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 (Schedule Of Aging) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 84,034		$ 103,582		$ 113,979
90+ days and still accruing	63,914		86,484		115,172
60-89 days past due	34,580		39,698		53,401
30-59 days past due	87,278		84,566		77,581
Current	13,755,344		12,928,703		12,611,361
Loans, net of unearned income, excluding covered loans	13,749,996		12,896,602		12,516,892
Nonaccrual	77,344		94,157		109,997
90+ days and still accruing	29,428		30,202		18,172
60-89 days past due	30,577		33,821		42,833
30-59 days past due	85,796		76,629		72,729
Current	13,526,851		12,661,793		12,273,161
Covered loans, Nonaccrual	6,690		9,425		3,982
Covered loans, 90 plus days and still accruing	34,486		56,282		97,000
Covered loans, 60-89 days past due	4,003		5,877		10,568
Covered loans, 30-59 days past due	1,482		7,937		4,852
Covered loans, Current	228,493		266,910		338,200
Covered loans	275,154		346,431		454,602
Total loans	14,025,150		13,243,033		12,971,494
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	6,511		10,780		17,248
90+ days and still accruing	1,452		274		290
60-89 days past due	4,165		5,882		5,245
30-59 days past due	30,146		11,755		19,142
Current	3,598,156		3,224,996		3,078,006
Loans, net of unearned income, excluding covered loans	3,640,430		3,253,687		3,119,931
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	36,321		46,658		54,825
90+ days and still accruing	15,991		18,812		9,729
60-89 days past due	9,629		15,394		18,561
30-59 days past due	30,293		29,870		33,700
Current	4,261,238		4,119,301		3,977,813
Loans, net of unearned income, excluding covered loans	4,353,472		4,230,035		4,094,628
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	5,804		10,071		12,322
90+ days and still accruing	0		0		25
60-89 days past due	1,392		1,344		2,085
30-59 days past due	3,324		3,060		5,821
Current	703,122		704,662		738,007
Loans, net of unearned income, excluding covered loans	713,642		719,137		758,260
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income, excluding covered loans	451,905		434,992		384,961
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of unearned income, excluding covered loans	160,373		167,488		172,231
Commercial and industrial | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	6,216		10,143		15,432
90+ days and still accruing	0		0		0
60-89 days past due	4,165		4,938		2,940
30-59 days past due	21,610		7,404		12,111
Current	1,980,489		1,813,721		1,665,753
Loans, net of unearned income, excluding covered loans	2,012,480		1,836,206		1,696,236
Franchise [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		400		0
30-59 days past due	549		0		450
Current	222,907		219,983		201,790
Loans, net of unearned income, excluding covered loans	223,456		220,383		202,240
Mortgage Warehouse Line of Credit [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	1,680		0		0
Current	146,531		67,470		174,422
Loans, net of unearned income, excluding covered loans	148,211		67,470		174,422
Community Advanatage Homeowners Association [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		0		0
Current	94,009		90,894		83,003
Loans, net of unearned income, excluding covered loans	94,009		90,894		83,003
Aircraft Loan [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		0		0
Current	7,847		10,241		13,174
Loans, net of unearned income, excluding covered loans	7,847		10,241		13,174
Asset Based Lending [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	295		637		1,816
90+ days and still accruing	0		0		100
60-89 days past due	0		388		2,305
30-59 days past due	6,047		1,878		4,949
Current	772,002		732,190		676,531
Loans, net of unearned income, excluding covered loans	778,344		735,093		685,701
Tax Exempt [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		0		0
Current	208,913		161,239		151,492
Loans, net of unearned income, excluding covered loans	208,913		161,239		151,492
Leases [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	36		788		0
Current	144,399		109,043		102,409
Loans, net of unearned income, excluding covered loans	144,435		109,831		102,409
Other Receivables [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0		0		0
90+ days and still accruing	0		0		0
60-89 days past due	0		0		0
30-59 days past due	0		0		0
Current	9,792		11,147		98
Loans, net of unearned income, excluding covered loans	9,792		11,147		98
Purchased Non Covered Commercial [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	1,452	[1]	274	[1]	190	[1]
60-89 days past due	0	[1]	156	[1]	0	[1]
30-59 days past due	224	[1]	1,685	[1]	1,632	[1]
Current	11,267	[1]	9,068	[1]	9,334	[1]
Loans, net of unearned income, excluding covered loans	12,943	[1],[2]	11,183	[1],[2]	11,156	[1],[2]
Residential Construction [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0		149		2,659
90+ days and still accruing	0		0		3,263
60-89 days past due	0		0		379
30-59 days past due	18		0		0
Current	29,941		38,351		32,998
Loans, net of unearned income, excluding covered loans	29,959		38,500		39,299
Commercial Real Estate Construction Financing Receivable [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	839		6,969		7,857
