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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After one but within five years, Held to maturity | $ 3,212 |
Amortized Cost, After five but within ten years, Held to maturity | 7,609 |
Amortized Cost, Held to maturity | 10,821 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 62,465 |
Held to maturity, Amortized Cost | 73,286 | $ 78,184
Fair Value of Held-to-maturity Securities |  |
Fair Value, After one but within five years, Held to maturity | 2,939 |
Fair Value, After five but within ten years, Held to maturity | 7,231 |
Fair Value, Held to maturity | 10,170 |
Fair Value, Mortgage-backed securities, Held to maturity | 53,375 |
Held to maturity, Fair Value | $ 63,545 | $ 65,152

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