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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After five but within ten years, Held to maturity | $ 7,331 |
Amortized Cost, After ten years, Held to maturity | 4,145 |
Amortized Cost, Held to maturity | 11,476 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 59,737 |
Held-to-maturity, Amortized Cost | 71,213 | $ 7,225
Fair Value of Held-to-maturity Securities |  |
Fair Value, After five but within ten years, Held to maturity | 7,334 |
Fair Value, After ten years, Held to maturity | 4,212 |
Fair Value, Held to maturity | 11,546 |
Fair Value, Mortgage-backed securities, Held to maturity | 58,900 |
Held to maturity, Fair Value | $ 70,446 | $ 7,513

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