Loans And Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	$ 30,557	$ 42,023
60-89 Days Past Due and Accruing	18,586	32,093
90 Days Past Due and Accruing	1,557	1,257
Non-accrual	186,953	195,150
Total Past Due	237,653	270,523
Current	12,045,328	11,793,533
Recorded investment	12,282,981	12,064,056
1-4 family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	10,779	16,955
60-89 Days Past Due and Accruing	5,511	8,250
90 Days Past Due and Accruing	0	0
Non-accrual	93,406	94,853
Total Past Due	109,696	120,058
Current	3,164,877	3,142,220
Recorded investment	3,274,573	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	0	360
90 Days Past Due and Accruing	0	0
Non-accrual	926	823
Total Past Due	926	1,183
Current	48,481	38,535
Recorded investment	49,407	39,718
Home equity loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	11,248	17,745
60-89 Days Past Due and Accruing	4,566	6,993
90 Days Past Due and Accruing	0	0
Non-accrual	44,718	49,516
Total Past Due	60,532	74,254
Current	2,341,508	2,396,944
Recorded investment	2,402,040	2,471,198
Liquidating portfolio-home equity loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	1,489	2,063
60-89 Days Past Due and Accruing	462	1,626
90 Days Past Due and Accruing	0	0
Non-accrual	7,636	8,200
Total Past Due	9,587	11,889
Current	103,837	111,760
Recorded investment	113,424	123,649
Other consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	310	338
60-89 Days Past Due and Accruing	119	195
90 Days Past Due and Accruing	0	0
Non-accrual	87	135
Total Past Due	516	668
Current	49,594	43,446
Recorded investment	50,110	44,114
Commercial non-mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	4,795	2,248
60-89 Days Past Due and Accruing	6,265	552
90 Days Past Due and Accruing	1,002	347
Non-accrual	17,266	17,547
Total Past Due	29,328	20,694
Current	2,495,248	2,386,775
Recorded investment	2,524,576	2,407,469
Asset-based loans [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	0	0
Current	593,646	505,717
Recorded investment	593,646	505,717
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	1,426	1,081
60-89 Days Past Due and Accruing	649	13,784
90 Days Past Due and Accruing	555	910
Non-accrual	16,568	15,658
Total Past Due	19,198	31,433
Current	2,681,289	2,617,213
Recorded investment	2,700,487	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	49	49
Current	147,192	114,097
Recorded investment	147,241	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	740	0
90 Days Past Due and Accruing	0	0
Non-accrual	4,445	5,044
Total Past Due	5,185	5,044
Current	21,634	22,766
Recorded investment	26,819	27,810
Equipment Financing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Accruing	510	1,593
60-89 Days Past Due and Accruing	274	333
90 Days Past Due and Accruing	0	0
Non-accrual	1,852	3,325
Total Past Due	2,636	5,251
Current	398,022	414,060
Recorded investment	$ 400,658	$ 419,311