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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After five but within ten years, Held to maturity | $ 8,869 |
Amortized Cost, After ten years, Held to maturity | 2,350 |
Amortized Cost, Held to maturity | 11,219 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 76,992 |
Held-to-maturity, Amortized Cost | 88,211 | $ 91,179
Fair Value of Held-to-maturity Securities |  |
Fair Value, After five but within ten years, Held to maturity | 8,263 |
Fair Value, After ten years, Held to maturity | 2,169 |
Fair Value, Held to maturity | 10,432 |
Fair Value, Mortgage-backed securities, Held to maturity | 63,581 |
Held to maturity, Fair Value | $ 74,013 | $ 76,563

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