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Investment Securities - Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | $ 20,686 | $ 10,836
Available-for-sale, less than 12 months, unrealized losses | (145) | (92)
Available-for-sale, 12 months or more, fair value | 43,855 | 107,357
Available-for-sale, 12 months or more, unrealized losses | (660) | (3,251)
Held-to-maturity, less than 12 months, fair value | 2,925 | 770
Held-to-maturity, less than 12 months, unrealized losses | (17) |
Held-to-maturity, 12 months or more, fair value | 13,384 | 20,082
Held-to-maturity, 12 months or more, unrealized losses | (95) | (610)
Residential Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 16,466 | 9,417
Available-for-sale, less than 12 months, unrealized losses | (135) | (87)
Available-for-sale, 12 months or more, fair value | 11,030 | 53,507
Available-for-sale, 12 months or more, unrealized losses | (185) | (1,430)
Commercial Mortgage Backed Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 4,140 | 461
Available-for-sale, less than 12 months, unrealized losses | (10) | (3)
Available-for-sale, 12 months or more, fair value | 32,825 | 53,430
Available-for-sale, 12 months or more, unrealized losses | (475) | (1,819)
Held-to-maturity, less than 12 months, fair value | 1,522 |
Held-to-maturity, less than 12 months, unrealized losses | (9) |
Held-to-maturity, 12 months or more, fair value | 7,902 | 11,367
Held-to-maturity, 12 months or more, unrealized losses | (74) | (349)
US Treasury Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value | 80 | 79
US Government Agencies Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Held-to-maturity, less than 12 months, fair value | 1,403 |
Held-to-maturity, less than 12 months, unrealized losses | (8) |
Held-to-maturity, 12 months or more, fair value | 4,979 | 7,782
Held-to-maturity, 12 months or more, unrealized losses | (21) | (244)
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule Of Investments [Line Items] |  |
Available-for-sale, less than 12 months, fair value |  | 879
Available-for-sale, less than 12 months, unrealized losses |  | (2)
Available-for-sale, 12 months or more, fair value |  | 420
Available-for-sale, 12 months or more, unrealized losses |  | (2)
Held-to-maturity, less than 12 months, fair value |  | 770
Held-to-maturity, 12 months or more, fair value | $ 503 | 933
Held-to-maturity, 12 months or more, unrealized losses |  | $ (17)

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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=118955579&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=118939692&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=118942371&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=118939692&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=118955579&loc=SL82922890-210455 + Details
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