Loans (Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	$ 38,185	$ 48,570
Recorded Investment With Related Allowance	145,890	105,717
Total Recorded Investment	184,075	154,287
Unpaid Contractual Principal Balance	212,899	169,623
Related Allowance	23,243	15,226
Total Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	30,994	44,075
Recorded Investment With Related Allowance	76,976	59,247
Total Recorded Investment	107,970	103,322
Unpaid Contractual Principal Balance	119,514	107,736
Related Allowance	8,516	6,141
Total Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With Related Allowance	242	83
Total Recorded Investment	242	83
Unpaid Contractual Principal Balance	242	83
Related Allowance	45	5
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	6,193	3,707
Recorded Investment With Related Allowance	48,665	28,590
Total Recorded Investment	54,858	32,297
Unpaid Contractual Principal Balance	71,111	42,940
Related Allowance	11,105	6,397
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	26,741	19,860
Recorded Investment With Related Allowance	56,978	43,393
Total Recorded Investment	83,719	63,253
Unpaid Contractual Principal Balance	91,448	66,869
Related Allowance	7,108	3,991
Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	4,253	24,215
Recorded Investment With Related Allowance	19,998	15,854
Total Recorded Investment	24,251	40,069
Unpaid Contractual Principal Balance	28,066	40,867
Related Allowance	1,408	2,150
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	998	788
Recorded Investment With Related Allowance	20,007	17,797
Total Recorded Investment	21,005	18,585
Unpaid Contractual Principal Balance	22,032	18,864
Related Allowance	3,577	2,683
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With Related Allowance	242	83
Total Recorded Investment	242	83
Unpaid Contractual Principal Balance	242	83
Related Allowance	$ 45	$ 5