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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Within one year, Held to Maturity
Amortized Cost, After one but within five years, Held to maturity	325
Amortized Cost, After five but within ten years, Held to maturity	176
Amortized Cost, After ten years, Held to maturity	6,869
Amortized Cost, Held to maturity	7,370
Amortized Cost, Mortgage-backed securities, Held to maturity	7,894
Total Amortized Cost, Held to maturity	15,264	17,295
Fair Value, Within one year, Held to Maturity
Fair Value, After one but within five years, Held to maturity	333
Fair Value, After five but within ten years, Held to maturity	182
Fair Value, After ten years, Held to maturity	6,662
Fair Value, Held to maturity	7,177
Fair Value, Mortgage-backed securities, Held to maturity	8,339
Held to maturity, Fair Value	$ 15,516	$ 17,175

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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 in the sixth fiscal year through 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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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the fifth through tenth fiscal year following the latest fiscal year.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth 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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