90+ days and still accruing	0		0		0
60-89 days past due	0		0		1,271
30-59 days past due	0		505		70
Current	154,220		129,232		128,845
Loans, net of unearned income, excluding covered loans	155,059		136,706		138,043
Land Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,367		2,814		5,742
90+ days and still accruing	0		0		0
60-89 days past due	614		4,224		330
30-59 days past due	4,502		619		4,141
Current	98,444		99,128		106,640
Loans, net of unearned income, excluding covered loans	105,927		106,785		116,853
Office Building Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	10,950		10,087		6,324
90+ days and still accruing	0		0		0
60-89 days past due	999		2,265		4,210
30-59 days past due	3,911		3,862		2,720
Current	652,057		626,027		584,503
Loans, net of unearned income, excluding covered loans	667,917		642,241		597,757
Industrial Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	5,097		5,654		5,773
90+ days and still accruing	0		0		0
60-89 days past due	899		585		4,597
30-59 days past due	690		914		4,984
Current	610,954		626,785		600,147
Loans, net of unearned income, excluding covered loans	617,640		633,938		615,501
Retail Loan [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	6,909		10,862		7,471
90+ days and still accruing	0		0		0
60-89 days past due	1,334		837		1,760
30-59 days past due	2,560		2,435		2,031
Current	686,292		642,125		596,129
Loans, net of unearned income, excluding covered loans	697,095		656,259		607,391
Multi Family [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	689		2,035		3,337
90+ days and still accruing	0		0		0
60-89 days past due	244		0		401
30-59 days past due	4,717		348		3,149
Current	630,519		564,154		526,681
Loans, net of unearned income, excluding covered loans	636,169		566,537		533,568
Mixed Use And Other [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	9,470		8,088		15,662
90+ days and still accruing	309		230		0
60-89 days past due	5,384		3,943		2,183
30-59 days past due	12,300		15,949		10,379
Current	1,350,976		1,344,244		1,350,581
Loans, net of unearned income, excluding covered loans	1,378,439		1,372,454		1,378,805
Purchased Non Covered Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	15,682	[1]	18,582	[1]	6,466	[1]
60-89 days past due	155	[1]	3,540	[1]	3,430	[1]
30-59 days past due	1,595	[1]	5,238	[1]	6,226	[1]
Current	47,835	[1]	49,255	[1]	51,289	[1]
Loans, net of unearned income, excluding covered loans	65,267	[1],[2]	76,615	[1],[2]	67,411	[1],[2]
Residential Real Estate Loan [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	15,294		14,974		10,213
90+ days and still accruing	0		0		0
60-89 days past due	1,487		1,689		1,896
30-59 days past due	1,978		5,032		1,836
Current	430,364		410,430		368,696
Loans, net of unearned income, excluding covered loans	449,123		432,125		382,641
Purchased Non Covered Residential Real Estate [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	988	[1]	1,988	[1]	0	[1]
60-89 days past due	111	[1]	0	[1]	46	[1]
30-59 days past due	0	[1]	0	[1]	260	[1]
Current	1,683	[1]	879	[1]	2,014	[1]
Loans, net of unearned income, excluding covered loans	2,782	[1],[2]	2,867	[1],[2]	2,320	[1],[2]
Commercial Insurance Loans [Member] | Premium finance receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	12,298		10,537		13,605
90+ days and still accruing	10,275		8,842		6,671
60-89 days past due	12,335		6,912		6,592
30-59 days past due	14,672		24,094		11,386
Current	2,328,949		2,117,180		2,127,480
Loans, net of unearned income, excluding covered loans	2,378,529		2,167,565		2,165,734
Life Insurance Loans [Member] | Premium finance receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0		0		16
90+ days and still accruing	649		0		1,212
60-89 days past due	896		2,524		7,896
30-59 days past due	4,783		1,808		0
Current	1,635,557		1,495,460		1,337,573
Loans, net of unearned income, excluding covered loans	1,641,885		1,499,792		1,346,697
Purchased Life Insurance Loans [Member] | Premium finance receivables
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	0	[1]	0	[1]	0	[1]
60-89 days past due	0	[1]	0	[1]	0	[1]
30-59 days past due	0	[1]	0	[1]	0	[1]
Current	409,760	[1]	423,906	[1]	474,450	[1]
Loans, net of unearned income, excluding covered loans	409,760	[1],[2]	423,906	[1],[2]	474,450	[1],[2]
Consumer and other | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,116		1,137		1,768
90+ days and still accruing	73		105		217
60-89 days past due	558		76		512
30-59 days past due	600		1,010		584
Current	157,828		163,956		168,812
Loans, net of unearned income, excluding covered loans	160,175		166,284		171,893
Purchased Non Covered Consumer And Other [Member] | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	[1]	0	[1]	0	[1]
90+ days and still accruing	0	[1]	181	[1]	28	[1]
60-89 days past due	4	[1]	0	[1]	0	[1]
30-59 days past due	0	[1]	0	[1]	0	[1]
Current	194	[1]	1,023	[1]	310	[1]
Loans, net of unearned income, excluding covered loans	$ 198	[1],[2]	$ 1,204	[1],[2]	$ 338	[1],[2]

[1] PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments.

