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Investments - Unrealized losses (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | $ 234,330 | $ 283,243
Less than 12 Months, Unrealized Losses | (5,954) | (8,501)
12 Months or More, Fair Value | 28,613 | 18,104
12 Months or More, Unrealized Losses | (276) | (261)
Total Fair Value | 262,943 | 301,347
Total Unrealized Losses | (6,230) | (8,762)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 16,341 | 34,586
Less than 12 Months, Unrealized Losses | (61) | (198)
12 Months or More, Fair Value | 21,667 | 10,438
12 Months or More, Unrealized Losses | (131) | (79)
Total Fair Value | 38,008 | 45,024
Total Unrealized Losses | (192) | (277)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 95,913 | 122,522
Less than 12 Months, Unrealized Losses | (2,846) | (4,353)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Total Fair Value | 95,913 | 122,522
Total Unrealized Losses | (2,846) | (4,353)
U.S. Government agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 114,660 | 118,719
Less than 12 Months, Unrealized Losses | (2,963) | (3,866)
12 Months or More, Fair Value | 6,946 | 7,666
12 Months or More, Unrealized Losses | (145) | (182)
Total Fair Value | 121,606 | 126,385
Total Unrealized Losses | (3,108) | (4,048)
Other equity securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 7,416 | 7,416
Less than 12 Months, Unrealized Losses | (84) | (84)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Total Fair Value | 7,416 | 7,416
Total Unrealized Losses | $ (84) | $ (84)

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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=27724398&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=27724398&loc=d3e27337-111563 + Details
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