Commitments and contingencies (Details) - USD ($) $ in Thousands |
Mar. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Total commitments to extend credit | $ 148,395 | $ 150,974 |
| Standby letters of Credit | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Total commitments to extend credit | 4,771 | 4,934 |
| Undisbursed credit lines | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Total commitments to extend credit | 111,349 | 107,130 |
| Commitments to extend or originate credit | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Total commitments to extend credit | $ 32,275 | $ 38,910 |