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Loans - Schedule of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,209	$ 253	$ 924
Impaired loans with a valuation allowance	477	1,308	1,516
Total impaired loans	1,686	1,561	2,440
Valuation allowance related to impaired loans	252	423	516
Total non-accrual loans	1,634	2,908	3,329
Total loans past-due ninety days or more and still accruing	0	0	0
Quarter ended average investment in impaired loans	1,788	1,879	2,532
Year to date average investment in impaired loans	$ 1,989	$ 3,521	$ 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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