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Fair value measurements - Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Available-for-sale securities [Abstract]
Cost	$ 11,819	$ 11,878	$ 11,897
Gross Unrealized Gains	77	84	57
Gross Unrealized Losses	262	384	482
Fair Value	11,634	11,578	11,472
Mortgage-backed securities
Available-for-sale securities [Abstract]
Cost	8,403	7,933	8,091
Gross Unrealized Gains	24	4	3
Gross Unrealized Losses	260	383	482
Fair Value	8,167	7,554	7,612
U.S. Treasury securities
Available-for-sale securities [Abstract]
Cost	3,416	3,945	3,806
Gross Unrealized Gains	53	80	54
Gross Unrealized Losses	2	1	0
Fair Value	$ 3,467	$ 4,024	$ 3,860

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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).

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