Allowance for Loan and Lease Losses (Troubled Debt Restructuring) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Financing Receivable, Modifications [Line Items]
Accruing	$ 215,773		$ 226,708
Nonaccruing	61,828		81,333
Total	277,601	333,170	308,041
Commercial
Financing Receivable, Modifications [Line Items]
Accruing	184,065		194,961
Nonaccruing	55,539		72,968
Total	239,604		267,929
Commercial | Construction and Land Development - Commercial
Financing Receivable, Modifications [Line Items]
Accruing	30,659		42,662
Nonaccruing	15,329		14,575
Total	45,988		57,237
Commercial | Commercial Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	135,953		138,081
Nonaccruing	35,433		50,831
Total	171,386		188,912
Commercial | Other Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Accruing	8,103		5,752
Nonaccruing	1,260		444
Total	9,363		6,196
Commercial | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Accruing	9,290		8,222
Nonaccruing	3,517		7,118
Total	12,807		15,340
Commercial | Leases Financing
Financing Receivable, Modifications [Line Items]
Accruing	60		244
Nonaccruing	0		0
Total	60		244
Non-Commercial Loans
Financing Receivable, Modifications [Line Items]
Accruing	31,708		31,747
Nonaccruing	6,289		8,365
Total	37,997		40,112
Non-Commercial Loans | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	27,120		24,181
Nonaccruing	5,820		8,365
Total	32,940		32,546
Non-Commercial Loans | Revolving Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	2,728		49
Nonaccruing	0		0
Total	2,728		49
Non-Commercial Loans | Construction and Land Development - Noncommercial
Financing Receivable, Modifications [Line Items]
Accruing	441		4,592
Nonaccruing	469		0
Total	910		4,592
Non-Commercial Loans | Consumer and Other
Financing Receivable, Modifications [Line Items]
Accruing	1,419		2,925
Nonaccruing	0		0
Total	$ 1,419		$ 2,925