[2] PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments.As of June 30, 2013 90+ days and still accruing 60-89 days past due 30-59 days past due (Dollars in thousands)Nonaccrual Current Total LoansLoan Balances: Commercial Commercial and industrial$15,432 $— $2,940 $12,111 $1,665,753 $1,696,236Franchise— — — 450 201,790 202,240Mortgage warehouse lines of credit— — — — 174,422 174,422Community Advantage—homeowners association— — — — 83,003 83,003Aircraft— — — — 13,174 13,174Asset-based lending1,816 100 2,305 4,949 676,531 685,701Tax exempt — — — — 151,492 151,492Leases— — — — 102,409 102,409Other— — — — 98 98PCI - commercial (1)— 190 — 1,632 9,334 11,156Total commercial17,248 290 5,245 19,142 3,078,006 3,119,931Commercial real-estate: Residential construction2,659 3,263 379 — 32,998 39,299Commercial construction7,857 — 1,271 70 128,845 138,043Land5,742 — 330 4,141 106,640 116,853Office6,324 — 4,210 2,720 584,503 597,757Industrial5,773 — 4,597 4,984 600,147 615,501Retail7,471 — 1,760 2,031 596,129 607,391Multi-family3,337 — 401 3,149 526,681 533,568Mixed use and other15,662 — 2,183 10,379 1,350,581 1,378,805PCI - commercial real-estate (1)— 6,466 3,430 6,226 51,289 67,411Total commercial real-estate54,825 9,729 18,561 33,700 3,977,813 4,094,628Home equity12,322 25 2,085 5,821 738,007 758,260Residential real estate10,213 — 1,896 1,836 368,696 382,641PCI - residential real estate (1)— — 46 260 2,014 2,320Premium finance receivables Commercial insurance loans13,605 6,671 6,592 11,386 2,127,480 2,165,734Life insurance loans16 1,212 7,896 — 1,337,573 1,346,697PCI - life insurance loans (1)— — — — 474,450 474,450Consumer and other1,768 217 512 584 168,812 171,893PCI - consumer and other (1)— 28 — — 310 338Total loans, net of unearned income, excluding covered loans$109,997 $18,172 $42,833 $72,729 $12,273,161 $12,516,892Covered loans3,982 97,000 10,568 4,852 338,200 454,602Total loans, net of unearned income$113,979 $115,172 $53,401 $77,581 $12,611,361 $12,971,494(1)PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments.Our ability to manage credit risk depends in large part on our ability to properly identify and manage problem loans. To do so, we operate a credit risk rating system under which our credit management personnel assign a credit risk rating (1 to 10 rating) to each loan at the time of origination and review loans on a regular basis.Each loan officer is responsible for monitoring his or her loan portfolio, recommending a credit risk rating for each loan in his or her portfolio and ensuring the credit risk ratings are appropriate. These credit risk ratings are then ratified by the bank’s chief credit officer and/or concurrence credit officer. Credit risk ratings are determined by evaluating a number of factors including: a borrower’s financial strength, cash flow coverage, collateral protection and guarantees.The Company’s Problem Loan Reporting system automatically includes all loans with credit risk ratings of 6 through 9. This system is designed to provide an on-going detailed tracking mechanism for each problem loan. Once management determines that a loan has deteriorated to a point where it has a credit risk rating of 6 or worse, the Company’s Managed Asset Division performs an overall credit and collateral review. As part of this review, all underlying collateral is identified and the valuation methodology is analyzed and tracked. As a result of this initial review by the Company’s Managed Asset Division, the credit risk rating is reviewed and a portion of the outstanding loan balance may be deemed uncollectible or an impairment reserve may be established. The Company’s impairment analysis utilizes an independent re-appraisal of the collateral (unless such a third-party evaluation is not possible due to the unique nature of the collateral, such as a closely-held business or thinly traded securities). In the case of commercial real-estate collateral, an independent third party appraisal is ordered by the Company’s Real Estate Services Group to determine if there has been any change in the underlying collateral value. These independent appraisals are reviewed by the Real Estate Services Group and sometimes by independent third party valuation experts and may be adjusted depending upon market conditions.Through the credit risk rating process, loans are reviewed to determine if they are performing in accordance with the original contractual terms. If the borrower has