Fair Value of Assets and Liabilities - Summary Of Book Value And Estimated Fair Value Of Financial Instruments (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Assets:
Total loans, net of unearned income and allowance for loan losses		$ 30,860,804	$ 27,355,108
Short-term financial assets:
Interest-bearing cash		482,405	1,277,611
Federal funds sold		46,536	237,591
Securities purchased under agreements to resell		586,629	386,443
Trading securities		1,346,207	1,448,168
Loans held-for-sale	[1]	593,790	679,149
Securities available-for-sale (Note 3)		4,445,403	4,626,470
Securities held-to-maturity (Note 3)		10,000	10,000
Derivative assets		183,115	81,475
Other assets:
Total assets		43,310,900	40,832,258
Deposits:
Trading Liabilities		505,581	335,380
Short-term financial liabilities:
Federal funds purchased		548,344	256,567
Securities sold under agreements to repurchase		716,925	762,592
Other short-term borrowings		2,253,045	114,764
Term borrowings:
Other long term borrowings		791,368	1,170,963
Derivative liabilities		67,480	133,713
Total liabilities		38,234,892	36,046,878
Level 3 | FHLB-Cincinnati Stock
Term borrowings:
Restricted investments		76,000	87,900
Level 3 | FRB Stock
Term borrowings:
Restricted investments		130,700	130,700
Reported Value Measurement
Assets:
Total loans, net of unearned income and allowance for loan losses		30,860,804	27,355,108
Short-term financial assets:
Interest-bearing cash		482,405	1,277,611
Federal funds sold		46,536	237,591
Securities purchased under agreements to resell		586,629	386,443
Total short-term financial assets		1,115,570	1,901,645
Trading securities		1,346,207	1,448,168
Loans held-for-sale		593,790	679,149
Securities available-for-sale (Note 3)		4,445,403	4,626,470
Securities held-to-maturity (Note 3)		10,000	10,000
Derivative assets		183,115	81,475
Other assets:
Tax credit investments		247,075	163,300
Deferred compensation assets		46,815	37,771
Equity, mutual funds, and other		229,352	240,780
Total other assets		523,242	441,851
Total assets		39,078,131	36,543,866
Deposits:
Defined maturity		3,618,337	4,105,777
Trading Liabilities		505,581	335,380
Short-term financial liabilities:
Federal funds purchased		548,344	256,567
Securities sold under agreements to repurchase		716,925	762,592
Other short-term borrowings		2,253,045	114,764
Total short-term financial liabilities		3,518,314	1,133,923
Term borrowings:
Real estate investment trust-preferred		46,236	46,168
Term borrowings - new market tax credit investment			2,699
Secured borrowings		21,975	19,588
Junior subordinated debentures		144,593	143,255
Other long term borrowings		578,564	959,253
Total term borrowings		791,368	1,170,963
Derivative liabilities		67,480	133,713
Total liabilities		8,501,080	6,879,756
Reported Value Measurement | Commercial, financial, and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		19,928,605	16,415,381
Reported Value Measurement | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		4,300,905	3,999,559
Reported Value Measurement | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		5,987,125	6,223,077
Reported Value Measurement | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		161,571	211,448
Reported Value Measurement | Credit Card and Other
Assets:
Total loans, net of unearned income and allowance for loan losses		482,598	505,643
Reported Value Measurement | Mortgage Loans
Short-term financial assets:
Loans held-for-sale		14,033	16,273
Reported Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		493,525	578,291
Reported Value Measurement | Other Consumer Loans Class
Short-term financial assets:
Loans held-for-sale		5,197	25,134
Reported Value Measurement | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale		81,035	59,451
Estimate of Fair Value Measurement
Assets:
Total loans, net of unearned income and allowance for loan losses		31,218,152	27,364,329
Short-term financial assets:
Interest-bearing cash		482,405	1,277,611
Federal funds sold		46,536	237,591
Securities purchased under agreements to resell		586,629	386,443
Total short-term financial assets		1,115,570	1,901,645
Trading securities		1,346,207	1,448,168
Loans held-for-sale		596,535	684,349
Securities available-for-sale (Note 3)		4,445,403	4,626,470
Securities held-to-maturity (Note 3)		10,001	9,843
