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Securities (Schedule of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | $ 94,322 | $ 205,584
Less than 12 Months Unrealized Loss | (887) | (2,285)
12 Months or More Fair Value | 405,289 | 274,681
12 Months or More Unrealized Loss | (13,192) | (7,865)
Total Fair Value | 499,611 | 480,265
Total Unrealized Loss | (14,079) | (10,150)
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | 37,936 | 33,230
Less than 12 Months Unrealized Loss | (286) | (237)
12 Months or More Fair Value | 49,071 | 24,161
12 Months or More Unrealized Loss | (1,037) | (624)
Total Fair Value | 87,007 | 57,391
Total Unrealized Loss | (1,323) | (861)
MBS/CMO – Residential |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | 56,386 | 172,354
Less than 12 Months Unrealized Loss | (601) | (2,048)
12 Months or More Fair Value | 356,218 | 250,520
12 Months or More Unrealized Loss | (12,155) | (7,241)
Total Fair Value | 412,604 | 422,874
Total Unrealized Loss | $ (12,756) | $ (9,289)

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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. + 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=82897076&loc=d3e27337-111563 + Details
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