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Investments - Unrealized losses (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | $ 235,197 | $ 180,744
Less than 12 Months, Unrealized Losses | (6,891) | (2,148)
12 Months or More, Fair Value | 111,644 | 74,586
12 Months or More, Unrealized Losses | (6,074) | (2,195)
Total Fair Value | 346,841 | 255,330
Total Unrealized Losses | (12,965) | (4,343)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 16,539 | 8,201
Less than 12 Months, Unrealized Losses | (349) | (47)
12 Months or More, Fair Value | 5,704 | 6,741
12 Months or More, Unrealized Losses | (136) | (27)
Total Fair Value | 22,243 | 14,942
Total Unrealized Losses | (485) | (74)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 42,967 | 1,627
Less than 12 Months, Unrealized Losses | (1,139) | (3)
12 Months or More, Fair Value | 3,080 | 3,357
12 Months or More, Unrealized Losses | (152) | (87)
Total Fair Value | 46,047 | 4,984
Total Unrealized Losses | (1,291) | (90)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 130,925 | 82,604
Less than 12 Months, Unrealized Losses | (3,482) | (822)
12 Months or More, Fair Value | 52,418 | 64,488
12 Months or More, Unrealized Losses | (3,150) | (2,081)
Total Fair Value | 183,343 | 147,092
Total Unrealized Losses | (6,632) | (2,903)
Private label mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 44,766 | 88,312
Less than 12 Months, Unrealized Losses | (1,921) | (1,276)
12 Months or More, Fair Value | 50,442 | 0
12 Months or More, Unrealized Losses | (2,636) | 0
Total Fair Value | 95,208 | 88,312
Total Unrealized Losses | $ (4,557) | $ (1,276)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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