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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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