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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	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Within one year, Held to Maturity	$ 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
Amortized Cost, After one but within five years, Held to maturity	325us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Amortized Cost, After five but within ten years, Held to maturity	176us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
Amortized Cost, After ten years, Held to maturity	6,869us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
Amortized Cost, Held to maturity	7,370us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis
Amortized Cost, Mortgage-backed securities, Held to maturity	7,295us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount
Total Amortized Cost, Held to maturity	14,665us-gaap_HeldToMaturitySecurities	17,295us-gaap_HeldToMaturitySecurities
Fair Value, Within one year, Held to Maturity	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
Fair Value, After one but within five years, Held to maturity	330us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Fair Value, After five but within ten years, Held to maturity	180us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Fair Value, After ten years, Held to maturity	6,927us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
Fair Value, Held to maturity	7,437us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue
Fair Value, Mortgage-backed securities, Held to maturity	7,778us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
Held to maturity, Fair Value	$ 15,215us-gaap_HeldToMaturitySecuritiesFairValue	$ 17,175us-gaap_HeldToMaturitySecuritiesFairValue

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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- Definition

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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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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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 after the tenth fiscal year following the latest fiscal year.

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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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Fair value of investment in held-to-maturity debt securities with a single maturity date.

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Fair value of held-to-maturity debt securities maturing in the next 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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