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Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Securities available for sale
Amortized Cost, Due in 1 year or less	$ 0	$ 117	$ 7,097
Fair Value (Estimated), Due in 1 year or less	0	120	7,159
Amortized Cost, Due in 1 to 5 years	6,285	17,718	23,789
Fair Value (Estimated), Due in 1 to 5 years	6,529	17,915	24,260
Amortized Cost, Due in 5 to 10 years	37,971	49,697	58,430
Fair Value (Estimated), Due in 1 to 5 years	38,400	51,001	60,086
Amortized Cost, Due after 10 years	265,762	239,504	243,836
Fair Value (Estimated), Due after 10 years	264,295	244,340	248,635
Fair Value (Estimated)	309,224	313,376	340,140
Amortized Cost	310,018	307,036	333,152
Securities to be held to maturity
Amortized Cost, Due in 1 year or less	3,788	3,607	2,454
Fair Value (Estimated), Due in 1 year or less	3,763	3,641	2,462
Amortized Cost, Due in 1 to 5 years	18,616	30,867	32,595
Fair Value (Estimated), Due in 1 to 5 years	19,426	31,792	33,683
Amortized Cost, Due in 5 to 10 years	171,039	183,679	176,400
Fair Value (Estimated), Due in 1 to 5 years	176,007	190,153	182,370
Amortized Cost, Due after 10 years	182,256	147,460	120,513
Fair Value (Estimated), Due after 10 years	180,601	151,548	123,547
Amortized Cost	375,699	365,613	331,962
Securities to be held to maturity, Fair Value (Estimated)	$ 379,797	$ 377,134	$ 342,062

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