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Investment Securities - Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in 1 year or less | $ 15,003 |
Due after 1 year but within 5 years | 22,970 |
Due after 5 years but within 10 years | 28,964 |
Due after 10 years | 844 |
Available-for-sale securities, amortized cost basis, Total | 67,781 |
Amortized Cost | 271,831 | $ 245,886
Fair Value |  |
Due in 1 year or less | 14,958 |
Due after 1 year but within 5 years | 22,069 |
Due after 5 years but within 10 years | 25,356 |
Due after 10 years | 682 |
Available-for-sale securities, fair value, Total | 63,065 |
Available-for-sale securities, fair value | 255,227 | 223,555
Amortized Cost |  |
Due in 1 year or less | 16,458 |
Due after 1 year but within 5 years | 134,278 |
Due after 5 years but within 10 years | 178,504 |
Due after 10 years | 18,165 |
Held-to-maturity securities, amortized cost | 347,405 |
Amortized Cost | 386,618 | 399,128
Fair Value |  |
Due in 1 year or less | 16,345 |
Due after 1 year but within 5 years | 127,167 |
Due after 5 years but within 10 years | 160,077 |
Due after 10 years | 15,796 |
Held-to-maturity securities, fair value | 319,385 |
Held-to-maturity, Fair Value | 354,365 | $ 357,521
Mortgage-backed securities |  |
Amortized Cost |  |
Mortgage-backed securities | 204,050 |
Fair Value |  |
Mortgage-backed securities | 192,162 |
Amortized Cost |  |
Mortgage-backed securities | 39,213 |
Fair Value |  |
Mortgage-backed securities | $ 34,980 |

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