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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment securities
Amortized Cost, After ten years, Held to maturity	$ 6,862
Amortized Cost, Held to maturity	6,862
Amortized Cost, Mortgage-backed securities, Held to maturity	3,655
Held-to-maturity, Amortized Cost	10,517	$ 12,109
Fair Value, After ten years, Held to maturity	6,867
Fair Value, Held to maturity	6,867
Fair Value, Mortgage-backed securities, Held to maturity	3,847
Held to maturity, Fair Value	$ 10,714	$ 12,606

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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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