Loans (Impaired Loans) (Details) (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010
Recorded Investment With No Related Allowance	$ 48,131	[1]	$ 48,570	[1]
Recorded Investment With Related Allowance	125,386	[1]	105,717	[1]
Total Recorded Investment	173,517	[1]	154,287	[1]
Unpaid Contractual Principal Balance	194,675		169,623
Related Allowance	17,916		15,226
Commercial and Industrial [Member]
Recorded Investment With No Related Allowance	5,857	[1]	3,707	[1]
Recorded Investment With Related Allowance	33,155	[1]	28,590	[1]
Total Recorded Investment	39,012	[1]	32,297	[1]
Unpaid Contractual Principal Balance	52,102		42,940
Related Allowance	7,168		6,397
Commercial Real Estate [Member]
Recorded Investment With No Related Allowance	25,504	[1]	19,860	[1]
Recorded Investment With Related Allowance	54,906	[1]	43,393	[1]
Total Recorded Investment	80,410	[1]	63,253	[1]
Unpaid Contractual Principal Balance	87,724		66,869
Related Allowance	5,035		3,991
Construction [Member]
Recorded Investment With No Related Allowance	15,981	[1]	24,215	[1]
Recorded Investment With Related Allowance	19,842	[1]	15,854	[1]
Total Recorded Investment	35,823	[1]	40,069	[1]
Unpaid Contractual Principal Balance	36,297		40,867
Related Allowance	2,709		2,150
Total Commercial Real Estate Loans [Member]
Recorded Investment With No Related Allowance	41,485	[1]	44,075	[1]
Recorded Investment With Related Allowance	74,748	[1]	59,247	[1]
Total Recorded Investment	116,233	[1]	103,322	[1]
Unpaid Contractual Principal Balance	124,021		107,736
Related Allowance	7,744		6,141
Residential Mortgage [Member]
Recorded Investment With No Related Allowance	789	[1]	788	[1]
Recorded Investment With Related Allowance	17,401	[1]	17,797	[1]
Total Recorded Investment	18,190	[1]	18,585	[1]
Unpaid Contractual Principal Balance	18,470		18,864
Related Allowance	3,000		2,683
Home Equity [Member]
Recorded Investment With Related Allowance	82	[1]	83	[1]
Total Recorded Investment	82	[1]	83	[1]
Unpaid Contractual Principal Balance	82		83
Related Allowance	4		5
Total Consumer Loans [Member]
Recorded Investment With Related Allowance	82	[1]	83	[1]
Total Recorded Investment	82	[1]	83	[1]
Unpaid Contractual Principal Balance	82		83
Related Allowance	$ 4		$ 5

[1] Recorded investment equals the aggregate carrying value of the applicable loans.