Derivative Financial Instruments - Schedule of Notional Amount and Fair Value of Derivative Instruments Included on Company's Consolidated Balance Sheets on a net Basis (Details) - Derivatives Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Estimated Fair Value Gain (Loss)	$ (1,513)	$ (2,610)
Fair Value Hedging [Member]
Derivatives Fair Value [Line Items]
Estimated Fair Value Gain (Loss)	(485)	(837)
Fair Value Hedging [Member] | Interest Rate Swaps Related to Fixed Rate Commercial Real Estate Loans [Member]
Derivatives Fair Value [Line Items]
Notional Amount	20,000	20,000	[1]
Estimated Fair Value Gain (Loss)	(485)	(837)
Cash Flow Hedging [Member]
Derivatives Fair Value [Line Items]
Estimated Fair Value Gain (Loss)	(1,028)	(1,773)
Cash Flow Hedging [Member] | Interest Rate Swaps Related to Variable-Rate Money Market Deposit Accounts [Member]
Derivatives Fair Value [Line Items]
Notional Amount	20,000	20,000	[1]
Estimated Fair Value Gain (Loss)	(775)	(1,337)
Cash Flow Hedging [Member] | Interest Rate Swaps Related to FHLB Advances [Member]
Derivatives Fair Value [Line Items]
Notional Amount	10,000	10,000	[1]
Estimated Fair Value Gain (Loss)	$ (253)	$ (436)

[1] Derivatives in a gain position are recorded as other assets and derivatives in a loss position are recorded as other liabilities in the consolidated balance sheets