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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	Mar. 31, 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	158
Amortized Cost, After five but within ten years, Held to Maturity	342
Amortized Cost, After ten years, Held to Maturity	6,871
Amortized Cost, Held to Maturity	7,371
Amortized Cost, Mortgage-backed securities, Held to Maturity	9,236
Total Amortized Cost, Held to Maturity	16,607	17,295
Fair Value, Within one year, Held to Maturity
Fair Value, After one but within five years, Held to Maturity	162
Fair Value, After five but within ten years, Held to Maturity	353
Fair Value, After ten years, Held to Maturity	6,360
Fair Value, Held to Maturity	6,875
Fair Value, Mortgage-backed securities, Held to Maturity	9,722
Held to Maturity, Fair Value	$ 16,597	$ 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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Amount of held-to-maturity debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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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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