failed to comply with the original contractual terms, further action may be required by the Company, including a downgrade in the credit risk rating, movement to non-accrual status, a charge-off or the establishment of a specific impairment reserve. If we determine that a loan amount, or portion thereof, is uncollectible, the loan’s credit risk rating is immediately downgraded to an 8 or 9 and the uncollectible amount is charged-off. Any loan that has a partial charge-off continues to be assigned a credit risk rating of an 8 or 9 for the duration of time that a balance remains outstanding. The Company undertakes a thorough and ongoing analysis to determine if additional impairment and/or charge-offs are appropriate and to begin a workout plan for the credit to minimize actual losses.If, based on current information and events, it is probable that the Company will be unable to collect all amounts due to it according to the contractual terms of the loan agreement, a specific impairment reserve is established. In determining the appropriate charge-off for collateral-dependent loans, the Company considers the results of appraisals for the associated collateral.Non-performing loans include all non-accrual loans (8 and 9 risk ratings) as well as loans 90 days past due and still accruing interest, excluding PCI loans. The remainder of the portfolio is considered performing under the contractual terms of the loan agreement. The following table presents the recorded investment based on performance of loans by class, excluding covered loans, per the most recent analysis at June 30, 2014, December 31, 2013 and June 30, 2013: Performing Non-performing Total(Dollars in thousands)June 30, 2014 December 31, 2013 June 30, 2013 June 30, 2014 December 31, 2013 June 30, 2013 June 30, 2014 December 31, 2013 June 30, 2013Loan Balances: Commercial Commercial and industrial$2,006,264 $1,826,063 $1,680,804 $6,216 $10,143 $15,432 $2,012,480 $1,836,206 $1,696,236Franchise223,456 220,383 202,240 — — — 223,456 220,383 202,240Mortgage warehouse lines of credit148,211 67,470 174,422 — — — 148,211 67,470 174,422Community Advantage—homeowners association94,009 90,894 83,003 — — — 94,009 90,894 83,003Aircraft7,847 10,241 13,174 — — — 7,847 10,241 13,174Asset-based lending778,049 734,456 683,785 295 637 1,916 778,344 735,093 685,701Tax exempt208,913 161,239 151,492 — — — 208,913 161,239 151,492Leases144,435 109,831 102,409 — — — 144,435 109,831 102,409Other9,792 11,147 98 — — — 9,792 11,147 98PCI - commercial (1)12,943 11,183 11,156 — — — 12,943 11,183 11,156Total commercial3,633,919 3,242,907 3,102,583 6,511 10,780 17,348 3,640,430 3,253,687 3,119,931Commercial real-estate Residential construction29,959 38,351 33,377 — 149 5,922 29,959 38,500 39,299Commercial construction154,220 129,737 130,186 839 6,969 7,857 155,059 136,706 138,043Land103,560 103,971 111,111 2,367 2,814 5,742 105,927 106,785 116,853Office656,967 632,154 591,433 10,950 10,087 6,324 667,917 642,241 597,757Industrial612,543 628,284 609,728 5,097 5,654 5,773 617,640 633,938 615,501Retail690,186 645,397 599,920 6,909 10,862 7,471 697,095 656,259 607,391Multi-family635,480 564,502 530,231 689 2,035 3,337 636,169 566,537 533,568Mixed use and other1,368,660 1,364,136 1,363,143 9,779 8,318 15,662 1,378,439 1,372,454 1,378,805PCI - commercial real-estate(1)65,267 76,615 67,411 — — — 65,267 76,615 67,411Total commercial real-estate4,316,842 4,183,147 4,036,540 36,630 46,888 58,088 4,353,472 4,230,035 4,094,628Home equity707,838 709,066 745,913 5,804 10,071 12,347 713,642 719,137 758,260Residential real-estate433,829 417,151 372,428 15,294 14,974 10,213 449,123 432,125 382,641PCI - residential real-estate (1)2,782 2,867 2,320 — — — 2,782 2,867 2,320Premium finance receivables Commercial insurance loans2,355,956 2,148,186 2,145,458 22,573 19,379 20,276 2,378,529 2,167,565 2,165,734Life insurance loans1,641,236 1,499,792 1,345,469 649 — 1,228 1,641,885 1,499,792 1,346,697PCI - life insurance loans (1)409,760 423,906 474,450 — — — 409,760 423,906 474,450Consumer and other158,986 165,042 169,908 1,189 1,242 1,985 160,175 166,284 171,893PCI - consumer and other(1)198 1,204 338 — — — 198 1,204 338Total loans, net of unearned income, excluding covered loans$13,661,346 $12,793,268 $12,395,407 $88,650 $103,334 $121,485 $13,749,996 $12,896,602 $12,516,892(1)PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 6 - Loans for further discussion of these purchased loans.