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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, Within one year, Held to Maturity | $ 175 |
Amortized Cost, After five but within ten years, Held to maturity | 324 |
Amortized Cost, After ten years, Held to maturity | 6,350 |
Amortized Cost, Held to maturity | 6,849 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 376 |
Held-to-maturity, Amortized Cost | 7,225 | $ 7,656
Fair Value of Held-to-maturity Securities |  |
Fair Value, Within one year, Held to Maturity | 178 |
Fair Value, After five but within ten years, Held to maturity | 344 |
Fair Value, After ten years, Held to maturity | 6,602 |
Fair Value, Held to maturity | 7,124 |
Fair Value, Mortgage-backed securities, Held to maturity | 389 |
Held to maturity, Fair Value | $ 7,513 | $ 7,889

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