Income Taxes - Reconciliation of Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Taxes computed at statutory rate	$ (1,794)	$ (931)	$ 867
Increase (decrease) resulting from:
Tax-exempt interest income	(532)	(539)	(532)
Income from BOLI	(200)	(170)	(195)
Federal tax credits	(298)	(298)	(372)
Other	(590)	(263)	140
Change in valuation allowance	8,140
Total income tax expense (benefit)	$ 4,726us-gaap_IncomeTaxExpenseBenefit	$ (2,201)us-gaap_IncomeTaxExpenseBenefit	$ (92)us-gaap_IncomeTaxExpenseBenefit
Taxes computed at statutory rate, %	(34.00%)	(34.00%)	34.00%
Tax-exempt interest income, %	(10.00%)	(20.00%)	(21.00%)
Income from BOLI, %	(4.00%)	(6.00%)	(8.00%)
Federal tax credits, %	(6.00%)	(11.00%)	(15.00%)
Other, %	(10.00%)	(9.00%)	6.00%
Change in valuation allowance, %	154.00%
Total income tax benefit, %	90.00%	(80.00%)	(4.00%)

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