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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Amortized Cost	$ 66	$ 127	$ 0
Due in 1 to 5 years, Securities available for sale, Amortized Cost	25,221	36,534	15,670
Due in 5 to 10 years, Securities available for sale, Amortized Cost	62,462	93,134	107,978
Due after 10 years, Securities available for sale, Amortized Cost	215,192	226,095	203,576
Amortized Cost	302,941	355,890	327,224
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Fair Value (Estimated)	66	127	0
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated)	26,159	36,778	15,736
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated)	65,032	95,014	108,698
Due after 10 years, Securities available for sale, Fair Value (Estimated)	221,671	228,601	200,842
Securities available for sale, Fair Value (Estimated)	312,928	360,520	325,276
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Due in 1 year or less, Securities to be held to maturity, Amortized Cost	1,331	1,334	1,429
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost	27,854	25,860	21,096
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost	184,037	179,133	176,967
Due after 10 years, Securities to be held to maturity, Amortized Cost	128,370	75,279	81,727
Securities to be held to maturity, Amortized Cost	341,592	281,606	281,219
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated)	1,337	1,338	1,431
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated)	28,361	26,323	21,203
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated)	189,214	182,834	178,044
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated)	130,336	76,550	81,890
Securities to be held to maturity, Fair Value (Estimated)	$ 349,248	$ 287,045	$ 282,568

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-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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