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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | $ 276,518 | $ 168,818
Less than 12 months, Unrealized Losses | (7,383) | (2,525)
12 months or more, Fair Value | 3,033 | 21,048
12 months or more, Unrealized Losses | (191) | (950)
Fair Value | 279,551 | 189,866
Unrealized Losses | (7,574) | (3,475)
U.S. Government-sponsored agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 6,642 | 45,311
Less than 12 months, Unrealized Losses | (233) | (1,469)
12 months or more, Fair Value | 0 | 17,185
12 months or more, Unrealized Losses | 0 | (815)
Fair Value | 6,642 | 62,496
Unrealized Losses | (233) | (2,284)
Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 197,528 | 120,915
Less than 12 months, Unrealized Losses | (3,090) | (1,027)
12 months or more, Fair Value | 2,905 | 910
12 months or more, Unrealized Losses | (184) | (71)
Fair Value | 200,433 | 121,825
Unrealized Losses | (3,274) | (1,098)
State and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 72,348 | 2,528
Less than 12 months, Unrealized Losses | (4,060) | (24)
12 months or more, Fair Value | 0 | 2,901
12 months or more, Unrealized Losses | 0 | (63)
Fair Value | 72,348 | 5,429
Unrealized Losses | (4,060) | (87)
Other equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 0 | 64
Less than 12 months, Unrealized Losses | 0 | (5)
12 months or more, Fair Value | 128 | 52
12 months or more, Unrealized Losses | (7) | (1)
Fair Value | 128 | 116
Unrealized Losses | $ (7) | $ (6)

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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=73527792&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=73527792&loc=d3e27337-111563 + Details
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