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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After one but within five years, Held to maturity | $ 1,186 |
Amortized Cost, After five but within ten years, Held to maturity | 9,643 |
Amortized Cost, Held to maturity | 10,829 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 64,308 |
Held to maturity, Amortized Cost | 75,137 | $ 78,184
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 | 8,830 |
Fair Value, Held to maturity | 9,926 |
Fair Value, Mortgage-backed securities, Held to maturity | 54,327 |
Held to maturity, Fair Value | $ 64,253 | $ 65,152

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