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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
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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 | $ 0 | $ 61
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 15,670 | 13,501 | 6,502
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 107,978 | 83,954 | 66,434
Due after 10 years, Securities available for sale, Amortized Cost | 203,576 | 226,354 | 235,703
Amortized Cost | 327,224 | 323,809 | 308,700
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 | 0 | 61
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 15,736 | 13,518 | 6,492
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 108,698 | 83,326 | 65,234
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 200,842 | 220,572 | 229,052
Securities available for sale, Fair Value (Estimated) | 325,276 | 317,416 | 300,839
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Amortized Cost | 1,429 | 1,432 | 634
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 21,096 | 20,717 | 25,692
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 176,967 | 157,544 | 145,297
Due after 10 years, Securities to be held to maturity, Amortized Cost | 81,727 | 75,970 | 87,067
Securities to be held to maturity, Amortized Cost | 281,219 | 255,663 | 258,690
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated) | 1,431 | 1,433 | 635
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 21,203 | 20,778 | 25,796
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 178,044 | 155,313 | 144,211
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) | 81,890 | 73,376 | 85,209
Securities to be held to maturity, Fair Value (Estimated) | $ 282,568 | $ 250,900 | $ 255,851

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