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Investments Securities - Amortized Cost and Fair Values of Investments in Debt Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 40 | $ 100,041
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2) | (537)
Fair Value | 38 | 99,504
Allowance for Credit Losses | 0 | 0
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 48,582 |
Fair Value | 49,159 |
Amortized Cost | 48,622 | 150,901
Gross Unrealized Gains | 711 | 467
Gross Unrealized Losses | (136) | (823)
Fair Value | 49,197 | 150,545
Allowance for Credit Losses | 0 | 0
U.S. Treasury securities |  |
Available-for-sale |  |
Amortized Cost |  | 99,996
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (535)
Fair Value |  | 99,461
Allowance for Credit Losses |  | 0
U.S. Agency collateralized mortgage obligations |  |
Available-for-sale |  |
Amortized Cost | 40 | 45
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2) | (2)
Fair Value | 38 | 43
Allowance for Credit Losses | 0 | 0
U.S. Agency residential mortgage-backed securities |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 48,582 | 50,860
Gross Unrealized Gains | 711 | 467
Gross Unrealized Losses | (134) | (286)
Fair Value | 49,159 | 51,041
Allowance for Credit Losses | $ 0 | $ 0

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