Derivative assets		183,115	81,475
Other assets:
Tax credit investments		244,755	159,452
Deferred compensation assets		46,815	37,771
Equity, mutual funds, and other		229,352	240,780
Total other assets		520,922	438,003
Total assets		39,435,905	36,554,282
Deposits:
Defined maturity		3,631,090	4,082,822
Trading Liabilities		505,581	335,380
Short-term financial liabilities:
Federal funds purchased		548,344	256,567
Securities sold under agreements to repurchase		716,925	762,592
Other short-term borrowings		2,253,045	114,764
Total short-term financial liabilities		3,518,314	1,133,923
Term borrowings:
Real estate investment trust-preferred		47,000	47,000
Term borrowings - new market tax credit investment			2,664
Secured borrowings		21,975	19,588
Junior subordinated debentures		142,375	134,266
Other long term borrowings		574,287	960,483
Total term borrowings		785,637	1,164,001
Derivative liabilities		67,480	133,713
Total liabilities		8,508,102	6,849,839
Loan commitments		3,656	2,551
Standby and other commitments		5,513	5,043
Estimate of Fair Value Measurement | Commercial, financial, and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		20,096,397	16,438,272
Estimate of Fair Value Measurement | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		4,300,489	3,997,736
Estimate of Fair Value Measurement | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		6,153,016	6,194,066
Estimate of Fair Value Measurement | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		181,171	227,254
Estimate of Fair Value Measurement | Credit Card and Other
Assets:
Total loans, net of unearned income and allowance for loan losses		487,079	507,001
Estimate of Fair Value Measurement | Mortgage Loans
Short-term financial assets:
Loans held-for-sale		14,033	16,273
Estimate of Fair Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		496,270	583,491
Estimate of Fair Value Measurement | Other Consumer Loans Class
Short-term financial assets:
Loans held-for-sale		5,197	25,134
Estimate of Fair Value Measurement | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale		81,035	59,451
Estimate of Fair Value Measurement | Level 1
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Short-term financial assets:
Interest-bearing cash		482,405	1,277,611
Federal funds sold		0	0
Securities purchased under agreements to resell		0	0
Total short-term financial assets		482,405	1,277,611
Trading securities		0	0
Loans held-for-sale		0	0
Securities available-for-sale (Note 3)		0	0
Securities held-to-maturity (Note 3)		0	0
Derivative assets		20,640	28,826
Other assets:
Tax credit investments		0	0
Deferred compensation assets		46,815	37,771
Equity, mutual funds, and other		22,643	22,248
Total other assets		69,458	60,019
Total assets		572,503	1,366,456
Deposits:
Defined maturity		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
Secured borrowings		0	0
Junior subordinated debentures		0	0
Other long term borrowings		0	0
Total term borrowings		0	0
Derivative liabilities		19,807	30,236
Total liabilities		19,807	30,236
Estimate of Fair Value Measurement | Level 1 | Commercial, financial, and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Level 1 | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Level 1 | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Level 1 | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | 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 | Level 1 | Mortgage Loans
Short-term financial assets:
Loans held-for-sale		0	0
Estimate of Fair Value Measurement | Level 1 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		0	0
Estimate of Fair Value Measurement | Level 1 | Other Consumer Loans Class
Short-term financial assets:
Loans held-for-sale		0	0
Estimate of Fair Value Measurement | Level 1 | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale		0	0
Estimate of Fair Value Measurement | 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		46,536	237,591
Securities purchased under agreements to resell		586,629	386,443
Total short-term financial assets		633,165	624,034
Trading securities		1,345,266	1,446,644
Loans held-for-sale		500,520	588,898
Securities available-for-sale (Note 3)		4,426,267	4,616,568
Securities held-to-maturity (Note 3)		0	0
Derivative assets		162,475	52,649
