Allowance For Loan Losses, Allowance For Losses On Lending-Related Commitments And Impaired Loans (Summary Of Impaired Loans Evaluated For Impairment By Loan Class) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended				12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Recorded Investment	$ 233,014	[1]	$ 203,570	[1]	$ 226,538	[1]
Unpaid Principal Balance	256,725		228,576		251,230
Related Allowance	19,818		28,447		21,488
Average Recorded Investment	247,500		218,367		247,054
Interest Income Recognized	9,301		8,892		12,470
Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	120,060	[2]	83,191	[2]	115,779	[2]
Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	112,954		120,379		110,759
Commercial Portfolio Segment [Member] | Commercial And Industrial [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	11,271		9,542		7,743
Unpaid Principal Balance	13,484		10,725		9,083
Related Allowance	2,615		6,597		2,506
Average Recorded Investment	13,623		9,670		9,113
Interest Income Recognized	670		398		510
Commercial Portfolio Segment [Member] | Commercial And Industrial [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	25,019		19,238		17,680
Unpaid Principal Balance	28,581		24,131		20,365
Related Allowance	0		0		0
Average Recorded Investment	27,829		25,522		21,841
Interest Income Recognized	1,076		1,032		1,068
Commercial Portfolio Segment [Member] | Franchise [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	1,792		0		1,792
Unpaid Principal Balance	1,792		0		1,792
Related Allowance	386		0		394
Average Recorded Investment	1,792		0		1,792
Interest Income Recognized	91		0		122
Commercial Portfolio Segment [Member] | Franchise [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		1,792		0
Unpaid Principal Balance	0		1,792		0
Related Allowance	0		0		0
Average Recorded Investment	0		1,792		0
Interest Income Recognized	0		92		0
Commercial Portfolio Segment [Member] | Warehouse Agreement Borrowings [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Warehouse Agreement Borrowings [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Community Advantage - Homeowners Association [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Community Advantage - Homeowners Association [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Aircraft [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	428		0		0
Unpaid Principal Balance	428		0		0
Related Allowance	95		0		0
Average Recorded Investment	428		0		0
Interest Income Recognized	22		0		0
Commercial Portfolio Segment [Member] | Aircraft [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Asset-Based Lending [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	306		945		785
Unpaid Principal Balance	1,624		1,451		1,452
Related Allowance	72		501		178
Average Recorded Investment	558		1,485		1,360
Interest Income Recognized	67		62		81
Commercial Portfolio Segment [Member] | Asset-Based Lending [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	22		1,044		287
Unpaid Principal Balance	57		1,044		287
Related Allowance	0		0		0
Average Recorded Investment	81		1,089		483
Interest Income Recognized	5		44		25
Commercial Portfolio Segment [Member] | Municipal Receivables [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Municipal Receivables [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Leases [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Leases [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Other Receivables [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Portfolio Segment [Member] | Other Receivables [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Commercial Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	2,637		716		1,993
Unpaid Principal Balance	2,712		716		2,068
Related Allowance	540		160		374
Average Recorded Investment	2,637		716		1,993
Interest Income Recognized	102		33		122
Commercial Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	3,603		3,298		4,284
Unpaid Principal Balance	3,719		4,017		4,338
Related Allowance	0		0		0
Average Recorded Investment	4,389		4,180		4,189
Interest Income Recognized	134		141		175
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	4,184		2,483		3,779
Unpaid Principal Balance	4,184		2,613		3,779
Related Allowance	743		381		952
Average Recorded Investment	4,160		2,606		3,802
Interest Income Recognized	153		117		187
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Construction Financing Receivable [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	9,868		11,019		9,792
Unpaid Principal Balance	10,466		11,019		9,792
Related Allowance	0		0		0
Average Recorded Investment	10,937		11,330		10,249
Interest Income Recognized	332		377		426
Commercial Real Estate Portfolio Segment [Member] | Land [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	13,689		25,990		27,657
Unpaid Principal Balance	15,459		27,782		29,602
Related Allowance	1,576		7,396		6,253
Average Recorded Investment	13,986		26,591		29,085
Interest Income Recognized	460		1,121		1,528
Commercial Real Estate Portfolio Segment [Member] | Land [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	13,330		11,442		15,991
Unpaid Principal Balance	17,331		20,681		23,097
Related Allowance	0		0		0
Average Recorded Investment	15,866		13,267		19,139
Interest Income Recognized	648		899		1,348
Commercial Real Estate Portfolio Segment [Member] | Office [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	7,366		12,627		11,673
Unpaid Principal Balance	9,851		12,822		13,110
Related Allowance	802		4,985		2,873
Average Recorded Investment	7,998		12,656		13,209
Interest Income Recognized	355		564		709
Commercial Real Estate Portfolio Segment [Member] | Office [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	9,463		8,411		9,162
