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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After five but within ten years, Held to maturity | $ 8,294 |
Amortized Cost, After ten years, Held to maturity | 2,953 |
Amortized Cost, Held to maturity | 11,247 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 81,524 |
Held-to-maturity, Amortized Cost | 92,771 | $ 71,213
Fair Value of Held-to-maturity Securities |  |
Fair Value, After five but within ten years, Held to maturity | 7,410 |
Fair Value, After ten years, Held to maturity | 2,551 |
Fair Value, Held to maturity | 9,961 |
Fair Value, Mortgage-backed securities, Held to maturity | 68,551 |
Held to maturity, Fair Value | $ 78,512 | $ 70,446

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