Other assets:
Tax credit investments		0	0
Deferred compensation assets		0	0
Equity, mutual funds, and other		0	0
Total other assets		0	0
Total assets		7,067,693	7,328,793
Deposits:
Defined maturity		3,631,090	4,082,822
Trading Liabilities		505,581	335,380
Short-term financial liabilities:
Federal funds purchased		548,344	256,567
Securities sold under agreements to repurchase		716,925	762,592
Other short-term borrowings		2,253,045	114,764
Total short-term financial liabilities		3,518,314	1,133,923
Term borrowings:
Real estate investment trust-preferred		0	0
Term borrowings - new market tax credit investment			0
Secured borrowings		0	0
Junior subordinated debentures		0	0
Other long term borrowings		574,287	960,483
Total term borrowings		574,287	960,483
Derivative liabilities		24,878	71,937
Total liabilities		8,254,150	6,584,545
Estimate of Fair Value Measurement | Level 2 | Commercial, financial, and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Level 2 | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Level 2 | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | Level 2 | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		0	0
Estimate of Fair Value Measurement | 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 | Level 2 | Mortgage Loans
Short-term financial assets:
Loans held-for-sale		0	0
Estimate of Fair Value Measurement | Level 2 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		495,323	582,476
Estimate of Fair Value Measurement | Level 2 | Other Consumer Loans Class
Short-term financial assets:
Loans held-for-sale		5,197	6,422
Estimate of Fair Value Measurement | Level 2 | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale		0	0
Estimate of Fair Value Measurement | Level 3
Assets:
Total loans, net of unearned income and allowance for loan losses		31,218,152	27,364,329
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		941	1,524
Loans held-for-sale		96,015	95,451
Securities available-for-sale (Note 3)		19,136	9,902
Securities held-to-maturity (Note 3)		10,001	9,843
Derivative assets		0	0
Other assets:
Tax credit investments		244,755	159,452
Deferred compensation assets		0	0
Equity, mutual funds, and other		206,709	218,532
Total other assets		451,464	377,984
Total assets		31,795,709	27,859,033
Deposits:
Defined maturity		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		47,000	47,000
Term borrowings - new market tax credit investment			2,664
Secured borrowings		21,975	19,588
Junior subordinated debentures		142,375	134,266
Other long term borrowings		0	0
Total term borrowings		211,350	203,518
Derivative liabilities		22,795	31,540
Total liabilities		234,145	235,058
Estimate of Fair Value Measurement | Level 3 | Commercial, financial, and industrial
Assets:
Total loans, net of unearned income and allowance for loan losses		20,096,397	16,438,272
Estimate of Fair Value Measurement | Level 3 | Commercial real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		4,300,489	3,997,736
Estimate of Fair Value Measurement | Level 3 | Consumer real estate
Assets:
Total loans, net of unearned income and allowance for loan losses		6,153,016	6,194,066
Estimate of Fair Value Measurement | Level 3 | Permanent Mortgage
Assets:
Total loans, net of unearned income and allowance for loan losses		181,171	227,254
Estimate of Fair Value Measurement | Level 3 | Credit Card and Other
Assets:
Total loans, net of unearned income and allowance for loan losses		487,079	507,001
Estimate of Fair Value Measurement | Level 3 | Mortgage Loans
Short-term financial assets:
Loans held-for-sale		14,033	16,273
Estimate of Fair Value Measurement | Level 3 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale		947	1,015
Estimate of Fair Value Measurement | Level 3 | Other Consumer Loans Class
Short-term financial assets:
Loans held-for-sale		0	18,712
Estimate of Fair Value Measurement | Level 3 | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale		81,035	59,451
Contractual Amount
Term borrowings:
Loan commitments		12,355,220	10,884,975
Standby and other commitments		$ 459,268	$ 446,958

[1] December 31, 2019 and 2018 include $6.8 million and $8.4 million, respectively, of held-for-sale consumer mortgage loans secured by residential real estate in process of foreclosure.