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Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Securities available for sale
Amortized Cost, Due in 1 year or less	$ 0	$ 117	$ 584
Fair Value (Estimated), Due in 1 year or less	0	120	573
Amortized Cost, Due in 1 to 5 years	5,683	17,718	26,736
Fair Value (Estimated), Due in 1 to 5 years	5,909	17,915	27,310
Amortized Cost, Due in 5 to 10 years	38,136	49,697	63,422
Fair Value (Estimated), Due in 1 to 5 years	39,018	51,001	65,575
Amortized Cost, Due after 10 years	260,921	239,504	211,771
Fair Value (Estimated), Due after 10 years	261,320	244,340	218,042
Fair Value (Estimated)	306,247	313,376	311,500
Amortized Cost	304,740	307,036	302,513
Securities to be held to maturity
Amortized Cost, Due in 1 year or less	3,813	3,607	1,860
Fair Value (Estimated), Due in 1 year or less	3,800	3,641	1,863
Amortized Cost, Due in 1 to 5 years	20,629	30,867	32,303
Fair Value (Estimated), Due in 1 to 5 years	21,477	31,792	33,367
Amortized Cost, Due in 5 to 10 years	167,850	183,679	179,877
Fair Value (Estimated), Due in 1 to 5 years	173,699	190,153	185,994
Amortized Cost, Due after 10 years	183,889	147,460	127,922
Fair Value (Estimated), Due after 10 years	184,478	151,548	131,001
Amortized Cost	376,181	365,613	341,962
Securities to be held to maturity, Fair Value (Estimated)	$ 383,454	$ 377,134	$ 352,225

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