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Investment Securities - Unrealized losses (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | $ 188,167 | $ 283,243
12 Months or More, Fair Value | 74,586 | 18,104
Total Fair Value | 262,753 | 301,347
Less than 12 Months, Unrealized Losses | (2,225) | (8,501)
12 Months or More, Unrealized Losses | (2,195) | (261)
Total Unrealized Losses | (4,420) | (8,762)
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 8,201 | 34,586
12 Months or More, Fair Value | 6,741 | 10,438
Total Fair Value | 14,942 | 45,024
Less than 12 Months, Unrealized Losses | (47) | (198)
12 Months or More, Unrealized Losses | (27) | (79)
Total Unrealized Losses | (74) | (277)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 1,627 | 122,522
12 Months or More, Fair Value | 3,357 | 0
Total Fair Value | 4,984 | 122,522
Less than 12 Months, Unrealized Losses | (3) | (4,353)
12 Months or More, Unrealized Losses | (87) | 0
Total Unrealized Losses | (90) | (4,353)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 82,604 | 118,719
12 Months or More, Fair Value | 64,488 | 7,666
Total Fair Value | 147,092 | 126,385
Less than 12 Months, Unrealized Losses | (822) | (3,866)
12 Months or More, Unrealized Losses | (2,081) | (182)
Total Unrealized Losses | (2,903) | (4,048)
Private label residential mortgage and asset backed securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 88,312 |
12 Months or More, Fair Value | 0 |
Total Fair Value | 88,312 |
Less than 12 Months, Unrealized Losses | (1,276) |
12 Months or More, Unrealized Losses | 0 |
Total Unrealized Losses | (1,276) |
Other equity securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 Months, Fair Value | 7,423 | 7,416
12 Months or More, Fair Value | 0 | 0
Total Fair Value | 7,423 | 7,416
Less than 12 Months, Unrealized Losses | (77) | (84)
12 Months or More, Unrealized Losses | 0 | 0
Total Unrealized Losses | $ (77) | $ (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=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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