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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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