Fair Value Of Assets And Liabilities (Summary Of Book Value And Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Assets:
Total loans, net of unearned income and allowance for loan losses		$ 19,971,224	$ 19,387,452
Short-term financial assets:
Interest-bearing cash		604,326	1,060,034
Federal funds sold		76,316	50,838
Securities purchased under agreements to resell		663,637	613,682
Trading securities		1,469,402	897,071
Loans held-for-sale	[1]	339,780	111,248
Securities available-for-sale		3,963,138	3,943,499
Held-to-maturity Securities		10,000	14,347
Derivative assets		80,976	121,654
Nonearning assets:
Cash and due from banks		347,802	373,274
Fixed income receivables		68,750	57,411
Total assets		29,622,636	28,555,231
Deposits:
Total deposits		22,099,254	22,672,363
Trading Liabilities		579,028	561,848
Short-term financial liabilities:
Federal Funds Purchased		292,650	414,207
Securities sold under agreements to repurchase		516,867	453,053
Other short-term borrowings		1,637,419	83,177
Term borrowings:
Total term borrowings		1,059,507	1,040,656
Derivative liabilities		83,146	135,897
Other noninterest-bearing liabilities:
Fixed income payables		44,304	21,002
Total liabilities		26,739,085	25,850,147
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		68,600	68,600
Reported Value Measurement
Assets:
Total loans, net of unearned income and allowance for loan losses		19,971,224	19,387,452
Short-term financial assets:
Interest-bearing cash		604,326	1,060,034
Federal funds sold		76,316	50,838
Securities purchased under agreements to resell		663,637	613,682
Total short-term financial assets		1,344,279	1,724,554
Trading securities		1,469,402	897,071
Loans held-for-sale		339,780	111,248
Securities available-for-sale		3,963,138	3,943,499
Held-to-maturity Securities		10,000	14,347
Derivative assets		80,976	121,654
Other assets:
Tax credit investments		120,701	100,105
Deferred compensation assets		34,951	32,840
Total other assets		155,652	132,945
Nonearning assets:
Cash and due from banks		347,802	373,274
Fixed income receivables		68,750	57,411
Accrued interest receivable		70,058	62,887
Total nonearning assets		486,610	493,572
Total assets		27,821,061	26,826,342
Deposits:
Defined maturity		1,112,098	1,355,133
Undefined maturity		20,987,156	21,317,230
Total deposits		22,099,254	22,672,363
Trading Liabilities		579,028	561,848
Short-term financial liabilities:
Federal Funds Purchased		292,650	414,207
Securities sold under agreements to repurchase		516,867	453,053
Other short-term borrowings		1,637,419	83,177
Total short-term financial liabilities		2,446,936	950,437
Term borrowings:
Real estate investment trust-preferred		46,083	46,032
Term borrowings - new market tax credit investment		18,000	18,000
Borrowings secured by residential real estate		42,585	23,126
Other long term borrowings		952,839	953,498
Total term borrowings		1,059,507	1,040,656
Derivative liabilities		83,146	135,897
Other noninterest-bearing liabilities:
Fixed income payables		44,304	21,002
Accrued interest payable		19,205	10,336
Total other noninterest-bearing liabilities		63,509	31,338
Total liabilities		26,331,380	25,392,539
Reported Value Measurement | Commercial Financial And Industrial Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		12,693,639	12,058,689
Reported Value Measurement | Commercial Real Estate Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		2,221,332	2,101,671
Reported Value Measurement | Consumer Real Estate Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		4,328,778	4,473,395
Reported Value Measurement | Permanent Mortgage Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		387,363	406,836
Reported Value Measurement | Credit Card And Other Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		340,112	346,861
Estimate of Fair Value Measurement
Assets:
Total loans, net of unearned income and allowance for loan losses		19,851,724	19,134,856
Short-term financial assets:
Interest-bearing cash		604,326	1,060,034
Federal funds sold		76,316	50,838
Securities purchased under agreements to resell		663,637	613,682
Total short-term financial assets		1,344,279	1,724,554
Trading securities		1,469,402	897,071
Loans held-for-sale		340,441	111,248
Securities available-for-sale		3,963,138	3,943,499
Held-to-maturity Securities		9,985	14,773
Derivative assets		80,976	121,654
Other assets:
Tax credit investments		121,435	98,400
Deferred compensation assets		34,951	32,840
Total other assets		156,386	131,240
Nonearning assets:
Cash and due from banks		347,802	373,274
Fixed income receivables		68,750	57,411
Accrued interest receivable		70,058	62,887
Total nonearning assets		486,610	493,572
Total assets		27,702,941	26,572,467
Deposits:
Defined maturity		1,108,919	1,361,104
Undefined maturity		20,987,156	21,317,230
Total deposits		22,096,075	22,678,334
Trading Liabilities		579,028	561,848
Short-term financial liabilities:
Federal Funds Purchased		292,650	414,207
Securities sold under agreements to repurchase		516,867	453,053
Other short-term borrowings		1,637,419	83,177
Total short-term financial liabilities		2,446,936	950,437
Term borrowings:
Real estate investment trust-preferred		49,350	49,350
Term borrowings - new market tax credit investment		17,959	17,918
Borrowings secured by residential real estate		42,184	21,969
Other long term borrowings		968,297	965,066
Total term borrowings		1,077,790	1,054,303
Derivative liabilities		83,146	135,897
Other noninterest-bearing liabilities:
Fixed income payables		44,304	21,002
Accrued interest payable		19,205	10,336
Total other noninterest-bearing liabilities		63,509	31,338
Total liabilities		26,346,484	25,412,157
Loan commitments		2,388	2,924
Standby and other commitments		4,139	4,037
Estimate of Fair Value Measurement | Commercial Financial And Industrial Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		12,658,237	11,918,374
