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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Amortized Cost	$ 189	$ 0	$ 0
Due in 1 to 5 years, Securities available for sale, Amortized Cost	36,304	13,501	13,961
Due in 5 to 10 years, Securities available for sale, Amortized Cost	91,242	83,954	69,317
Due after 10 years, Securities available for sale, Amortized Cost	194,398	226,354	230,470
Amortized Cost	322,133	323,809	313,748
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Fair Value (Estimated)	189	0	0
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated)	36,703	13,518	13,886
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated)	93,419	83,326	67,434
Due after 10 years, Securities available for sale, Fair Value (Estimated)	196,487	220,572	220,867
Securities available for sale, Fair Value (Estimated)	326,798	317,416	302,187
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Due in 1 year or less, Securities to be held to maturity, Amortized Cost	1,241	1,432	1,796
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost	23,460	20,717	21,463
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost	184,234	157,544	155,997
Due after 10 years, Securities to be held to maturity, Amortized Cost	89,851	75,970	78,139
Securities to be held to maturity, Amortized Cost	298,786	255,663	257,395
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated)	1,245	1,433	1,800
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated)	23,920	20,778	21,468
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated)	188,811	155,313	152,154
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated)	92,671	73,376	74,468
Securities to be held to maturity, Fair Value (Estimated)	$ 306,647	$ 250,900	$ 249,890

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

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