Loans (Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	$ 43,577	$ 38,185
Recorded Investment With Related Allowance	138,486	145,890
Total Recorded Investment	182,063	184,075
Unpaid Contractual Principal Balance	213,124	212,899
Related Allowance	19,870	23,243
Total Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	35,045	30,994
Recorded Investment With Related Allowance	76,250	76,976
Total Recorded Investment	111,295	107,970
Unpaid Contractual Principal Balance	122,647	119,514
Related Allowance	7,357	8,516
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With Related Allowance	277	242
Total Recorded Investment	277	242
Unpaid Contractual Principal Balance	277	242
Related Allowance	21	45
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	6,671	6,193
Recorded Investment With Related Allowance	44,858	48,665
Total Recorded Investment	51,529	54,858
Unpaid Contractual Principal Balance	69,929	71,111
Related Allowance	9,628	11,105
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	31,600	26,741
Recorded Investment With Related Allowance	59,131	56,978
Total Recorded Investment	90,731	83,719
Unpaid Contractual Principal Balance	98,554	91,448
Related Allowance	6,467	7,108
Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	3,445	4,253
Recorded Investment With Related Allowance	17,119	19,998
Total Recorded Investment	20,564	24,251
Unpaid Contractual Principal Balance	24,093	28,066
Related Allowance	890	1,408
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	1,861	998
Recorded Investment With Related Allowance	17,101	20,007
Total Recorded Investment	18,962	21,005
Unpaid Contractual Principal Balance	20,271	22,032
Related Allowance	2,864	3,577
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With Related Allowance	277	242
Total Recorded Investment	277	242
Unpaid Contractual Principal Balance	277	242
Related Allowance	$ 21	$ 45