
Appraisals | Other real estate owned | Appraisals | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	0.435	0.262