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Investment Securities - Securities in Continuous Unrealized Loss Position (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | $ 82,923,000 | $ 15,041,000
Available-for-sale, less than 12 months, unrealized losses | (731,000) | (3,000)
Available-for-sale, 12 months or more, fair value | 3,417,000 | 4,346,000
Available-for-sale, 12 months or more, unrealized losses | (39,000) | (148,000)
Held-to-maturity, less than 12 months, fair value |  | 412,000
Held-to-maturity, less than 12 months, unrealized losses | 0 |
Residential Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 31,346,000 | 2,334,000
Available-for-sale, less than 12 months, unrealized losses | (240,000) | (1,000)
Available-for-sale, 12 months or more, fair value | 253,000 | 1,019,000
Available-for-sale, 12 months or more, unrealized losses | (2,000) | (7,000)
Commercial Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 2,245,000 | 2,630,000
Available-for-sale, less than 12 months, unrealized losses | (12,000) | (1,000)
Available-for-sale, 12 months or more, fair value | 2,970,000 | 3,327,000
Available-for-sale, 12 months or more, unrealized losses | (35,000) | (141,000)
Held-to-maturity, less than 12 months, fair value |  | 412,000
US Government Agencies Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 4,987,000 |
Available-for-sale, less than 12 months, unrealized losses | (13,000) |
Available-for-sale, 12 months or more, fair value | 194,000 |
Available-for-sale, 12 months or more, unrealized losses | (2,000) |
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 561,000 |
Available-for-sale, less than 12 months, unrealized losses | (10,000) |
Corporate Note Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 9,092,000 |
Available-for-sale, less than 12 months, unrealized losses | (52,000) |
US Treasury Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 34,692,000 | 10,077,000
Available-for-sale, less than 12 months, unrealized losses | $ (404,000) | $ (1,000)

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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=124269663&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=123581744&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=123581744&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=124269663&loc=SL82922890-210455 + Details
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