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Investment Securities - Gross unrealized losses (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Investment securities available-for-sale |  |
Unrealized losses less than 12 months | $ (88) | $ (91)
Fair value less than 12 months | 26,959 | 20,875
Unrealized losses over 12 months | (178) | (5,123)
Fair value over 12 months | 36,232 | 198,038
Total Unrealized losses | (266) | (5,214)
Total Fair value | 63,191 | 218,913
U.S. treasury and government agencies |  |
Investment securities available-for-sale |  |
Unrealized losses less than 12 months | (3) | (8)
Fair value less than 12 months | 1,757 | 5,288
Unrealized losses over 12 months | (31) | (214)
Fair value over 12 months | 9,969 | 11,598
Total Unrealized losses | (34) | (222)
Total Fair value | 11,726 | 16,886
Obligations of state and political agencies |  |
Investment securities available-for-sale |  |
Unrealized losses less than 12 months | (23) |
Fair value less than 12 months | 5,965 | 389
Unrealized losses over 12 months | (51) | (1,446)
Fair value over 12 months | 5,999 | 55,770
Total Unrealized losses | (74) | (1,446)
Total Fair value | 11,964 | 56,159
Mortgage backed securities - Residential Agency |  |
Investment securities available-for-sale |  |
Unrealized losses less than 12 months | (44) | (44)
Fair value less than 12 months | 10,020 | 7,352
Unrealized losses over 12 months | (81) | (3,074)
Fair value over 12 months | 17,138 | 112,293
Total Unrealized losses | (125) | (3,118)
Total Fair value | 27,158 | 119,645
Mortgage backed securities - Commercial |  |
Investment securities available-for-sale |  |
Unrealized losses less than 12 months | (18) | (39)
Fair value less than 12 months | 9,215 | 7,844
Unrealized losses over 12 months | (15) | (264)
Fair value over 12 months | 3,126 | 9,741
Total Unrealized losses | (33) | (303)
Total Fair value | 12,341 | 17,585
Asset backed securities |  |
Investment securities available-for-sale |  |
Fair value less than 12 months | 2 | 2
Unrealized losses over 12 months |  | (4)
Fair value over 12 months |  | 155
Total Unrealized losses |  | (4)
Total Fair value | $ 2 | 157
Corporate bonds |  |
Investment securities available-for-sale |  |
Unrealized losses over 12 months |  | (121)
Fair value over 12 months |  | 8,481
Total Unrealized losses |  | (121)
Total Fair value |  | $ 8,481

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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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