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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 8,098 |
Amortized Cost, After ten years, Held to maturity | 3,168 |
Amortized Cost, Held to maturity | 11,266 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 84,563 |
Held-to-maturity, Amortized Cost | 95,829 | $ 71,213
Fair Value of Held-to-maturity Securities |  |
Fair Value, After five but within ten years, Held to maturity | 7,657 |
Fair Value, After ten years, Held to maturity | 2,986 |
Fair Value, Held to maturity | 10,643 |
Fair Value, Mortgage-backed securities, Held to maturity | 78,637 |
Held to maturity, Fair Value | $ 89,280 | $ 70,446

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