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Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | $ 96,994 | $ 81,620
U.S. government agency obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 10,445 | 7,147
Municipal obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 10,845 | 10,980
Mortgage-backed residential obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 45,478 | 43,094
Collateralized mortgage obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 30,226 | 20,399
Recurring |  |
Assets, Fair Value Disclosure [Abstract] |  |
Loans held for sale | 972 | 1,972
Total | 97,966 | 83,592
Recurring | U.S. government agency obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 10,445 | 7,147
Recurring | Municipal obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 10,845 | 10,980
Recurring | Mortgage-backed residential obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 45,478 | 43,094
Recurring | Collateralized mortgage obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 30,226 | 20,399
Recurring | Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Loans held for sale | 0 | 0
Total | 0 | 0
Recurring | Level 1 | U.S. government agency obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 0 | 0
Recurring | Level 1 | Municipal obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 0 | 0
Recurring | Level 1 | Mortgage-backed residential obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 0 | 0
Recurring | Level 1 | Collateralized mortgage obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 0 | 0
Recurring | Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Loans held for sale | 972 | 1,972
Total | 97,966 | 83,592
Recurring | Level 2 | U.S. government agency obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 10,445 | 7,147
Recurring | Level 2 | Municipal obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 10,845 | 10,980
Recurring | Level 2 | Mortgage-backed residential obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 45,478 | 43,094
Recurring | Level 2 | Collateralized mortgage obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 30,226 | 20,399
Recurring | Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Loans held for sale | 0 | 0
Total | 0 | 0
Recurring | Level 3 | U.S. government agency obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 0 | 0
Recurring | Level 3 | Municipal obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 0 | 0
Recurring | Level 3 | Mortgage-backed residential obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | 0 | 0
Recurring | Level 3 | Collateralized mortgage obligations |  |
Assets, Fair Value Disclosure [Abstract] |  |
Securities available for sale | $ 0 | $ 0

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- Definition Amount 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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