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Securities Held-To-Maturity - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) bond | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |  |
Held-to-maturity securities, face value | $ 231,577 |  | $ 231,577 |  | $ 234,255
Interest income, including the amortization of discount | 3,600 | $ 3,700 | 10,700 | $ 13,900 |
APL certificates |  |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |  |
Held-to-maturity securities, face value | 192,791 |  | 192,791 |  | $ 192,791
Amount purchased at a discount | $ 119,000 |  | $ 119,000 |  |
Weighted average variable interest rate (as a percent) | 3.94% |  | 3.94% |  |
Estimated weighted average remaining maturity period |  |  | 6 years 9 months 18 days |  |
Weighted average fixed interest rate |  |  | 8.85% |  | 8.85%
After one year through five years | $ 18,200 |  | $ 18,200 |  |
After five years through ten years | $ 174,600 |  | $ 174,600 |  |
APL certificates | Minimum |  |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |  |
Securities maturity term |  |  | 5 years |  |
APL certificates | Maximum |  |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |  |
Securities maturity term |  |  | 10 years |  |
Seven B Piece Bonds |  |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |  |
Estimated weighted average remaining maturity period |  |  | 5 years 10 months 24 days |  |
Bonds retained percentage |  |  | 49.00% |  |
Initial face value of bonds purchased |  |  | $ 106,200 |  |
Number of B Piece bonds | bond |  |  | 7 |  |
Discounted value of bonds purchased |  |  | $ 74,700 |  |
Held-to-maturity securities sold, percentage | 51.00% |  | 51.00% |  |
Agency B Piece Bonds |  |  |  |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |  |  |  |
Weighted average variable interest rate (as a percent) | 3.74% |  | 3.74% |  | 12.20%
After one year through five years | $ 14,800 |  | $ 14,800 |  |
Weighted average effective interest rate (as a percent) | 11.19% |  | 11.19% |  |
Within one year | $ 7,500 |  | $ 7,500 |  |
After ten years | $ 16,500 |  | $ 16,500 |  |

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