Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Recorded Investment Based on Performance of Loans by Class) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	$ 11,828,943		$ 10,521,377
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	11,710,860		10,401,293
Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	118,083		120,084
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	2,914,798		2,498,313
Commercial [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	2,893,061		2,479,295
Commercial [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	21,737		19,018
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,628,203		1,450,451
Commercial [Member] | Commercial and Industrial [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,608,794		1,434,297
Commercial [Member] | Commercial and Industrial [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	19,409		16,154
Commercial [Member] | Franchise [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	196,395		142,775
Commercial [Member] | Franchise [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	194,603		140,983
Commercial [Member] | Franchise [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,792		1,792
Commercial [Member] | Mortgage Warehouse Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	215,076		180,450
Commercial [Member] | Mortgage Warehouse Lines of Credit [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	215,076		180,450
Commercial [Member] | Mortgage Warehouse Lines of Credit [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0		0
Commercial [Member] | Community Advantage - Homeowners Association [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	81,496		77,504
Commercial [Member] | Community Advantage - Homeowners Association [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	81,496		77,504
Commercial [Member] | Community Advantage - Homeowners Association [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0		0
Commercial [Member] | Aircraft [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	17,364		20,397
Commercial [Member] | Aircraft [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	17,364		20,397
Commercial [Member] | Aircraft [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0		0
Commercial [Member] | Asset-Based Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	572,438		465,737
Commercial [Member] | Asset-Based Lending [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	571,902		464,665
Commercial [Member] | Asset-Based Lending [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	536		1,072
Commercial [Member] | Municipal [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	91,824		78,319
Commercial [Member] | Municipal [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	91,824		78,319
Commercial [Member] | Municipal [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0		0
Commercial [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	90,443		72,134
Commercial [Member] | Leases [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	90,443		72,134
Commercial [Member] | Leases [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0		0
Commercial [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	16,549		2,125
Commercial [Member] | Other [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	16,549		2,125
Commercial [Member] | Other [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0		0
Commercial [Member] | Purchased Non-Covered Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	5,010	[1],[2]	8,421	[1],[2]
Commercial [Member] | Purchased Non-Covered Commercial [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	5,010	[2]	8,421	[2]
Commercial [Member] | Purchased Non-Covered Commercial [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0	[2]	0	[2]
Commercial Real-Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	3,864,118		3,514,261
Commercial Real-Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	3,814,145		3,447,753
Commercial Real-Estate [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	49,973		66,508
Commercial Real-Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	40,401		65,811
Commercial Real-Estate [Member] | Residential Construction [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	37,291		63,818
Commercial Real-Estate [Member] | Residential Construction [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	3,110		1,993
Commercial Real-Estate [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	170,955		169,876
Commercial Real-Estate [Member] | Commercial Construction [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	168,796		167,718
Commercial Real-Estate [Member] | Commercial Construction [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	2,159		2,158
Commercial Real-Estate [Member] | Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	134,197		178,531
Commercial Real-Estate [Member] | Land [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	122,898		146,984
Commercial Real-Estate [Member] | Land [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	11,299		31,547
Commercial Real-Estate [Member] | Office [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	569,711		554,446
Commercial Real-Estate [Member] | Office [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	565,515		543,832
Commercial Real-Estate [Member] | Office [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	4,196		10,614
Commercial Real-Estate [Member] | Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	577,937		555,802
Commercial Real-Estate [Member] | Industrial [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	575,848		553,800
Commercial Real-Estate [Member] | Industrial [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	2,089		2,002
Commercial Real-Estate [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	568,896		536,729
Commercial Real-Estate [Member] | Retail [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	561,104		531,363
Commercial Real-Estate [Member] | Retail [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	7,792		5,366
Commercial Real-Estate [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	396,691		314,557
Commercial Real-Estate [Member] | Multi-Family [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	394,105		309,821
Commercial Real-Estate [Member] | Multi-Family [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	2,586		4,736
Commercial Real-Estate [Member] | Mixed Use and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,349,254		1,086,654
Commercial Real-Estate [Member] | Mixed Use and Other [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,332,512		1,078,562
Commercial Real-Estate [Member] | Mixed Use and Other [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	16,742		8,092
Commercial Real-Estate [Member] | Purchased Non-Covered Commercial Real-Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	56,076	[1],[2]	51,855	[1],[2]
Commercial Real-Estate [Member] | Purchased Non-Covered Commercial Real-Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	56,076	[2]	51,855	[2]
Commercial Real-Estate [Member] | Purchased Non-Covered Commercial Real-Estate [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0	[2]	0	[2]
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	788,474		862,345
Home Equity [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	774,951		848,181
Home Equity [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	13,523		14,164
Residential Real-Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	366,357		349,596
Residential Real-Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	354,629		342,977
Residential Real-Estate [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	11,728		6,619
Residential Real-Estate [Member] | Purchased Non-Covered Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	856	[1],[2]	693	[1],[2]
Residential Real-Estate [Member] | Purchased Non-Covered Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	856	[2]	693	[2]
Residential Real-Estate [Member] | Purchased Non-Covered Residential Real Estate [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0	[2]	0	[2]
Premium Finance Receivable [Member] | Commercial Insurance Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,987,856		1,412,454
Premium Finance Receivable [Member] | Commercial Insurance Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,968,546		1,399,418
Premium Finance Receivable [Member] | Commercial Insurance Loans [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	19,310		13,036
Premium Finance Receivable [Member] | Life Insurance Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,210,707		1,096,762
Premium Finance Receivable [Member] | Life Insurance Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,210,682		1,096,708
Premium Finance Receivable [Member] | Life Insurance Loans [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	25		54
Premium Finance Receivable [Member] | Purchased Life Insurance Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	514,459	[1],[2]	598,463	[1],[2]
Premium Finance Receivable [Member] | Purchased Life Insurance Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	514,459	[2]	598,463	[2]
Premium Finance Receivable [Member] | Purchased Life Insurance Loans [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	0	[2]	0	[2]
Indirect Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	77,333		64,545
Indirect Consumer [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	77,089		64,093
Indirect Consumer [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	244		452
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	101,153		123,866
Consumer and Other [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	99,610		123,633
Consumer and Other [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	1,543		233
Consumer and Other [Member] | Purchased Non-Covered Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	2,832	[1],[2]	79	[2]
Consumer and Other [Member] | Purchased Non-Covered Consumer and Other [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	2,832	[2]	79	[2]
Consumer and Other [Member] | Purchased Non-Covered Consumer and Other [Member] | Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income, excluding covered loans	$ 0	[2]	$ 0	[2]

[1] Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. See Note 4 - Loans for further discussion of these purchased loans.

[2] Purchased loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 4 - Loans for further discussion of these purchased loans.