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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After one but within five years, Held to maturity | $ 1,192 |
Amortized Cost, After five but within ten years, Held to maturity | 9,991 |
Amortized Cost, Held to maturity | 11,183 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 70,415 |
Held-to-maturity, Amortized Cost | 81,598 | $ 84,851
Fair Value of Held-to-maturity Securities |  |
Fair Value, After one but within five years, Held to maturity | 1,097 |
Fair Value, After five but within ten years, Held to maturity | 9,213 |
Fair Value, Held to maturity | 10,310 |
Fair Value, Mortgage-backed securities, Held to maturity | 57,914 |
Held to maturity, Fair Value | $ 68,224 | $ 71,698

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