Trading assets and liabilities (Detail 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative, Nominal Amount	$ 14,000	$ 14,600
Asset, Fair Value	0	0
Liability, Fair Value	52	72
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Nominal Amount	14,000	14,000
Asset, Fair Value	0	0
Liability, Fair Value	52	65
Cross Currency Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Nominal Amount	0	600
Asset, Fair Value	0	0
Liability, Fair Value	$ 0	$ 7

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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