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Available-for-sale securities (Details 2) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Available-for-sale securities [Abstract] |  |  |
Cost | $ 11,693 | $ 11,536 | $ 10,954
Gross Unrealized Gains | 11 | 2 | 0
Gross Unrealized Losses | 773 | 708 | 865
Fair Value | 10,931 | 10,830 | 10,089
Mortgage-backed securities |  |  |
Available-for-sale securities [Abstract] |  |  |
Cost | 8,386 | 8,928 | 8,486
Gross Unrealized Gains | 0 | 2 | 0
Gross Unrealized Losses | 750 | 636 | 783
Fair Value | 7,636 | 8,294 | 7,703
U.S. Treasury securities |  |  |
Available-for-sale securities [Abstract] |  |  |
Cost | 3,307 | 2,608 | 2,468
Gross Unrealized Gains | 11 | 0 | 0
Gross Unrealized Losses | 23 | 72 | 82
Fair Value | $ 3,295 | $ 2,536 | $ 2,386

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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