Loans And Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	$ 29,709		$ 35,409
60-89 Days Past Due and Accruing	15,009		13,786
90 Days Past Due and Accruing	1,283		4,540
Non-accrual	140,080		163,228
Total Past Due and Non-accrual	186,081		216,963
Current	13,366,072		12,519,246
Total Loans and Leases	13,552,153	[1]	12,736,209	[1]
Total recorded investment of TDRs	323,131		341,898
1-4 family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	9,906	[2]	11,721
60-89 Days Past Due and Accruing	6,295	[2]	6,839
90 Days Past Due and Accruing	0	[2]	0
Non-accrual	68,402	[2]	81,520
Total Past Due and Non-accrual	84,603	[2]	100,080
Current	3,381,199	[2]	3,271,479
Total Loans and Leases	3,465,802	[2]	3,371,559
Home equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	9,498	[2]	15,332
60-89 Days Past Due and Accruing	7,068	[2]	5,120
90 Days Past Due and Accruing	0	[2]	0
Non-accrual	38,959	[2]	51,788
Total Past Due and Non-accrual	55,525	[2]	72,240
Current	2,429,571	[2]	2,410,953
Total Loans and Leases	2,485,096	[2]	2,483,193
Other consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	671		462
60-89 Days Past Due and Accruing	334		193
90 Days Past Due and Accruing	0		0
Non-accrual	244		140
Total Past Due and Non-accrual	1,249		795
Current	103,663		60,543
Total Loans and Leases	104,912		61,338
Commercial non-mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	8,402		3,208
60-89 Days Past Due and Accruing	450		984
90 Days Past Due and Accruing	795		4,305
Non-accrual	12,454		10,946
Total Past Due and Non-accrual	22,101		19,443
Current	2,972,897		2,712,870
Total Loans and Leases	2,994,998		2,732,313
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	648,737		560,931
Total Loans and Leases	648,737		560,931
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	991		4,387
60-89 Days Past Due and Accruing	670		587
90 Days Past Due and Accruing	488		235
Non-accrual	14,443		13,456
Total Past Due and Non-accrual	16,592		18,665
Current	3,131,467		2,842,637
Total Loans and Leases	3,148,059		2,861,302
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	3,919		4,237
Total Past Due and Non-accrual	3,919		4,237
Current	210,480		200,886
Total Loans and Leases	214,399		205,123
Finance Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	241		299
60-89 Days Past Due and Accruing	192		63
90 Days Past Due and Accruing	0		0
Non-accrual	1,659		1,141
Total Past Due and Non-accrual	2,092		1,503
Current	488,058		458,947
Total Loans and Leases	490,150		460,450
Residential TDR CH 7 Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total recorded investment of TDRs	$ 17,600

[1] Loans and leases include net deferred fees and unamortized premiums of $14.5 million and $13.3 million at September 30, 2014 and December 31, 2013, respectively.

[2] A total of $17.6 million residential and consumer loans was reclassified from non-accrual to accrual status as a result of updated regulatory guidance issued in the first quarter of 2014.