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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After one but within five years, Held to maturity | $ 6,186 |
Amortized Cost, After five but within ten years, Held to maturity | 4,608 |
Amortized Cost, Held to maturity | 10,794 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 57,929 |
Held to maturity, Amortized Cost | 68,723 | $ 72,047
Fair Value of Held-to-maturity Securities |  |
Fair Value, After one but within five years, Held to maturity | 5,852 |
Fair Value, After five but within ten years, Held to maturity | 4,356 |
Fair Value, Held to maturity | 10,208 |
Fair Value, Mortgage-backed securities, Held to maturity | 49,103 |
Held to maturity, Fair Value | $ 59,311 | $ 62,798

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