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Investment Securities - Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | $ 10,792 | $ 15,041
Available-for-sale, less than 12 months, unrealized losses | (22) | (3)
Available-for-sale, 12 months or more, fair value | 3,969 | 4,346
Available-for-sale, 12 months or more, unrealized losses | (65) | (148)
Held-to-maturity, less than 12 months, fair value | 48 | 412
Residential Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 183 | 2,334
Available-for-sale, less than 12 months, unrealized losses |  | (1)
Available-for-sale, 12 months or more, fair value | 781 | 1,019
Available-for-sale, 12 months or more, unrealized losses | (4) | (7)
Commercial Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 453 | 2,630
Available-for-sale, less than 12 months, unrealized losses |  | (1)
Available-for-sale, 12 months or more, fair value | 3,188 | 3,327
Available-for-sale, 12 months or more, unrealized losses | (61) | (141)
Held-to-maturity, less than 12 months, fair value | 48 | 412
US Treasury Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 10,156 | 10,077
Available-for-sale, less than 12 months, unrealized losses | $ (22) | $ (1)

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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), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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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), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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