Estimate of Fair Value Measurement | Commercial Real Estate Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		2,208,208	2,078,306
Estimate of Fair Value Measurement | Consumer Real Estate Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		4,252,704	4,385,669
Estimate of Fair Value Measurement | Permanent Mortgage Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		392,407	404,930
Estimate of Fair Value Measurement | Credit Card And Other Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		340,168	347,577
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		604,326	1,060,034
Federal funds sold		0	0
Securities purchased under agreements to resell		0	0
Total short-term financial assets		604,326	1,060,034
Trading securities		0	0
Loans held-for-sale		0	0
Securities available-for-sale		24,756	25,249
Held-to-maturity Securities		0	0
Derivative assets		10,003	33,587
Other assets:
Tax credit investments		0	0
Deferred compensation assets		34,951	32,840
Total other assets		34,951	32,840
Nonearning assets:
Cash and due from banks		347,802	373,274
Fixed income receivables		0	0
Accrued interest receivable		0	0
Total nonearning assets		347,802	373,274
Total assets		1,021,838	1,524,984
Deposits:
Defined maturity		0	0
Undefined maturity		0	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
Borrowings secured by residential real estate		0	0
Other long term borrowings		0	0
Total term borrowings		0	0
Derivative liabilities		7,627	33,274
Other noninterest-bearing liabilities:
Fixed income payables		0	0
Accrued interest payable		0	0
Total other noninterest-bearing liabilities		0	0
Total liabilities		7,627	33,274
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 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 | Consumer Real Estate 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 | Permanent Mortgage 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 | Credit Card And Other 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
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		76,316	50,838
Securities purchased under agreements to resell		663,637	613,682
Total short-term financial assets		739,953	664,520
Trading securities		1,467,097	894,498
Loans held-for-sale		246,441	6,631
Securities available-for-sale		3,773,600	3,756,745
Held-to-maturity Securities		0	0
Derivative assets		70,973	88,067
Other assets:
Tax credit investments		0	0
Deferred compensation assets		0	0
Total other assets		0	0
Nonearning assets:
Cash and due from banks		0	0
Fixed income receivables		68,750	57,411
Accrued interest receivable		70,058	62,887
Total nonearning assets		138,808	120,298
Total assets		6,436,872	5,530,759
Deposits:
Defined maturity		1,108,919	1,361,104
Undefined maturity		20,987,156	21,317,230
Total deposits		22,096,075	22,678,334
Trading Liabilities		579,028	561,848
Short-term financial liabilities:
Federal Funds Purchased		292,650	414,207
Securities sold under agreements to repurchase		516,867	453,053
Other short-term borrowings		1,637,419	83,177
Total short-term financial liabilities		2,446,936	950,437
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
Other long term borrowings		968,297	965,066
Total term borrowings		968,297	965,066
Derivative liabilities		69,989	96,378
Other noninterest-bearing liabilities:
Fixed income payables		44,304	21,002
Accrued interest payable		19,205	10,336
Total other noninterest-bearing liabilities		63,509	31,338
Total liabilities		26,223,834	25,283,401
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 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 | Consumer Real Estate 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 | Permanent Mortgage 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 | Credit Card And Other 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 3
Assets:
Total loans, net of unearned income and allowance for loan losses		19,851,724	19,134,856
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		2,305	2,573
Loans held-for-sale		94,000	104,617
Securities available-for-sale		164,782	161,505
Held-to-maturity Securities		9,985	14,773
Derivative assets		0	0
Other assets:
Tax credit investments		121,435	98,400
Deferred compensation assets		0	0
Total other assets		121,435	98,400
Nonearning assets:
Cash and due from banks		0	0
Fixed income receivables		0	0
Accrued interest receivable		0	0
Total nonearning assets		0	0
Total assets		20,244,231	19,516,724
Deposits:
Defined maturity		0	0
Undefined maturity		0	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		49,350	49,350
Term borrowings - new market tax credit investment		17,959	17,918
Borrowings secured by residential real estate		42,184	21,969
Other long term borrowings		0	0
Total term borrowings		109,493	89,237
Derivative liabilities		5,530	6,245
Other noninterest-bearing liabilities:
Fixed income payables		0	0
Accrued interest payable		0	0
Total other noninterest-bearing liabilities		0	0
Total liabilities		115,023	95,482
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		12,658,237	11,918,374
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial Real Estate Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		2,208,208	2,078,306
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Consumer Real Estate Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		4,252,704	4,385,669
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Permanent Mortgage Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		392,407	404,930
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Credit Card And Other Portfolio Segment
Assets:
Total loans, net of unearned income and allowance for loan losses		340,168	347,577
Contractual Amount
Other noninterest-bearing liabilities:
Loan commitments		8,868,115	8,744,649
Standby and other commitments		$ 336,953	$ 277,549

[1] September 30, 2017 and December 31, 2016 include $12.8 million and $19.3 million, respectively, of held-for-sale consumer mortgage loans secured by residential real estate in process of foreclosure.