Loans (Allowance for Loan Losses Disaggregated on the Basis of Impairment Methodology) (Details) (USD $) In Thousands	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009
Loans individually evaluated for impairment	$ 37,170			$ 54,756
Loans collectively evaluated for impairment	85,571			70,686
Balance at June 30	122,741	124,321	126,316	125,442	125,369	125,309
Commercial And Industrial [Member]
Loans individually evaluated for impairment	32,981			44,283
Loans collectively evaluated for impairment	23,585			21,010
Balance at June 30	56,566	52,800	57,789	65,293	63,576	57,394
Commercial Real Estate [Member]
Loans individually evaluated for impairment	4,089			10,473
Loans collectively evaluated for impairment	16,812			20,756
Balance at June 30	20,901	24,551	28,534	31,229	30,259	28,514
Consumer Real Estate [Member]
Loans individually evaluated for impairment	100
Loans collectively evaluated for impairment	3,583			2,467
Balance at June 30	3,683	3,485	3,223	2,467	2,430	2,560
Consumer And Other [Member]
Loans collectively evaluated for impairment	12,611			18,763
Balance at June 30	12,611	12,941	11,974	18,763	19,689	16,929
Unallocated [Member]
Loans collectively evaluated for impairment	28,980			7,690
Balance at June 30	$ 28,980	$ 30,544	$ 24,796	$ 7,690	$ 9,415	$ 19,912