Condensed Consolidated Statements of Changes In Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Warrants	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2010	$ 407,569	$ 24,047	$ 3,699	$ 177,344	$ 205,099	$ (2,620)
Net income	26,844	0	0	0	26,844	0
Other comprehensive income, net of tax:	15,767	0	0	0	0	15,767
Common stock dividends ($0.34 and $0.24 per share for nine month ended September 30, 2012 and 2011 respectively)	(5,829)	0	0	0	(5,829)	0
Stock compensation expense	942	0	0	942	0	0
Stock warrant redemption	(4,449)	0	(3,699)	(750)	0	0
Common stock issued pursuant to:
Stock option plan (1,217 and 1,765 shares for nine month ended September 30, 2012 and 2011 respectively)	21	2	0	19	0	0
Employee stock purchase plan (24,295 and 24,121 shares for nine month ended September 30, 2012 and 2011 respectively)	376	24	0	352	0	0
Director stock purchase plan (1,083 and 1,833 shares for nine month ended September 30, 2012 and 2011 respectively)	32	2	0	30	0	0
Restricted stock (46,445 and 28,450 shares for nine month ended September 30, 2012 and 2011 respectively)	(148)	28	0	(176)	0	0
Purchase of treasury shares - 23,592 shares	(334)	(24)	0	(310)	0	0
Balances at Sep. 30, 2011	440,791	24,079	0	177,451	226,114	13,147
Balances at Dec. 31, 2011	446,109	24,091	0	177,828	230,942	13,248
Net income	26,673	0	0	0	26,673	0
Other comprehensive income, net of tax:	3,185	0	0	0	0	3,185
Common stock dividends ($0.34 and $0.24 per share for nine month ended September 30, 2012 and 2011 respectively)	(8,371)	0	0	0	(8,371)	0
Stock compensation expense	1,132	0	0	1,132	0	0
Common stock issued pursuant to:
Acquisition of CommerceFirst Bancorp, Inc. - 732,054 shares	13,023	732	0	12,291	0	0
Stock option plan (1,217 and 1,765 shares for nine month ended September 30, 2012 and 2011 respectively)	15	1	0	14	0	0
Employee stock purchase plan (24,295 and 24,121 shares for nine month ended September 30, 2012 and 2011 respectively)	372	24	0	348	0	0
Director stock purchase plan (1,083 and 1,833 shares for nine month ended September 30, 2012 and 2011 respectively)	19	1	0	18	0	0
Restricted stock (46,445 and 28,450 shares for nine month ended September 30, 2012 and 2011 respectively)	(347)	47	0	(394)	0	0
Balances at Sep. 30, 2012	$ 481,810	$ 24,896	$ 0	$ 191,237	$ 249,244	$ 16,433