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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After one but within five years, Held to maturity | $ 1,191 |
Amortized Cost, After five but within ten years, Held to maturity | 9,984 |
Amortized Cost, Held to maturity | 11,175 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 68,686 |
Held-to-maturity, Amortized Cost | 79,861 | $ 84,851
Fair Value of Held-to-maturity Securities |  |
Fair Value, After one but within five years, Held to maturity | 1,096 |
Fair Value, After five but within ten years, Held to maturity | 9,244 |
Fair Value, Held to maturity | 10,340 |
Fair Value, Mortgage-backed securities, Held to maturity | 58,694 |
Held to maturity, Fair Value | $ 69,034 | $ 71,698

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