Loans (Activity in the Allowance for Possible Loan Losses) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Beginning balance	$ 124,321	$ 125,369	$ 126,316	$ 125,309
Provision for loan losses	8,985	8,650	18,435	22,221
Charge-offs	(13,126)	(11,421)	(27,723)	(27,227)
Recoveries	2,561	2,844	5,713	5,139
Net charge-offs	(10,565)	(8,577)	(22,010)	(22,088)
Ending balance	122,741	125,442	122,741	125,442
Commercial And Industrial [Member]
Beginning balance	52,800	63,576	57,789	57,394
Provision for loan losses	8,484	7,323	10,325	22,138
Charge-offs	(5,576)	(6,328)	(13,173)	(15,502)
Recoveries	858	722	1,625	1,263
Net charge-offs	(4,718)	(5,606)	(11,548)	(14,239)
Ending balance	56,566	65,293	56,566	65,293
Commercial Real Estate [Member]
Beginning balance	24,551	30,259	28,534	28,514
Provision for loan losses	908	2,038	246	7,149
Charge-offs	(4,694)	(1,657)	(8,572)	(5,071)
Recoveries	136	589	693	637
Net charge-offs	(4,558)	(1,068)	(7,879)	(4,434)
Ending balance	20,901	31,229	20,901	31,229
Consumer Real Estate [Member]
Beginning balance	3,485	2,430	3,223	2,560
Provision for loan losses	560	620	1,352	853
Charge-offs	(459)	(686)	(1,279)	(1,061)
Recoveries	97	103	387	115
Net charge-offs	(362)	(583)	(892)	(946)
Ending balance	3,683	2,467	3,683	2,467
Consumer And Other [Member]
Beginning balance	12,941	19,689	11,974	16,929
Provision for loan losses	597	394	2,328	4,303
Charge-offs	(2,397)	(2,750)	(4,699)	(5,593)
Recoveries	1,470	1,430	3,008	3,124
Net charge-offs	(927)	(1,320)	(1,691)	(2,469)
Ending balance	12,611	18,763	12,611	18,763
Unallocated [Member]
Beginning balance	30,544	9,415	24,796	19,912
Provision for loan losses	(1,564)	(1,725)	4,184	(12,222)
Ending balance	$ 28,980	$ 7,690	$ 28,980	$ 7,690