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Borrowings - Schedule of Federal Home Loan Bank of Atlanta (FHLB) Advances (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Federal Home Loan Bank Advances [Line Items]
Advances from FHLB, Fair Value Adjustment		$ 1,100,000
Federal Home Loan Bank of Atlanta
Federal Home Loan Bank Advances [Line Items]
Advances from FHLB	$ 48,000,000
Advances from FHLB, Fair Value Adjustment	$ 1,020,050,000
Federal Home Loan Bank of Atlanta | May 23, 2029
Federal Home Loan Bank Advances [Line Items]
Advances from FHLB, Advance Date	May 23, 2019
Advances from FHLB	$ 8,000,000
Advances from FHLB, Fair Value Adjustment	$ 408,788,000
Advances from FHLB, Interest Rate	2.40%
Advances from FHLB, Maturity	May 23, 2029
Advances from FHLB, Rate	Convertible
Advances from FHLB, Call Feature	5/23/2022
Federal Home Loan Bank of Atlanta | December 17, 2029
Federal Home Loan Bank Advances [Line Items]
Advances from FHLB, Advance Date	Dec. 16, 2019
Advances from FHLB	$ 5,000,000
Advances from FHLB, Fair Value Adjustment	$ 280,422,000
Advances from FHLB, Interest Rate	2.37%
Advances from FHLB, Maturity	Dec. 17, 2029
Advances from FHLB, Rate	Convertible
Advances from FHLB, Call Feature	12/17/2021
Federal Home Loan Bank of Atlanta | November 29, 2029
Federal Home Loan Bank Advances [Line Items]
Advances from FHLB, Advance Date	Nov. 29, 2019
Advances from FHLB	$ 5,000,000
Advances from FHLB, Fair Value Adjustment	$ 330,841,000
Advances from FHLB, Interest Rate	2.66%
Advances from FHLB, Maturity	Nov. 29, 2029
Advances from FHLB, Rate	Convertible
Advances from FHLB, Call Feature	11/29/2022
Federal Home Loan Bank of Atlanta | January 21, 2026
Federal Home Loan Bank Advances [Line Items]
Advances from FHLB, Advance Date	Jan. 21, 2021
Advances from FHLB	$ 10,000,000
Advances from FHLB, Interest Rate	0.68%
Advances from FHLB, Maturity	Jan. 21, 2026
Advances from FHLB, Rate	Fixed
Advances from FHLB, Call Feature	None
Federal Home Loan Bank of Atlanta | March 8, 2024
Federal Home Loan Bank Advances [Line Items]
Advances from FHLB, Advance Date	Mar. 08, 2021
Advances from FHLB	$ 10,000,000
Advances from FHLB, Interest Rate	0.54%
Advances from FHLB, Maturity	Mar. 08, 2024
Advances from FHLB, Rate	Fixed
Advances from FHLB, Call Feature	None
Federal Home Loan Bank of Atlanta | May 2, 2025
Federal Home Loan Bank Advances [Line Items]
Advances from FHLB, Advance Date	May 03, 2021
Advances from FHLB	$ 10,000,000
Advances from FHLB, Interest Rate	0.76%
Advances from FHLB, Maturity	May 02, 2025
Advances from FHLB, Rate	Fixed
Advances from FHLB, Call Feature	None

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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