Commitments and Contingencies - Credit Commitments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Commitments and Contingencies
Loan commitments with fixed interest rate	$ 3,900	$ 3,800
Loan commitments with variable interest rate	15,600	15,300
Commitments to grant loans
Commitments and Contingencies
Credit risk for financial instruments	3,985	3,524
Unfunded commitments under lines of credit
Commitments and Contingencies
Credit risk for financial instruments	$ 15,588	$ 15,568

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Name:	us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration