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Borrowings - Schedule of Federal Home Loan Bank of Atlanta (FHLB) Advances (Details) - Federal Home Loan Bank of Atlanta
 12 Months Ended
Dec. 31, 2020
USD ($)
Federal Home Loan Bank Advances [Line Items]  
Advances from FHLB $ 18,000,000
Advances from FHLB, Fair Value Adjustment $ 1,116,617,000
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 $ 449,218,000
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
October 25, 2019  
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 $ 306,175,000
Advances from FHLB, Interest Rate 2.66%
Advances from FHLB, Maturity Oct. 25, 2019
Advances from FHLB, Rate Convertible
Advances from FHLB, Call Feature 11/29/2022
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 $ 361,224,000
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