Loans And Leases (Impaired Loans And Leases By Class) (Detail) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 467,005,000		$ 544,854,000
Impaired Financing Receivable, Recorded Investment	414,292,000		495,276,000
Impaired Financing Receivable, Related Allowance	27,449,000		46,605,000
Impaired Financing Receivable, Unpaid Principal Balance, Discharged in Bankruptcy	24,400,000		27,600,000
1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	149,567,000	[1]	133,123,000
Impaired Financing Receivable, Recorded Investment	136,670,000	[1]	124,461,000
Impaired Financing Receivable, Related Allowance	13,015,000	[1]	16,611,000
Permanent-NCLC [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	10,923,000	[1]	12,005,000
Impaired Financing Receivable, Recorded Investment	10,013,000	[1]	10,718,000
Impaired Financing Receivable, Related Allowance	1,711,000	[1]	2,747,000
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	446,000	[1]	129,000
Impaired Financing Receivable, Recorded Investment	261,000	[1]	132,000
Impaired Financing Receivable, Related Allowance	5,000	[1]	9,000
Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	56,815,000	[1]	35,285,000
Impaired Financing Receivable, Recorded Investment	47,755,000	[1]	31,153,000
Impaired Financing Receivable, Related Allowance	2,960,000	[1]	4,116,000
Liquidating Portfolio-Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	11,788,000	[1]	7,277,000
Impaired Financing Receivable, Recorded Investment	7,038,000	[1]	5,469,000
Impaired Financing Receivable, Related Allowance	651,000	[1]	1,050,000
Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	0	[1]	7,000
Impaired Financing Receivable, Recorded Investment	0	[1]	7,000
Impaired Financing Receivable, Related Allowance	0	[1]	1,000
Commercial Non-Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	90,627,000		118,293,000
Impaired Financing Receivable, Recorded Investment	69,426,000		105,359,000
Impaired Financing Receivable, Related Allowance	6,423,000		12,996,000
Asset-Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	0		7,814,000
Impaired Financing Receivable, Recorded Investment	0		1,859,000
Impaired Financing Receivable, Related Allowance	0		0
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	123,861,000		195,838,000
Impaired Financing Receivable, Recorded Investment	121,193,000		189,575,000
Impaired Financing Receivable, Related Allowance	2,572,000		8,514,000
Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	7,177,000		7,347,000
Impaired Financing Receivable, Recorded Investment	7,185,000		7,373,000
Impaired Financing Receivable, Related Allowance	0		557,000
Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	13,444,000		16,495,000
Impaired Financing Receivable, Recorded Investment	12,771,000		15,902,000
Impaired Financing Receivable, Related Allowance	111,000		0
Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	2,357,000		11,241,000
Impaired Financing Receivable, Recorded Investment	1,980,000		3,268,000
Impaired Financing Receivable, Related Allowance	1,000		4,000
Total Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	160,936,000		145,257,000
Impaired Financing Receivable, Recorded Investment	146,944,000		135,311,000
Impaired Financing Receivable, Related Allowance	14,731,000		19,367,000
Total Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	68,603,000		42,569,000
Impaired Financing Receivable, Recorded Investment	54,793,000		36,629,000
Impaired Financing Receivable, Related Allowance	3,611,000		5,167,000
Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	90,627,000		126,107,000
Impaired Financing Receivable, Recorded Investment	69,426,000		107,218,000
Impaired Financing Receivable, Related Allowance	6,423,000		12,996,000
Total Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	144,482,000		219,680,000
Impaired Financing Receivable, Recorded Investment	141,149,000		212,850,000
Impaired Financing Receivable, Related Allowance	2,683,000		9,071,000
Total Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	2,357,000		11,241,000
Impaired Financing Receivable, Recorded Investment	1,980,000		3,268,000
Impaired Financing Receivable, Related Allowance	1,000		4,000
Recorded Investment No Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	153,202,000		156,344,000
Recorded Investment No Allowance [Member] | 1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	22,225,000	[1]	0
Recorded Investment No Allowance [Member] | Permanent-NCLC [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,042,000	[1]	0
Recorded Investment No Allowance [Member] | Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	156,000	[1]	0
Recorded Investment No Allowance [Member] | Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	23,967,000	[1]	4,000
Recorded Investment No Allowance [Member] | Liquidating Portfolio-Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	3,663,000	[1]	3,000
Recorded Investment No Allowance [Member] | Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	[1]	0
Recorded Investment No Allowance [Member] | Commercial Non-Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	21,942,000		30,207,000
Recorded Investment No Allowance [Member] | Asset-Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0		1,859,000
Recorded Investment No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	65,212,000		105,618,000
Recorded Investment No Allowance [Member] | Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,185,000		0
Recorded Investment No Allowance [Member] | Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	5,029,000		15,902,000
Recorded Investment No Allowance [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	1,781,000		2,751,000
Recorded Investment No Allowance [Member] | Total Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	24,423,000		0
Recorded Investment No Allowance [Member] | Total Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	27,630,000		7,000
Recorded Investment No Allowance [Member] | Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	21,942,000		32,066,000
Recorded Investment No Allowance [Member] | Total Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	77,426,000		121,520,000
Recorded Investment No Allowance [Member] | Total Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	1,781,000		2,751,000
Recorded Investment With Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	261,090,000		338,932,000
Recorded Investment With Allowance [Member] | 1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	114,445,000	[1]	124,461,000
Recorded Investment With Allowance [Member] | Permanent-NCLC [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,971,000	[1]	10,718,000
Recorded Investment With Allowance [Member] | Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	105,000	[1]	132,000
Recorded Investment With Allowance [Member] | Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	23,788,000	[1]	31,149,000
Recorded Investment With Allowance [Member] | Liquidating Portfolio-Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	3,375,000	[1]	5,466,000
Recorded Investment With Allowance [Member] | Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	[1]	7,000
Recorded Investment With Allowance [Member] | Commercial Non-Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	47,484,000		75,152,000
Recorded Investment With Allowance [Member] | Asset-Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0		0
Recorded Investment With Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	55,981,000		83,957,000
Recorded Investment With Allowance [Member] | Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0		7,373,000
Recorded Investment With Allowance [Member] | Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,742,000		0
Recorded Investment With Allowance [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	199,000		517,000
Recorded Investment With Allowance [Member] | Total Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	122,521,000		135,311,000
Recorded Investment With Allowance [Member] | Total Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	27,163,000		36,622,000
Recorded Investment With Allowance [Member] | Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	47,484,000		75,152,000
Recorded Investment With Allowance [Member] | Total Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	63,723,000		91,330,000
Recorded Investment With Allowance [Member] | Total Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 199,000		$ 517,000

[1] The increase in Residential and Consumer impaired loans for the year ended December 31, 2012 as compared to the year ended December 31, 2011 is due to the Company recording of $24.4 million residential loans and $27.6 million of consumer loans, respectively, where the borrower’s obligation has been discharged in bankruptcy which are reported in accordance with a recent regulatory interpretation of GAAP which requires loans discharged under Chapter 7 bankruptcy and not reaffirmed by the borrower to be considered TDRs and thus impaired, regardless of their delinquency status.