Fair Value Of Assets And Liabilities (Summary Of Book Value And Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Assets:
Total loans, net of unearned income and allowance for loan losses		$ 27,516,278	$ 27,469,374
Short-term financial assets:
Interest-bearing cash		750,634	1,185,600
Federal funds sold		91,303	87,364
Securities purchased under agreements to resell		782,765	725,609
Trading securities		1,649,470	1,416,345
Loans held-for-sale	[1]	692,659	699,377
Fair Value		4,724,411	5,170,255
Securities held-to-maturity		10,000	10,000
Derivative assets		122,056	81,634
Nonearning assets:
Cash and due from banks		602,952	639,073
Fixed income receivables		68,148	68,693
Total assets		41,076,795	41,423,388
Deposits:
Total deposits		30,977,867	30,620,362
Trading liabilities		743,721	638,515
Short-term financial liabilities:
Federal funds purchased		351,655	399,820
Securities sold under agreements to repurchase		713,152	656,602
Other short-term borrowings		1,836,852	2,626,213
Term borrowings:
Term borrowings		1,227,281	1,218,097
Derivative liabilities		135,349	85,061
Other noninterest-bearing liabilities:
Fixed income payables		14,739	48,996
Total liabilities		36,527,046	36,842,900
Level 3 | FHLB-Cincinnati
Other noninterest-bearing liabilities:
Restricted investments		87,900	87,900
Level 3 | FRB Stock
Other noninterest-bearing liabilities:
Restricted investments		130,600	134,600
Book Value
Assets:
Total loans, net of unearned income and allowance for loan losses		27,516,278	27,469,374
Short-term financial assets:
Interest-bearing cash			1,185,600
Federal funds sold			87,364
Securities purchased under agreements to resell			725,609
Total short-term financial assets		1,624,702	1,998,573
Trading securities		1,649,470	1,416,345
Loans held-for-sale		692,659
Fair Value		4,724,411	5,170,255
Securities held-to-maturity		10,000	10,000
Derivative assets		122,056	81,634
Other assets:
Tax credit investments		119,186	119,317
Deferred compensation mutual funds		40,068	39,822
Equity, mutual funds, and other		245,617
Total other assets		404,871	159,139
Nonearning assets:
Cash and due from banks			639,073
Fixed income receivables			68,693
Accrued interest receivable			97,239
Accrued interest receivable			805,005
Total assets		36,744,447	37,809,702
Deposits:
Defined maturity			3,322,921
Undefined maturity			27,297,441
Total deposits		3,543,987	30,620,362
Trading liabilities			638,515
Short-term financial liabilities:
Federal funds purchased			399,820
Securities sold under agreements to repurchase			656,602
Other short-term borrowings			2,626,213
Total short-term financial liabilities		2,901,659	3,682,635
Term borrowings:
Real estate investment trust-preferred		46,134	46,100
Term borrowings—new market tax credit investment		18,000	18,000
Secured borrowings		34,046	18,642
Junior subordinated debentures		187,950	187,281
Term borrowings		941,151	948,074
Total term borrowings		1,227,281	1,218,097
Derivative liabilities			85,061
Other noninterest-bearing liabilities:
Fixed income payables			48,996
Accrued interest payable			16,270
Total other noninterest-bearing liabilities			65,266
Total liabilities		8,551,997	36,309,936
Book Value | Commercial, financial and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		16,341,911	15,959,062
Book Value | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		4,102,524	4,186,268
Book Value | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		6,190,842	6,330,384
Book Value | Permanent mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		340,838	383,742
Book Value | Credit card & other
Assets:
Total loans, net of unearned income and allowance for loan losses		540,163	609,918
Book Value | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		18,940	88,173
Book Value | USDA & SBA loans- LOCOM
Short-term financial assets:
Loans held-for-sale		579,523	466,977
Book Value | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		30,175	144,227
Book Value | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		64,021
Fair Value
Assets:
Total loans, net of unearned income and allowance for loan losses		27,423,134	27,523,017
Short-term financial assets:
Interest-bearing cash		750,634	1,185,600
Federal funds sold		91,303	87,364
Securities purchased under agreements to resell		782,765	725,609
Total short-term financial assets		1,624,702	1,998,573
Trading securities		1,649,470	1,416,345
Loans held-for-sale		695,225
Fair Value		4,724,411	5,170,255
Securities held-to-maturity		9,786	9,901
Derivative assets		122,056	81,634
Other assets:
Tax credit investments		114,392	112,292
Deferred compensation mutual funds		40,068	39,822
Equity, mutual funds, and other		245,617
Total other assets		400,077	152,114
Nonearning assets:
