U.S.Treasury Capital Purchase Program Participation - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended
	May 15, 2009	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Class of Warrant or Right [Line Items]
Sale of preferred stock and a warrant for common stock	$ 21,000,000
Number of cumulative perpetual preferred stock shares	21,000
Liquidation value of cumulative perpetual preferred stock	$ 1,000
Number of common stock shares available to U.S. Treasury under warrant issued	616,438
Preferred stock, par value
Rate of cumulative dividends for the first five years	5.00%
Rate of cumulative dividends for the remaining period	9.00%
Period of common stock warrant				10 years
Exercise price of common stock warrant	5.11
Discount rate	12.00%
Estimated fair value	15,500,000
Fair value of common stock warrant	900,000
Aggregate fair value for preferred stock and the common stock warrant	16,400,000
Aggregate attributable to the preferred stock	94.60%
Aggregate attributable to the common stock warrants	5.40%
Issuance amount allocated to preferred stock	19,900,000
Issuance amount allocated to common stock warrant	1,100,000
Discount on the preferred stock	1,300,000
Period of reduction in net income available to common shareholders	5 years
Reduction from retained earnings resulting from accelerated discount on preferred Stock			600,000
Reduction in shareholders' equity resulting from repurchase of warrant		7,500,000
Repurchase price of warrant				0	7,465,000	0
Minimum [Member]
Class of Warrant or Right [Line Items]
Reduction in net income attributable to common shareholders due to accretion of preferred stock discount	200,000
Maximum [Member]
Class of Warrant or Right [Line Items]
Reduction in net income attributable to common shareholders due to accretion of preferred stock discount	300,000
Stock warrant [Member]
Class of Warrant or Right [Line Items]
Expected dividend yield	1.00%
Risk-free interest rate	1.99%
Expected life	5 years
Expected volatility	53.00%
Weighted average fair value	$ 3.92
Repurchase price of warrant		7,500,000
Preferred Stock [Member]
Class of Warrant or Right [Line Items]
Direct cost associated with transaction	200,000
Repurchase of Preferred Stock			$ 21,000,000