Non Accrual Loans and Loans Past Due 90 Days Still on Accrual (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Non Accrual Loans and Leases Status [Line Items]
Specific allowance on non accrual loans	$ 63	$ 95