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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
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Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Amortized Cost | $ 0 | $ 111 | $ 176
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 13,961 | 841 | 856
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 69,317 | 29,003 | 33,550
Due after 10 years, Securities available for sale, Amortized Cost | 230,470 | 270,594 | 262,429
Equity securities, Amortized Cost | 3,257 | 3,296 | 3,257
Amortized Cost | 317,005 |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Fair Value (Estimated) | 0 | 112 | 179
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 13,886 | 842 | 859
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 67,434 | 29,177 | 33,987
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 220,867 | 266,627 | 260,606
Other equity securities | 3,257 | 3,414 | 3,368
Securities available for sale, Fair Value (Estimated) | 305,444 |  |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Amortized Cost | 1,796 | 635 | 552
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 21,463 | 18,059 | 17,241
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 155,997 | 37,182 | 37,218
Due after 10 years, Securities to be held to maturity, Amortized Cost | 78,139 | 200,691 | 187,668
Securities to be held to maturity, Amortized Cost | 257,395 | 256,567 | 242,679
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated) | 1,800 | 637 | 559
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 21,468 | 18,164 | 17,485
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 152,154 | 37,719 | 37,963
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) | 74,468 | 203,135 | 189,014
Securities to be held to maturity, Fair Value (Estimated) | $ 249,890 | $ 259,655 | $ 245,021

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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