Loans and allowance for loan losses - Information about TDRs (Details) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2022 loan	Jun. 30, 2021 USD ($) loan	Dec. 31, 2021 loan
Information About Tdrs Identified During Period Line Items [Line Items]
Number of Loans \| loan	26	1	28
Pre-Modification Recorded Investment		$ 267
Post-Modification Recorded Investment		$ 267
First deed of trust \| Consumer Real Estate Secured By 1-4 Family Residential
Information About Tdrs Identified During Period Line Items [Line Items]
Number of Loans \| loan		1
Pre-Modification Recorded Investment		$ 267
Post-Modification Recorded Investment		$ 267

Number of financing receivables that have been modified by troubled debt restructurings.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

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Amount, before troubled debt restructuring, of financing receivable to be modified.

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