Cash and due from banks			639,073
Fixed income receivables			68,693
Accrued interest receivable			97,239
Accrued interest receivable			805,005
Total assets		36,648,861	37,857,981
Deposits:
Defined maturity			3,293,650
Undefined maturity			27,297,431
Total deposits		3,518,069	30,591,081
Trading liabilities		743,721	638,515
Short-term financial liabilities:
Federal funds purchased		351,655	399,820
Securities sold under agreements to repurchase		713,152	656,602
Other short-term borrowings		1,836,852	2,626,213
Total short-term financial liabilities		2,901,659	3,682,635
Term borrowings:
Real estate investment trust-preferred		47,940	48,880
Term borrowings—new market tax credit investment		17,898	17,930
Secured borrowings		33,866	18,305
Junior subordinated debentures		187,950	187,281
Term borrowings		953,035	966,292
Total term borrowings		1,240,689	1,238,688
Derivative liabilities		135,349	85,061
Other noninterest-bearing liabilities:
Fixed income payables			48,996
Accrued interest payable			16,270
Total other noninterest-bearing liabilities			65,266
Total liabilities		8,539,487	36,301,246
Loan commitments		2,186	2,617
Standby and other commitments		5,028	5,274
Fair Value | Commercial, financial and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		16,289,383	15,990,991
Fair Value | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		4,106,951	4,215,367
Fair Value | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		6,139,842	6,320,308
Fair Value | Permanent mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		347,349	388,396
Fair Value | Credit card & other
Assets:
Total loans, net of unearned income and allowance for loan losses		539,609	607,955
Fair Value | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		18,940	88,173
Fair Value | USDA & SBA loans- LOCOM
Short-term financial assets:
Loans held-for-sale		582,089	468,737
Fair Value | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		30,175	144,227
Fair Value | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		64,021
Fair Value | Level 1
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Short-term financial assets:
Interest-bearing cash		750,634	1,185,600
Federal funds sold		0	0
Securities purchased under agreements to resell		0	0
Total short-term financial assets		750,634	1,185,600
Trading securities		0	0
Loans held-for-sale		0
Fair Value		0	27,017
Securities held-to-maturity		0	0
Derivative assets		19,127	10,161
Other assets:
Tax credit investments		0	0
Deferred compensation mutual funds		40,068	39,822
Equity, mutual funds, and other		27,135
Total other assets		67,203	39,822
Nonearning assets:
Cash and due from banks			639,073
Fixed income receivables			0
Accrued interest receivable			0
Accrued interest receivable			639,073
Total assets		836,964	1,901,673
Deposits:
Defined maturity			0
Undefined maturity			0
Total deposits		0	0
Trading liabilities		0	0
Short-term financial liabilities:
Federal funds purchased		0	0
Securities sold under agreements to repurchase		0	0
Other short-term borrowings		0	0
Total short-term financial liabilities		0	0
Term borrowings:
Real estate investment trust-preferred		0	0
Term borrowings—new market tax credit investment		0	0
Secured borrowings		0	0
Junior subordinated debentures		0	0
Term borrowings		0	0
Total term borrowings		0	0
Derivative liabilities		18,738	9,535
Other noninterest-bearing liabilities:
Fixed income payables			0
Accrued interest payable			0
Total other noninterest-bearing liabilities			0
Total liabilities		18,738	9,535
Fair Value | Level 1 | Commercial, financial and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 1 | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 1 | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 1 | Permanent mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 1 | Credit card & other
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 1 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		0	0
Fair Value | Level 1 | USDA & SBA loans- LOCOM
Short-term financial assets:
Loans held-for-sale		0	0
Fair Value | Level 1 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		0	0
Fair Value | Level 1 | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		0
Fair Value | Level 2
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Short-term financial assets:
Interest-bearing cash		0	0
Federal funds sold		91,303	87,364
Securities purchased under agreements to resell		782,765	725,609
Total short-term financial assets		874,068	812,973
Trading securities		1,647,746	1,414,194
Loans held-for-sale		590,232
Fair Value		4,718,624	4,903,115
Securities held-to-maturity		0	0
Derivative assets		102,929	71,473
Other assets:
Tax credit investments		0	0
Deferred compensation mutual funds		0	0
