Fair Value Of Assets And Liabilities (Summary Of Book Value And Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Assets:
Total loans, net of unearned income and allowance for loan losses		$ 27,062,599	$ 27,469,374
Short-term financial assets:
Interest-bearing cash		309,351	1,185,600
Federal funds sold		62,541	87,364
Securities purchased under agreements to resell		910,670	725,609
Trading securities		1,759,430	1,416,345
Loans held-for-sale	[1]	770,412	699,377
Securities available-for-sale		4,826,155	5,170,255
Held-to-maturity Securities		10,000	10,000
Derivative assets		114,348	81,634
Nonearning assets:
Cash and due from banks		459,820	639,073
Fixed income receivables		94,036	68,693
Total assets		40,463,195	41,423,388
Deposits:
Total deposits		30,818,951	30,620,362
Trading Liabilities		827,362	638,515
Short-term financial liabilities:
Federal Funds Purchased		392,714	399,820
Securities sold under agreements to repurchase		672,154	656,602
Other short-term borrowings		1,332,141	2,626,213
Term borrowings:
Term borrowings		1,214,967	1,218,097
Derivative liabilities		121,394	85,061
Other noninterest-bearing liabilities:
Fixed income payables		6,167	48,996
Total liabilities		35,890,667	36,842,900
Fair Value, Inputs, Level 3 | FHLB-Cincinnati Stock
Other noninterest-bearing liabilities:
Restricted investments		87,900	87,900
Fair Value, Inputs, Level 3 | FRB Stock [Member]
Other noninterest-bearing liabilities:
Restricted investments		130,500	134,600
Reported Value Measurement
Assets:
Total loans, net of unearned income and allowance for loan losses		27,062,599	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		1,282,562	1,998,573
Trading securities		1,759,430	1,416,345
Loans held-for-sale		770,412
Securities available-for-sale			5,170,255
Held-to-maturity Securities		10,000	10,000
Derivative assets			81,634
Other assets:
Tax credit investments		116,023	119,317
Deferred compensation assets		40,466	39,822
Securities Borrowed, Fair Value Disclosure		245,304
Total other assets		401,793	159,139
Nonearning assets:
Cash and due from banks			639,073
Fixed income receivables			68,693
Accrued interest receivable			97,239
Total nonearning assets			805,005
Total assets		36,227,299	37,809,702
Deposits:
Defined maturity		3,328,732	3,322,921
Undefined maturity			27,297,441
Total deposits			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		2,397,009	3,682,635
Term borrowings:
Real estate investment trust-preferred		46,117	46,100
Term borrowings - new market tax credit investment		18,000	18,000
Borrowings secured by residential real estate		21,147	18,642
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust		187,615	187,281
Term borrowings		942,088	948,074
Total term borrowings		1,214,967	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		7,889,464	36,309,936
Reported Value Measurement | Commercial Financial And Industrial Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		15,728,070	15,959,062
Reported Value Measurement | Commercial Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		4,205,378	4,186,268
Reported Value Measurement | Consumer Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		6,213,802	6,330,384
Reported Value Measurement | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		364,253	383,742
Reported Value Measurement | Credit Card and Other
Assets:
Total loans, net of unearned income and allowance for loan losses		551,096	609,918
Reported Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		21,209	88,173
Reported Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		533,106	466,977
Reported Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		151,296	144,227
Reported Value Measurement | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		64,801
Estimate of Fair Value Measurement
Assets:
Total loans, net of unearned income and allowance for loan losses		27,074,150	27,523,017
Short-term financial assets:
Interest-bearing cash		309,351	1,185,600
Federal funds sold		62,541	87,364
Securities purchased under agreements to resell		910,670	725,609
Total short-term financial assets		1,282,562	1,998,573
Trading securities		1,759,430	1,416,345
Loans held-for-sale		772,290
Securities available-for-sale		4,826,155	5,170,255
Held-to-maturity Securities		9,817	9,901
Derivative assets		114,348	81,634
Other assets:
Tax credit investments		109,970	112,292
Deferred compensation assets		40,466	39,822
Securities Borrowed, Fair Value Disclosure		245,304
Total other assets		395,740	152,114
Nonearning assets:
Cash and due from banks			639,073
Fixed income receivables			68,693
Accrued interest receivable			97,239
Total nonearning assets			805,005
Total assets		36,234,492	37,857,981
Deposits:
Defined maturity		3,282,918	3,293,650
Undefined maturity			27,297,431
Total deposits			30,591,081
Trading Liabilities		827,362	638,515
Short-term financial liabilities:
Federal Funds Purchased		392,714	399,820
Securities sold under agreements to repurchase		672,154	656,602
Other short-term borrowings		1,332,141	2,626,213
Total short-term financial liabilities		2,397,009	3,682,635
Term borrowings:
Real estate investment trust-preferred		48,410	48,880
Term borrowings - new market tax credit investment		17,887	17,930
Borrowings secured by residential real estate		20,889	18,305
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust		187,615	187,281
Term borrowings		954,951	966,292
Total term borrowings		1,229,752	1,238,688
Derivative liabilities		121,394	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		7,858,435	36,301,246
Loan commitments		2,384	2,617
Standby and other commitments		5,729	5,274
Estimate of Fair Value Measurement | Commercial Financial And Industrial Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		15,744,075	15,990,991
Estimate of Fair Value Measurement | Commercial Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		4,217,348	4,215,367
Estimate of Fair Value Measurement | Consumer Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		6,188,128	6,320,308
Estimate of Fair Value Measurement | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		371,219	388,396
Estimate of Fair Value Measurement | Credit Card and Other
Assets:
Total loans, net of unearned income and allowance for loan losses		553,380	607,955
Estimate of Fair Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		21,209	88,173
Estimate of Fair Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		534,984	468,737
