Loans and allowance for loan losses - Nonaccrual loans (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 387,000	$ 291,000
Financing receivable with individual allowance	125,000
Individual allowance of financing receivable	17,000	0
Consumer real estate secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total loans	253,000	265,000
Consumer real estate secured by 1-4 family residential \| First deed of trust
Financing Receivable, Recorded Investment [Line Items]
Total loans	157,000	160,000
Consumer real estate secured by 1-4 family residential \| Second deed of trust
Financing Receivable, Recorded Investment [Line Items]
Total loans	96,000	105,000
Commercial and industrial loans \| Commercial and industrial loans (except those secured by real estate)
Financing Receivable, Recorded Investment [Line Items]
Total loans	134,000	$ 26,000
Individual allowance of financing receivable	$ 17,000

Amount of allowance for credit loss on financing receivable evaluated on individual basis. Excludes financing receivable evaluated on collective basis.

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