Equity, mutual funds, and other		0
Total other assets		0	0
Nonearning assets:
Cash and due from banks			0
Fixed income receivables			68,693
Accrued interest receivable			97,239
Accrued interest receivable			165,932
Total assets		7,933,599	7,851,781
Deposits:
Defined maturity			3,293,650
Undefined maturity			27,297,431
Total deposits		3,518,069	30,591,081
Trading liabilities		743,721	638,515
Short-term financial liabilities:
Federal funds purchased		351,655	399,820
Securities sold under agreements to repurchase		713,152	656,602
Other short-term borrowings		1,836,852	2,626,213
Total short-term financial liabilities		2,901,659	3,682,635
Term borrowings:
Real estate investment trust-preferred		0	0
Term borrowings—new market tax credit investment		0	0
Secured borrowings		0	0
Junior subordinated debentures		0	0
Term borrowings		953,035	966,292
Total term borrowings		953,035	966,292
Derivative liabilities		107,186	69,881
Other noninterest-bearing liabilities:
Fixed income payables			48,996
Accrued interest payable			16,270
Total other noninterest-bearing liabilities			65,266
Total liabilities		8,223,670	36,013,670
Fair Value | Level 2 | Commercial, financial and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 2 | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 2 | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 2 | Permanent mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 2 | Credit card & other
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Fair Value | Level 2 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		2,222	6,902
Fair Value | Level 2 | USDA & SBA loans- LOCOM
Short-term financial assets:
Loans held-for-sale		581,051	467,227
Fair Value | Level 2 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		6,959	9,965
Fair Value | Level 2 | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		0
Fair Value | Level 3
Assets:
Total loans, net of unearned income and allowance for loan losses		27,423,134	27,523,017
Short-term financial assets:
Interest-bearing cash		0	0
Federal funds sold		0	0
Securities purchased under agreements to resell		0	0
Total short-term financial assets		0	0
Trading securities		1,724	2,151
Loans held-for-sale		104,993
Fair Value		5,787	240,123
Securities held-to-maturity		9,786	9,901
Derivative assets		0	0
Other assets:
Tax credit investments		114,392	112,292
Deferred compensation mutual funds		0	0
Equity, mutual funds, and other		218,482
Total other assets		332,874	112,292
Nonearning assets:
Cash and due from banks			0
Fixed income receivables			0
Accrued interest receivable			0
Accrued interest receivable			0
Total assets		27,878,298	28,104,527
Deposits:
Defined maturity			0
Undefined maturity			0
Total deposits		0	0
Trading liabilities		0	0
Short-term financial liabilities:
Federal funds purchased		0	0
Securities sold under agreements to repurchase		0	0
Other short-term borrowings		0	0
Total short-term financial liabilities		0	0
Term borrowings:
Real estate investment trust-preferred		47,940	48,880
Term borrowings—new market tax credit investment		17,898	17,930
Secured borrowings		33,866	18,305
Junior subordinated debentures		187,950	187,281
Term borrowings		0	0
Total term borrowings		287,654	272,396
Derivative liabilities		9,425	5,645
Other noninterest-bearing liabilities:
Fixed income payables			0
Accrued interest payable			0
Total other noninterest-bearing liabilities			0
Total liabilities		297,079	278,041
Fair Value | Level 3 | Commercial, financial and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		16,289,383	15,990,991
Fair Value | Level 3 | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		4,106,951	4,215,367
Fair Value | Level 3 | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		6,139,842	6,320,308
Fair Value | Level 3 | Permanent mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		347,349	388,396
Fair Value | Level 3 | Credit card & other
Assets:
Total loans, net of unearned income and allowance for loan losses		539,609	607,955
Fair Value | Level 3 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		16,718	81,271
Fair Value | Level 3 | USDA & SBA loans- LOCOM
Short-term financial assets:
Loans held-for-sale		1,038	1,510
Fair Value | Level 3 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		23,216	134,262
Fair Value | Level 3 | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		64,021
Contractual Amount
Other noninterest-bearing liabilities:
Loan commitments		10,228,615	10,678,485
Standby and other commitments		$ 464,600	$ 420,728

[1] June 30, 2018 and December 31, 2017 include $8.9 million and $11.7 million, respectively, of held-for-sale consumer mortgage loans secured by residential real estate in process of foreclosure.