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Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Securities available for sale
Amortized Cost, Due in 1 year or less	$ 2,544	$ 117	$ 66
Fair Value (Estimated), Due in 1 year or less	2,516	120	66
Amortized Cost, Due in 1 to 5 years	12,994	17,718	25,221
Fair Value (Estimated), Due in 1 to 5 years	13,172	17,915	26,159
Amortized Cost, Due in 5 to 10 years	50,007	49,697	62,462
Fair Value (Estimated), Due in 1 to 5 years	50,587	51,001	65,032
Amortized Cost, Due after 10 years	228,715	239,504	215,192
Fair Value (Estimated), Due after 10 years	228,262	244,340	221,671
Amortized Cost	294,260	307,036	302,941
Securities available for sale, Fair Value (Estimated)	294,537	313,376	312,928
Securities to be held to maturity
Amortized Cost, Due in 1 year or less	3,926	3,607	1,331
Fair Value (Estimated), Due in 1 year or less	3,956	3,641	1,337
Amortized Cost, Due in 1 to 5 years	26,992	30,867	27,854
Fair Value (Estimated), Due in 1 to 5 years	27,613	31,792	28,361
Amortized Cost, Due in 5 to 10 years	173,295	183,679	184,037
Fair Value (Estimated), Due in 1 to 5 years	178,069	190,153	189,214
Amortized Cost, Due after 10 years	181,139	147,460	128,370
Fair Value (Estimated), Due after 10 years	179,198	151,548	130,336
Amortized Cost	385,352	365,613	341,592
Securities to be held to maturity, Fair Value (Estimated)	$ 388,836	$ 377,134	$ 349,248

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