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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | $ 148,611 | $ 276,518
Less than 12 months, Unrealized Losses | (2,100) | (7,383)
12 months or more, Fair Value | 144,394 | 3,033
12 months or more, Unrealized Losses | (3,843) | (191)
Fair Value | 293,005 | 279,551
Unrealized Losses | (5,943) | (7,574)
U.S. Government-sponsored agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 7,161 | 6,642
Less than 12 months, Unrealized Losses | (94) | (233)
12 months or more, Fair Value | 3,814 | 0
12 months or more, Unrealized Losses | (86) | 0
Fair Value | 10,975 | 6,642
Unrealized Losses | (180) | (233)
Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 132,025 | 197,528
Less than 12 months, Unrealized Losses | (1,857) | (3,090)
12 months or more, Fair Value | 101,707 | 2,905
12 months or more, Unrealized Losses | (2,693) | (184)
Fair Value | 233,732 | 200,433
Unrealized Losses | (4,550) | (3,274)
State and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 9,425 | 72,348
Less than 12 months, Unrealized Losses | (149) | (4,060)
12 months or more, Fair Value | 38,864 | 0
12 months or more, Unrealized Losses | (1,061) | 0
Fair Value | 48,289 | 72,348
Unrealized Losses | (1,210) | (4,060)
Other equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 0 | 0
Less than 12 months, Unrealized Losses | 0 | 0
12 months or more, Fair Value | 9 | 128
12 months or more, Unrealized Losses | (3) | (7)
Fair Value | 9 | 128
Unrealized Losses | $ (3) | $ (7)

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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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