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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Within one year, Held to Maturity	$ 0
Amortized Cost, After one but within five years, Held to maturity	326
Amortized Cost, After five but within ten years, Held to maturity	176
Amortized Cost, After ten years, Held to maturity	6,867
Amortized Cost, Held to maturity	7,369
Amortized Cost, Mortgage-backed securities, Held to maturity	6,257
Total Amortized Cost, Held to maturity	13,626	$ 14,665
Fair Value, Within one year, Held to Maturity	0
Fair Value, After one but within five years, Held to maturity	330
Fair Value, After five but within ten years, Held to maturity	180
Fair Value, After ten years, Held to maturity	6,909
Fair Value, Held to maturity	7,419
Fair Value, Mortgage-backed securities, Held to maturity	6,685
Held to maturity, Fair Value	$ 14,104	$ 15,215

X

- Definition

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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