Commitments and Contingencies - Narrative (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) action	Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items]
Amount of loans sold to FHLB	$ 15,300,000
Federal Home Loan Bank, First Loss Account Established	938,000
Bank recourse obligation	$ 811,000
Bank recourse obligation, percentage of loans outstanding	5.30%
Reserve as a percentage of outstanding CE	10.00%
Reserve for loans sold	$ 81,000
Outstanding delinquencies on loans sold to Federal Home Loan Bank	$ 0	$ 498,000
Change of control agreement, executive payment, period following change in control (in months)	12 months
Pending material legal actions | action	0
CEO
Loss Contingencies [Line Items]
Severance agreement, period of base compensation disbursed as lump sum payment (in months)	24 months
Maximum
Loss Contingencies [Line Items]
Change of control agreement, executive payment, period prior to change in control (in months)	6 months
Change of control agreement, period of base compensation disbursed as lump sum payment (in months)	12 months
Minimum
Loss Contingencies [Line Items]
Change of control agreement, notice required to cancel agreement (in months)	24 months
Commitments to Extend Credit
Loss Contingencies [Line Items]
Reserve for estimated losses	$ 496,000	407,000
Guarantee on loans sold
Loss Contingencies [Line Items]
Reserve for estimated losses	$ 2,500,000	$ 2,000,000.0