Stock Incentive Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended						3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jun. 16, 2009	Mar. 31, 2014 Parkvale Financial Corporation [Member]	Mar. 31, 2014 Annapolis Bancorp, Inc. [Member]	Apr. 06, 2013 Annapolis Bancorp, Inc. [Member]	Mar. 31, 2014 Restricted Stock [Member]	Mar. 31, 2013 Restricted Stock [Member]	Mar. 31, 2014 Employee Stock Option [Member]	Mar. 31, 2013 Employee Stock Option [Member]	Mar. 31, 2014 Service-Based Awards [Member]	Mar. 31, 2014 Performance-Based Awards [Member]	Mar. 31, 2014 Discretionary Service-Based Awards [Member]	Mar. 31, 2014 Warrant Expires In 2019 [Member]	Apr. 06, 2013 Warrant Expires In 2019 [Member] Annapolis Bancorp, Inc. [Member]	Mar. 24, 2014 Warrant Expires in 2018 [Member] Parkvale Financial Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards issued		295,705
Aggregate, weighted average grant date fair value		$ 3,472
Common stock shares available under Incentive Compensation Plans	2,467,326
Vesting period of awards expensed, years									10 years		3 years	4 years	5 years
Share-based compensation expense related to restricted stock awards							$ 532	$ 1,083
Tax benefit related to restricted stock awards							186	379
Total fair value of awards vested							8,631	8,259
Unrecognized compensation cost related to unvested restricted stock awards	4,159						4,159				1,390	2,769
Amount subject to accelerated vesting under Incentive Compensation Plan							56
Stock options exercised	87,332								87,332
Stock options granted
Intrinsic value of outstanding and exercisable stock options	$ 3,012
Maximum common shares available for purchase under warrants	1,302,083		651,042
Warrant issued, exercise price						3.57								11.52	3.57	5.81
Warrant issued				819,640	342,564