Estimate of Fair Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		151,296	144,227
Estimate of Fair Value Measurement | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		64,801
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Short-term financial assets:
Interest-bearing cash		309,351	1,185,600
Federal funds sold		0	0
Securities purchased under agreements to resell		0	0
Total short-term financial assets		309,351	1,185,600
Trading securities		0	0
Loans held-for-sale		0
Securities available-for-sale		0	27,017
Held-to-maturity Securities		0	0
Derivative assets		19,491	10,161
Other assets:
Tax credit investments		0	0
Deferred compensation assets		40,466	39,822
Securities Borrowed, Fair Value Disclosure		26,967
Total other assets		67,433	39,822
Nonearning assets:
Cash and due from banks			639,073
Fixed income receivables			0
Accrued interest receivable			0
Total nonearning assets			639,073
Total assets		396,275	1,901,673
Deposits:
Defined maturity		0	0
Undefined maturity			0
Total deposits			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
Borrowings secured by residential real estate		0	0
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust		0	0
Term borrowings		0	0
Total term borrowings		0	0
Derivative liabilities		18,558	9,535
Other noninterest-bearing liabilities:
Fixed income payables			0
Accrued interest payable			0
Total other noninterest-bearing liabilities			0
Total liabilities		18,558	9,535
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Commercial Financial And Industrial Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Commercial Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Consumer Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Credit Card and Other
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		0
Estimate of Fair Value Measurement | Fair Value, Inputs, 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		62,541	87,364
Securities purchased under agreements to resell		910,670	725,609
Total short-term financial assets		973,211	812,973
Trading securities		1,757,504	1,414,194
Loans held-for-sale		564,302
Securities available-for-sale		4,823,422	4,903,115
Held-to-maturity Securities		0	0
Derivative assets		94,857	71,473
Other assets:
Tax credit investments		0	0
Deferred compensation assets		0	0
Securities Borrowed, Fair Value Disclosure		0
Total other assets		0	0
Nonearning assets:
Cash and due from banks			0
Fixed income receivables			68,693
Accrued interest receivable			97,239
Total nonearning assets			165,932
Total assets		8,213,296	7,851,781
Deposits:
Defined maturity		3,282,918	3,293,650
Undefined maturity			27,297,431
Total deposits			30,591,081
Trading Liabilities		827,362	638,515
Short-term financial liabilities:
Federal Funds Purchased		392,714	399,820
Securities sold under agreements to repurchase		672,154	656,602
Other short-term borrowings		1,332,141	2,626,213
Total short-term financial liabilities		2,397,009	3,682,635
Term borrowings:
Real estate investment trust-preferred		0	0
Term borrowings - new market tax credit investment		0	0
Borrowings secured by residential real estate		0	0
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust		0	0
Term borrowings		954,951	966,292
Total term borrowings		954,951	966,292
Derivative liabilities		97,191	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		7,559,431	36,013,670
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Commercial Financial And Industrial Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Commercial Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Consumer Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Credit Card and Other
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		2,875	6,902
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		533,529	467,227
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		24,170	9,965
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		3,728
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Assets:
Total loans, net of unearned income and allowance for loan losses		27,074,150	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		1,926	2,151
Loans held-for-sale		207,988
Securities available-for-sale		2,733	240,123
Held-to-maturity Securities		9,817	9,901
Derivative assets		0	0
Other assets:
Tax credit investments		109,970	112,292
Deferred compensation assets		0	0
Securities Borrowed, Fair Value Disclosure		218,337
Total other assets		328,307	112,292
Nonearning assets:
Cash and due from banks			0
Fixed income receivables			0
Accrued interest receivable			0
Total nonearning assets			0
Total assets		27,624,921	28,104,527
Deposits:
Defined maturity		0	0
Undefined maturity			0
Total deposits			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		48,410	48,880
Term borrowings - new market tax credit investment		17,887	17,930
Borrowings secured by residential real estate		20,889	18,305
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust		187,615	187,281
Term borrowings		0	0
Total term borrowings		274,801	272,396
Derivative liabilities		5,645	5,645
Other noninterest-bearing liabilities:
Fixed income payables			0
Accrued interest payable			0
Total other noninterest-bearing liabilities			0
Total liabilities		280,446	278,041
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial Financial And Industrial Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		15,744,075	15,990,991
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		4,217,348	4,215,367
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Consumer Real Estate
Assets:
Total loans, net of unearned income and allowance for loan losses		6,188,128	6,320,308
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		371,219	388,396
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Credit Card and Other
Assets:
Total loans, net of unearned income and allowance for loan losses		553,380	607,955
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale		18,334	81,271
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		1,455	1,510
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale		127,126	134,262
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale		61,073
Contractual Amount
Other noninterest-bearing liabilities:
Loan commitments		10,746,730	10,678,485
Standby and other commitments		$ 418,598	$ 420,728

[1] March 31, 2018 and December 31, 2017 include $9.1 million and $11.7 million, respectively, of held-for-sale consumer mortgage loans secured by residential real estate in process of foreclosure.(b)