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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost of Held-to-maturity Securities |  |
Amortized Cost, After five but within ten years, Held to maturity | $ 324 |
Amortized Cost, After ten years, Held to maturity | 6,526 |
Amortized Cost, Held to maturity | 6,850 |
Amortized Cost, Mortgage-backed securities, Held to maturity | 447 |
Held-to-maturity, Amortized Cost | 7,297 | $ 7,656
Fair Value of Held-to-maturity Securities |  |
Fair Value, After five but within ten years, Held to maturity | 346 |
Fair Value, After ten years, Held to maturity | 6,802 |
Fair Value, Held to maturity | 7,148 |
Fair Value, Mortgage-backed securities, Held to maturity | 463 |
Held to maturity, Fair Value | $ 7,611 | $ 7,889

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