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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Amortized Cost of Held-to-maturity Securities
Amortized Cost, After ten years, Held to maturity	$ 6,859
Amortized Cost, Held to maturity	6,859
Amortized Cost, Mortgage-backed securities, Held to maturity	2,705
Held-to-maturity, Amortized Cost	9,564	$ 10,517
Fair Value of Held-to-maturity Securities
Fair Value, After ten years, Held to maturity	7,042
Fair Value, Held to maturity	7,042
Fair Value, Mortgage-backed securities, Held to maturity	2,870
Held to maturity, Fair Value	$ 9,912	$ 10,714

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of investment in held-to-maturity debt securities with a single maturity date, after other than temporary impairment (OTTI) accretion.

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