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Income taxes - Reconciliation of Effective Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate									$ 2,110	$ 4,640	$ 4,612
Tax exempt interest, net									(1,428)	(1,432)	(1,458)
Bank owned life insurance income									(329)	(171)	(167)
Disallowed merger costs									266
Other, net									(134)	21	47
Total	$ (1,277)	$ 392	$ 633	$ 737	$ 757	$ 761	$ 721	$ 819	$ 485	$ 3,058	$ 3,034

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Income Tax Reconciliation Nondeductible Expense Merger Costs

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible life insurance expense.

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