Unpaid Principal Balance	10,368		9,702		11,421
Related Allowance	0		0		0
Average Recorded Investment	9,627		9,653		11,235
Interest Income Recognized	339		378		550
Commercial Real Estate Portfolio Segment [Member] | Industrial Property [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	752		1,057		663
Unpaid Principal Balance	804		1,059		676
Related Allowance	295		257		159
Average Recorded Investment	778		1,063		676
Interest Income Recognized	34		52		46
Commercial Real Estate Portfolio Segment [Member] | Industrial Property [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	3,080		7,037		4,569
Unpaid Principal Balance	3,164		7,527		4,780
Related Allowance	0		0		0
Average Recorded Investment	3,115		7,338		4,750
Interest Income Recognized	107		274		198
Commercial Real Estate Portfolio Segment [Member] | Retail Site [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	17,933		2,157		13,728
Unpaid Principal Balance	18,060		2,661		13,732
Related Allowance	1,257		566		480
Average Recorded Investment	18,024		2,147		13,300
Interest Income Recognized	626		110		504
Commercial Real Estate Portfolio Segment [Member] | Retail Site [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	16,610		13,197		15,841
Unpaid Principal Balance	16,876		13,200		15,845
Related Allowance	0		0		0
Average Recorded Investment	17,070		13,209		15,846
Interest Income Recognized	613		485		815
Commercial Real Estate Portfolio Segment [Member] | Multi Family [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	5,588		3,423		7,149
Unpaid Principal Balance	5,588		3,766		7,155
Related Allowance	859		1,150		1,892
Average Recorded Investment	5,598		3,661		7,216
Interest Income Recognized	213		134		330
Commercial Real Estate Portfolio Segment [Member] | Multi Family [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	1,926		548		2,347
Unpaid Principal Balance	2,672		548		3,040
Related Allowance	0		0		0
Average Recorded Investment	2,371		549		3,026
Interest Income Recognized	87		14		127
Commercial Real Estate Portfolio Segment [Member] | Mixed Use And Other [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	30,921		6,790		20,386
Unpaid Principal Balance	32,005		7,087		21,337
Related Allowance	3,842		2,237		1,447
Average Recorded Investment	31,582		7,687		21,675
Interest Income Recognized	1,145		307		1,027
Commercial Real Estate Portfolio Segment [Member] | Mixed Use And Other [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	19,761		33,780		22,359
Unpaid Principal Balance	21,819		35,512		25,015
Related Allowance	0		0		0
Average Recorded Investment	20,970		34,601		24,370
Interest Income Recognized	861		1,289		1,297
Home Equity [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	8,254		12,254		11,828
Unpaid Principal Balance	8,923		12,718		12,600
Related Allowance	3,011		2,272		2,963
Average Recorded Investment	8,572		12,469		12,318
Interest Income Recognized	352		494		652
Home Equity [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	4,864		4,113		3,950
Unpaid Principal Balance	5,494		4,497		4,707
Related Allowance	0		0		0
Average Recorded Investment	4,931		4,775		4,784
Interest Income Recognized	162		135		184
Residential Real-Estate [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	13,578		4,630		6,478
Unpaid Principal Balance	14,220		4,785		6,681
Related Allowance	3,244		1,509		992
Average Recorded Investment	13,507		4,622		6,535
Interest Income Recognized	448		109		220
Residential Real-Estate [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	5,118		5,199		4,314
Unpaid Principal Balance	5,374		5,870		5,153
Related Allowance	0		0		0
Average Recorded Investment	5,392		4,756		4,734
Interest Income Recognized	118		189		191
Premium Finance Receivable [Member] | Purchased Life Insurance Loans [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Premium Finance Receivable [Member] | Purchased Life Insurance Loans [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Premium Finance Receivable [Member] | Life Insurance Loans [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Premium Finance Receivable [Member] | Life Insurance Loans [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Premium Finance Receivable [Member] | Commercial Insurance Loans [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Premium Finance Receivable [Member] | Commercial Insurance Loans [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0		0		0
Interest Income Recognized	0		0		0
Indirect Consumer [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	12		49		31
Unpaid Principal Balance	13		51		32
Related Allowance	1		7		5
Average Recorded Investment	13		52		33
Interest Income Recognized	1		3		3
Indirect Consumer [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	57		32		44
Unpaid Principal Balance	71		40		55
Related Allowance	0		0		0
Average Recorded Investment	67		39		56
Interest Income Recognized	5		3		6
Consumer And Other [Member] | Impaired Loans With A Related ASC 310 Allowance Recorded [Member]
Recorded Investment	1,349		528		94
Unpaid Principal Balance	1,349		529		95
Related Allowance	480		429		20
Average Recorded Investment	1,351		608		99
Interest Income Recognized	64		26		7
Consumer And Other [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Recorded Investment	233		229		139
Unpaid Principal Balance	237		231		141
Related Allowance	0		0		0
Average Recorded Investment	248		234		146
Interest Income Recognized	$ 11		$ 10		$ 12

[1] Impaired loans are considered by the Company to be non-accrual loans, restructured loans or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.

[2] These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans.