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Loans - Schedule of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,116	$ 1,119	$ 924
Impaired loans with a valuation allowance	943	3,025	1,516
Total impaired loans	2,059	4,144	2,440
Valuation allowance related to impaired loans	261	860	516
Total non-accrual loans	2,615	4,582	3,329
Total loans past-due ninety days or more and still accruing		3
Quarter ended average investment in impaired loans	2,312	4,321	2,532
Year to date average investment in impaired loans	$ 2,312	$ 4,321	$ 3,274

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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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