Loans - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2013
Receivables [Abstract]
Minimum percentage of concentrations of loans	10.00%	10.00%		10.00%
Concentrations of loans	$ 0	$ 0		$ 0
Allowance for loan losses	8,913,000	8,682,000	10,600,000	8,682,000
Ratio of the allowance for loan losses to total loans	1.63%		1.95%	1.57%
Company's annualized net charge off ratios	0.11%	0.66%	0.33%
Ratios of allowance for loan losses to non-accrual loans	88.85%	86.25%	150.35%	86.25%
Annual reviews of loan to ascertain the borrowers continued ability to service	1,000,000
Loans past due period for classify to risk grade	60 days
Loans past due period for classify to substandard grade	12 months
Company's impaired loans	39,045,000	42,644,000	43,700,000	42,644,000
Related Allowance	2,016,000	1,929,000	2,700,000	1,929,000
Total performing TDR	$ 0	$ 0		$ 0