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Fair value measurements - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Available-for-sale securities [Abstract] |  |  |
Cost | $ 11,828 | $ 11,755 | $ 11,580
Gross Unrealized Gains | 39 | 45 | 11
Gross Unrealized Losses | 509 | 478 | 612
Fair Value | 11,358 | 11,322 | 10,979
Mortgage-backed securities |  |  |
Available-for-sale securities [Abstract] |  |  |
Cost | 8,072 | 8,234 | 8,557
Gross Unrealized Gains | 4 | 17 | 3
Gross Unrealized Losses | 507 | 470 | 561
Fair Value | 7,569 | 7,781 | 7,999
U.S. Treasury securities |  |  |
Available-for-sale securities [Abstract] |  |  |
Cost | 3,756 | 3,521 | 3,023
Gross Unrealized Gains | 35 | 28 | 8
Gross Unrealized Losses | 2 | 8 | 51
Fair Value | $ 3,789 | $ 3,541 | $ 2,980

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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