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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 280,229 | $ 148,611 | $ 234,959
Unrealized Losses (Less than 12 months) | (7,761) | (2,100) | (4,910)
Fair Value (Estimated) (12 months or more) | 132,575 | 144,394 | 7,652
Unrealized Losses (12 months or more) | (6,993) | (3,843) | (200)
Fair Value (Estimated) | 412,804 | 293,005 | 242,611
Unrealized Losses | (14,754) | (5,943) | (5,110)
U.S. Government-sponsored agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 6,882 | 7,161 | 7,972
Unrealized Losses (Less than 12 months) | (373) | (94) | (181)
Fair Value (Estimated) (12 months or more) | 3,689 | 3,814 | 0
Unrealized Losses (12 months or more) | (211) | (86) | 0
Fair Value (Estimated) | 10,571 | 10,975 | 7,972
Unrealized Losses | (584) | (180) | (181)
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 202,673 | 132,025 | 170,966
Unrealized Losses (Less than 12 months) | (5,660) | (1,857) | (2,613)
Fair Value (Estimated) (12 months or more) | 91,977 | 101,707 | 7,643
Unrealized Losses (12 months or more) | (3,757) | (2,693) | (197)
Fair Value (Estimated) | 294,650 | 233,732 | 178,609
Unrealized Losses | (9,417) | (4,550) | (2,810)
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 70,674 | 9,425 | 55,952
Unrealized Losses (Less than 12 months) | (1,728) | (149) | (2,115)
Fair Value (Estimated) (12 months or more) | 36,909 | 38,864 | 0
Unrealized Losses (12 months or more) | (3,025) | (1,061) | 0
Fair Value (Estimated) | 107,583 | 48,289 | 55,952
Unrealized Losses | $ (4,753) | (1,210) | (2,115)
Other equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) |  | 0 | 69
Unrealized Losses (Less than 12 months) |  | 0 | (1)
Fair Value (Estimated) (12 months or more) |  | 9 | 9
Unrealized Losses (12 months or more) |  | (3) | (3)
Fair Value (Estimated) |  | 9 | 78
Unrealized Losses |  | $ (3) | $ (4)

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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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- Definition Amount of accumulated unrealized loss on 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 12 months or longer. + 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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