Loans And Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	$ 35,409		$ 42,023
60-89 Days Past Due and Accruing	13,786		32,093
90 Days Past Due and Accruing	4,540		1,257
Non-accrual	163,228		195,150
Total Past Due and Non-accrual	216,963		270,523
Current	12,519,246		11,793,533
Recorded investment in loans and leases	12,736,209	[1]	12,064,056	[1]
Residential 1-4 family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	11,721		16,955
60-89 Days Past Due and Accruing	6,476		8,250
90 Days Past Due and Accruing	0		0
Non-accrual	81,133		94,853
Total Past Due and Non-accrual	99,330		120,058
Current	3,226,077		3,142,220
Recorded investment in loans and leases	3,325,407		3,262,278
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	0		0
60-89 Days Past Due and Accruing	363		360
90 Days Past Due and Accruing	0		0
Non-accrual	387		823
Total Past Due and Non-accrual	750		1,183
Current	45,402		38,535
Recorded investment in loans and leases	46,152		39,718
Home equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	13,892		17,745
60-89 Days Past Due and Accruing	4,696		6,993
90 Days Past Due and Accruing	0		0
Non-accrual	45,517		49,516
Total Past Due and Non-accrual	64,105		74,254
Current	2,312,874		2,396,944
Recorded investment in loans and leases	2,376,979		2,471,198
Liquidating-home equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	1,440		2,063
60-89 Days Past Due and Accruing	424		1,626
90 Days Past Due and Accruing	0		0
Non-accrual	6,271		8,200
Total Past Due and Non-accrual	8,135		11,889
Current	98,079		111,760
Recorded investment in loans and leases	106,214		123,649
Other consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	462		338
60-89 Days Past Due and Accruing	193		195
90 Days Past Due and Accruing	0		0
Non-accrual	140		135
Total Past Due and Non-accrual	795		668
Current	60,543		43,446
Recorded investment in loans and leases	61,338		44,114
Commercial non-mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	3,208		2,248
60-89 Days Past Due and Accruing	984		552
90 Days Past Due and Accruing	4,305		347
Non-accrual	10,946		17,547
Total Past Due and Non-accrual	19,443		20,694
Current	2,712,870		2,386,775
Recorded investment in loans and leases	2,732,313		2,407,469
Asset-based [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	0		0
60-89 Days Past Due and Accruing	0		0
90 Days Past Due and Accruing	0		0
Non-accrual	0		0
Total Past Due and Non-accrual	0		0
Current	560,931		505,717
Recorded investment in loans and leases	560,931		505,717
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	4,387		1,081
60-89 Days Past Due and Accruing	587		13,784
90 Days Past Due and Accruing	235		910
Non-accrual	13,456		15,658
Total Past Due and Non-accrual	18,665		31,433
Current	2,842,637		2,617,213
Recorded investment in loans and leases	2,861,302		2,648,646
Commercial construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	0		0
60-89 Days Past Due and Accruing	0		0
90 Days Past Due and Accruing	0		0
Non-accrual	49		49
Total Past Due and Non-accrual	49		49
Current	183,313		114,097
Recorded investment in loans and leases	183,362		114,146
Residential development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	0		0
60-89 Days Past Due and Accruing	0		0
90 Days Past Due and Accruing	0		0
Non-accrual	4,188		5,044
Total Past Due and Non-accrual	4,188		5,044
Current	17,573		22,766
Recorded investment in loans and leases	21,761		27,810
Equipment financing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	299		1,593
60-89 Days Past Due and Accruing	63		333
90 Days Past Due and Accruing	0		0
Non-accrual	1,141		3,325
Total Past Due and Non-accrual	1,503		5,251
Current	458,947		414,060
Recorded investment in loans and leases	$ 460,450		$ 419,311

[1] Loans and leases include net deferred fees and unamortized premiums of $13.3 million and $12.7 million at December 31, 2013 and December 31, 2012, respectively.