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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
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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