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Fair value measurements - Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Available-for-sale securities [Abstract] |  |  |
Cost | $ 11,960 | $ 11,878 | $ 12,001
Gross Unrealized Gains | 48 | 84 | 115
Gross Unrealized Losses | 233 | 384 | 312
Fair Value | 11,775 | 11,578 | 11,804
Mortgage-backed securities |  |  |
Available-for-sale securities [Abstract] |  |  |
Cost | 8,465 | 7,933 | 8,104
Gross Unrealized Gains | 24 | 4 | 41
Gross Unrealized Losses | 230 | 383 | 312
Fair Value | 8,259 | 7,554 | 7,833
U.S. Treasury securities |  |  |
Available-for-sale securities [Abstract] |  |  |
Cost | 3,495 | 3,945 | 3,897
Gross Unrealized Gains | 24 | 80 | 74
Gross Unrealized Losses | 3 | 1 | 0
Fair Value | $ 3,516 | $ 4,024 | $ 3,971

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