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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 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 | $ 34 | $ 111 | $ 26
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 9,349 | 841 | 1,722
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 71,309 | 29,003 | 34,382
Due after 10 years, Securities available for sale, Amortized Cost | 230,549 | 270,594 | 269,650
Equity securities, Amortized Cost | 2,978 | 3,296 | 3,266
Amortized Cost | 314,219 |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Fair Value (Estimated) | 34 | 112 | 26
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 9,341 | 842 | 1,758
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 69,745 | 29,177 | 35,099
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 222,950 | 266,627 | 267,936
Other equity securities | 2,978 | 3,414 | 3,327
Securities available for sale, Fair Value (Estimated) | 305,048 |  |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Amortized Cost | 1,327 | 635 | 707
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 23,621 | 18,059 | 14,536
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 155,096 | 37,182 | 41,373
Due after 10 years, Securities to be held to maturity, Amortized Cost | 80,033 | 200,691 | 187,507
Securities to be held to maturity, Amortized Cost | 260,077 | 256,567 | 244,123
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated) | 1,329 | 637 | 710
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 23,698 | 18,164 | 14,813
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 153,240 | 37,719 | 42,251
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) | 78,049 | 203,135 | 188,464
Securities to be held to maturity, Fair Value (Estimated) | $ 256,316 | $ 259,655 | $ 246,238

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