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Available-for-sale securities (Details 2) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Available-for-sale securities [Abstract]
Cost	$ 11,278	$ 11,185	$ 10,979
Gross Unrealized Gains	93	156	216
Gross Unrealized Losses	39	14	4
Fair Value	11,332	11,327	11,191
Mortgage-backed securities
Available-for-sale securities [Abstract]
Cost	8,597	9,799	9,813
Gross Unrealized Gains	93	156	213
Gross Unrealized Losses	11	9	4
Fair Value	8,679	9,946	10,022
U.S. Treasury securities
Available-for-sale securities [Abstract]
Cost	2,681	1,386	1,166
Gross Unrealized Gains	0	0	3
Gross Unrealized Losses	28	5	0
Fair Value	$ 2,653	$ 1,381	$ 1,169

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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).

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