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Fair value measurements - Schedule of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Available-for-sale securities [Abstract]
Cost	$ 11,866	$ 11,878	$ 11,828
Gross Unrealized Gains	94	84	39
Gross Unrealized Losses	300	384	509
Fair Value	11,660	11,578	11,358
Mortgage-backed securities
Available-for-sale securities [Abstract]
Cost	7,997	7,933	8,072
Gross Unrealized Gains	18	4	4
Gross Unrealized Losses	299	383	507
Fair Value	7,716	7,554	7,569
U.S. Treasury securities
Available-for-sale securities [Abstract]
Cost	3,869	3,945	3,756
Gross Unrealized Gains	76	80	35
Gross Unrealized Losses	1	1	2
Fair Value	$ 3,944	$ 4,024	$ 3,789

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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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