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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After five but within ten years, Held to maturity | $ 8,092 |
Amortized Cost, After ten years, Held to maturity | 3,165 |
Amortized Cost, Held to maturity | 11,257 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 83,189 |
Held-to-maturity, Amortized Cost | 94,446 | $ 71,213
Fair Value of Held-to-maturity Securities |  |
Fair Value, After five but within ten years, Held to maturity | 7,429 |
Fair Value, After ten years, Held to maturity | 2,860 |
Fair Value, Held to maturity | 10,289 |
Fair Value, Mortgage-backed securities, Held to maturity | 73,787 |
Held to maturity, Fair Value | $ 84,076 | $ 70,446

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