Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Impaired Loans Eval For Impairment) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended				12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$ 91,511	[1]	$ 96,519	[1]	$ 92,184	[1]
Related Allowance	10,298		11,839		8,265
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	45,734		93,629		70,045
Recorded Investment	137,245	[2]	190,148	[2]	162,229	[2]
Unpaid Principal Balance	164,281		223,196		195,455
Average Recorded Investment	142,960		194,249		170,658
Impaired Financing Receivable, Interest Income, Accrual Method	3,790		5,044		8,920
Home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,562		3,454		3,985
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,616		4,857		5,238
Related Allowance	636		1,060		1,593
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,567		4,183		4,855
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	30		87		236
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,468		10,034		6,312
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,553		11,734		7,790
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	138		235		324
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,842		10,012		6,307
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,997		3,155		6,876
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,372		3,666		7,023
Related Allowance	457		575		626
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,914		2,905		6,335
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	140		62		273
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	12,422		10,207		10,761
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	15,538		10,860		13,585
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	295		211		393
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	12,836		10,632		9,443
Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	304		646		267
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	364		648		269
Related Allowance	102		218		109
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	308		650		273
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	8		17		11
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,256		1,192		1,322
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,775		1,736		1,865
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	53		52		115
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,260		1,221		1,355
Commercial and industrial | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,220		11,720		6,297
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	10,152		13,429		7,001
Related Allowance	1,631		4,561		1,078
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	8,332		12,131		6,611
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	339		434		354
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,222		11,028		9,890
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,666		14,384		16,333
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	219		393		1,043
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,591		12,155		13,928
Franchise [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Mortgage Warehouse Line of Credit [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Community Advanatage Homeowners Association [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Aircraft Loan [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Asset Based Lending [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	270		1,803		282
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	290		1,810		294
Related Allowance	270		988		282
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	275		1,721		295
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	7		46		14
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	25		12		354
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,952		1,352		2,311
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	50		36		121
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	150		19		2,162
Tax Exempt [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Leases [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Other Receivables [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Residential Construction [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		1,528		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		1,615		0
Related Allowance	0		403		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		1,547		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		33		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		4,100		1,463
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		4,481		1,530
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		81		64
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		3,782		1,609
Commercial Real Estate Construction Financing Receivable [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,146		10,591		3,099
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,156		10,591		3,099
Related Allowance	128		67		18
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,150		10,853		3,098
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	44		207		115
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,031		8,377		7,710
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,031		13,410		13,227
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	23		357		722
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,051		11,508		9,680
Land Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	11,687		8,713		10,518
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	15,538		8,894		11,871
Related Allowance	363		173		259
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	11,876		7,281		10,323
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	378		117		411
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,917		8,195		5,035
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,958		13,910		8,813
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	131		331		418
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,657		9,791		5,384
Office Building Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	14,403		9,306		7,792
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	15,159		9,411		8,444
Related Allowance	2,664		685		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	14,517		9,385		8,148
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	335		170		333
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,598		7,442		10,379
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,599		9,171		11,717
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	73		237		610
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,605		8,581		10,925
Industrial Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,349		4,165		3,385
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,455		5,226		3,506
Related Allowance	227		203		193
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,372		5,047		3,638
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	76		159		179
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,603		5,178		5,087
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,839		5,321		5,267
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	95		141		328
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,155		5,234		5,160
Retail Loan [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	14,320		12,730		17,511
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	14,733		12,730		17,638
Related Allowance	1,590		152		1,253
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	14,343		12,675		17,678
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	304		254		724
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	6,422		16,114		7,047
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,813		17,374		8,610
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	188		406		400
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,456		15,512		8,462
Multi Family [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,835		4,712		3,237
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,349		5,173		3,730
Related Allowance	119		1,068		235
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,857		4,824		2,248
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	73		112		139
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	440		894		608
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	966		3,009		1,030
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	22		74		47
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	497		1,235		903
Mixed Use And Other [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	27,418		23,996		28,935
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	27,565		24,940		29,051
Related Allowance	2,111		1,686		1,366
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	28,474		21,742		26,792
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	551		499		1,194
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,330		10,856		4,077
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	7,842		13,464		6,213
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	218		293		352
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,875		9,623		5,046
Commercial Insurance Loans [Member] | Premium finance receivables
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Life Insurance Loans [Member] | Premium finance receivables
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		0		0
Purchased Life Insurance Loans [Member] | Premium finance receivables
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0		0		0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	$ 0		$ 0		$ 0

[1] 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.

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