Stock Incentive Plans - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 16, 2009	Dec. 31, 2013 Parkvale Financial Corporation [Member]	Jan. 02, 2012 Parkvale Financial Corporation [Member]	Dec. 31, 2013 Annapolis Bancorp, Inc. [Member]	Apr. 06, 2013 Annapolis Bancorp, Inc. [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 Employee Stock Option [Member]	Dec. 31, 2012 Employee Stock Option [Member]	Dec. 31, 2011 Employee Stock Option [Member]	Dec. 31, 2013 Service-Based Awards [Member]	Dec. 31, 2013 Performance-Based Awards [Member]	Dec. 31, 2013 Discretionary Service-Based Awards [Member]	Dec. 31, 2013 Warrant Expires In 2019 [Member]	Apr. 06, 2013 Warrant Expires In 2019 [Member] Annapolis Bancorp, Inc. [Member]	Dec. 31, 2013 Warrant Expires in 2018 [Member] Parkvale Financial Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards issued	361,664	321,295	407,980
Aggregate, weighted average grant date fair value	$ 4,016	$ 3,884	$ 4,110
Common stock shares available under Incentive Compensation Plans	2,716,902
Vesting period of awards expensed, years												10 years			3 years	4 years	5 years
Share-based compensation expense related to restricted stock awards									$ 5,063	$ 3,758	$ 4,396
Tax benefit related to restricted stock awards									1,772	1,315	1,538
Total fair value of awards vested									8,259	2,193	1,767
Unrecognized compensation cost related to unvested restricted stock awards	4,891								4,891						1,671	3,220
Amount subject to accelerated vesting under Incentive Compensation Plan									71
Stock options exercised	69,429	182,188	8,389									69,429	182,188	8,389
Stock options granted
Intrinsic value of outstanding and exercisable stock options	$ 559
Maximum common shares available for purchase under warrants	1,302,083			651,042
Warrant issued, exercise price						5.81		3.57										11.52	3.57	5.81
Warrant issued					819,640		342,564