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Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 257,395 | $ 256,567 | $ 242,679
Unrealized Gains | 965 | 4,499 | 4,371
Unrealized Losses | (8,470) | (1,411) | (2,029)
Fair Value (Estimated) | 249,890 | 259,655 | 245,021
U.S. Government-sponsored agencies |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 11,155 | 11,155 | 11,154
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | (767) | (180) | (197)
Fair Value (Estimated) | 10,388 | 10,975 | 10,957
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 19,244 | 23,284 | 24,993
Unrealized Gains | 326 | 568 | 731
Unrealized Losses | (460) | (128) | (40)
Fair Value (Estimated) | 19,110 | 23,724 | 25,684
State and political subdivisions |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 222,696 | 217,828 | 202,232
Unrealized Gains | 639 | 3,931 | 3,640
Unrealized Losses | (7,243) | (1,103) | (1,792)
Fair Value (Estimated) | 216,092 | 220,656 | 204,080
Corporate securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 4,300 | 4,300 | 4,300
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | $ 4,300 | $ 4,300 | $ 4,300

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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