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Investment Securities - Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | $ 7,049 | $ 21,214
Available-for-sale, less than 12 months, unrealized losses | (13) | (91)
Available-for-sale, 12 months or more, fair value | 4,481 | 39,848
Available-for-sale, 12 months or more, unrealized losses | (213) | (504)
Held-to-maturity, less than 12 months, fair value | 771 | 1,531
Held-to-maturity, less than 12 months, unrealized losses | (4) | (4)
Held-to-maturity, 12 months or more, fair value |  | 9,399
Held-to-maturity, 12 months or more, unrealized losses |  | (52)
Residential Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 1,414 | 17,340
Available-for-sale, less than 12 months, unrealized losses | (6) | (66)
Available-for-sale, 12 months or more, fair value | 866 | 10,094
Available-for-sale, 12 months or more, unrealized losses | (7) | (143)
Commercial Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 4,415 | 3,794
Available-for-sale, less than 12 months, unrealized losses | (6) | (25)
Available-for-sale, 12 months or more, fair value | 3,469 | 29,754
Available-for-sale, 12 months or more, unrealized losses | (206) | (361)
Held-to-maturity, less than 12 months, fair value | 771 | 685
Held-to-maturity, less than 12 months, unrealized losses | (4) |
Held-to-maturity, 12 months or more, fair value |  | 6,405
Held-to-maturity, 12 months or more, unrealized losses |  | (46)
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 1,139 |
Available-for-sale, less than 12 months, unrealized losses | (1) |
Available-for-sale, 12 months or more, fair value | 146 |
US Treasury Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | $ 81 | 80
US Government Agencies Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Held-to-maturity, less than 12 months, fair value |  | 846
Held-to-maturity, less than 12 months, unrealized losses |  | (4)
Held-to-maturity, 12 months or more, fair value |  | 2,994
Held-to-maturity, 12 months or more, unrealized losses |  | $ (6)

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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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