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Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in 1 year or less	$ 117	$ 127
Fair Value (Estimated), Due in 1 year or less	120	127
Amortized Cost, Due in 1 to 5 years	17,718	36,534
Fair Value (Estimated), Due in 1 to 5 years	17,915	36,778
Amortized Cost, Due in 5 to 10 years	49,697	93,134
Fair Value (Estimated), Due in 1 to 5 years	51,001	95,014
Amortized Cost, Due after 10 years	239,504	226,095
Fair Value (Estimated), Due after 10 years	244,340	228,601
Securities available-for-sale, Amortized Cost	307,036	355,890
Fair Value (Estimated)	313,376	360,520
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost, Due in 1 year or less	3,607	1,334
Fair Value (Estimated), Due in 1 year or less	3,641	1,338
Amortized Cost, Due in 1 to 5 years	30,867	25,860
Fair Value (Estimated), Due in 1 to 5 years	31,792	26,323
Amortized Cost, Due in 5 to 10 years	183,679	179,133
Fair Value (Estimated), Due in 1 to 5 years	190,153	182,834
Amortized Cost, Due after 10 years	147,460	75,279
Fair Value (Estimated), Due after 10 years	151,548	76,550
Amortized Cost	365,613	281,606
Fair Value (Estimated)	$ 377,134	$ 287,045

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-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

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