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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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