Fair Value of Assets & Liabilities - Summary Of Book Value And Estimated Fair Value Of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	$ 32,933,813	$ 30,860,804
Short-term financial assets:
Interest-bearing cash	670,525	482,405
Federal funds sold	30,050	46,536
Securities purchased under agreements to resell	562,435	586,629
Trading securities	1,877,514	1,346,207
Securities available-for-sale	4,544,907	4,445,403
Securities held-to-maturity	10,000	10,000
Derivative assets	695,853	182,984
Other assets:
Total assets	47,197,378	43,310,900
Liabilities:
Trading Liabilities	452,611	505,581
Short-term financial liabilities:
Federal funds purchased	476,013	548,344
Securities sold under agreements to repurchase	788,595	716,925
Other short-term borrowings	4,060,673	2,253,045
Term borrowings:
Other long term borrowings	792,751	791,368
Derivative liabilities	213,584	44,238
Total liabilities	42,141,798	38,234,892
Fair Value, Inputs, Level 3 | FHLB-Cincinnati Stock
Term borrowings:
Restricted investments	562,000	76,000
Fair Value, Inputs, Level 3 | FRB Stock
Term borrowings:
Restricted investments	130,700	130,700
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	32,933,813	30,860,804
Short-term financial assets:
Interest-bearing cash	670,525	482,405
Federal funds sold	30,050	46,536
Securities purchased under agreements to resell	562,435	586,629
Total short-term financial assets	1,263,010	1,115,570
Trading securities	1,877,514	1,346,207
Loans held-for-sale	595,601	593,790
Securities available-for-sale	4,544,907	4,445,403
Securities held-to-maturity	10,000	10,000
Derivative assets	696,250	183,115
Other assets:
Tax credit investments	250,596	247,075
Deferred compensation assets	41,666	46,815
Equity, mutual funds, and other	715,549	229,352
Total other assets	1,007,811	523,242
Total assets	42,928,906	39,078,131
Liabilities:
Defined maturity	3,058,198	3,618,337
Trading Liabilities	452,611	505,581
Short-term financial liabilities:
Federal funds purchased	476,013	548,344
Securities sold under agreements to repurchase	788,595	716,925
Other short-term borrowings	4,060,673	2,253,045
Short Term Financial Liabilities	5,325,281	3,518,314
Term borrowings:
Real estate investment trust-preferred	46,253	46,236
Secured Borrowings	17,315	21,975
Junior subordinated debentures	144,928	144,593
Other long term borrowings	584,255	578,564
Total term borrowings	792,751	791,368
Derivative liabilities	234,984	67,480
Total liabilities	9,863,825	8,501,080
Reported Value Measurement | Commercial, financial, and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	21,869,914	19,928,605
Reported Value Measurement | Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	4,592,067	4,300,905
Reported Value Measurement | Consumer Real Estate (a)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	5,996,361	6,148,696
Reported Value Measurement | Credit Card and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	475,471	482,598
Reported Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale	13,584	14,033
Reported Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	494,766	493,525
Reported Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale	4,940	5,197
Reported Value Measurement | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale	82,311	81,035
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	33,321,229	31,218,152
Short-term financial assets:
Interest-bearing cash	670,525	482,405
Federal funds sold	30,050	46,536
Securities purchased under agreements to resell	562,435	586,629
Total short-term financial assets	1,263,010	1,115,570
Trading securities	1,877,514	1,346,207
Loans held-for-sale	598,811	596,535
Securities available-for-sale	4,544,907	4,445,403
Securities held-to-maturity	9,824	10,001
Derivative assets	696,250	183,115
Other assets:
Tax credit investments	249,450	244,755
Deferred compensation assets	41,666	46,815
Equity, mutual funds, and other	715,549	229,352
Total other assets	1,006,665	520,922
Total assets	43,318,210	39,435,905
Liabilities:
Defined maturity	3,105,082	3,631,090
Trading Liabilities	452,611	505,581
Short-term financial liabilities:
Federal funds purchased	476,013	548,344
Securities sold under agreements to repurchase	788,595	716,925
Other short-term borrowings	4,060,673	2,253,045
Short Term Financial Liabilities	5,325,281	3,518,314
Term borrowings:
Real estate investment trust-preferred	47,000	47,000
Secured Borrowings	17,315	21,975
Junior subordinated debentures	129,200	142,375
Other long term borrowings	560,530	574,287
Total term borrowings	754,045	785,637
Derivative liabilities	234,984	67,480
Total liabilities	9,872,003	8,508,102
Loan commitments	2,909	3,656
Standby and other commitments	6,211	5,513
Estimate of Fair Value Measurement | Commercial, financial, and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	22,072,783	20,096,397
Estimate of Fair Value Measurement | Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	4,624,811	4,300,489
Estimate of Fair Value Measurement | Consumer Real Estate (a)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	6,141,872	6,334,187
Estimate of Fair Value Measurement | Credit Card and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	481,763	487,079
Estimate of Fair Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale	13,584	14,033
Estimate of Fair Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	497,976	496,270
Estimate of Fair Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale	4,940	5,197
Estimate of Fair Value Measurement | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale	82,311	81,035
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	0	0
Short-term financial assets:
Interest-bearing cash	670,525	482,405
Federal funds sold	0	0
Securities purchased under agreements to resell	0	0
Total short-term financial assets	670,525	482,405
Trading securities	0	0
Loans held-for-sale	0	0
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Derivative assets	165,516	20,640
Other assets:
Tax credit investments	0	0
Deferred compensation assets	41,666	46,815
Equity, mutual funds, and other	22,833	22,643
Total other assets	64,499	69,458
Total assets	900,540	572,503
Liabilities:
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
Short Term Financial Liabilities	0	0
Term borrowings:
Real estate investment trust-preferred	0	0
Secured Borrowings	0	0
Junior subordinated debentures	0	0
Other long term borrowings	0	0
Total term borrowings	0	0
Derivative liabilities	171,604	19,807
Total liabilities	171,604	19,807
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Commercial, financial, and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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 (a)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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	30,050	46,536
Securities purchased under agreements to resell	562,435	586,629
Total short-term financial assets	592,485	633,165
Trading securities	1,876,729	1,345,266
Loans held-for-sale	502,011	500,520
Securities available-for-sale	4,521,803	4,426,267
Securities held-to-maturity	0	0
Derivative assets	530,454	162,475
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	8,023,482	7,067,693
Liabilities:
Defined maturity	3,105,082	3,631,090
Trading Liabilities	452,611	505,581
Short-term financial liabilities:
Federal funds purchased	476,013	548,344
Securities sold under agreements to repurchase	788,595	716,925
Other short-term borrowings	4,060,673	2,253,045
Short Term Financial Liabilities	5,325,281	3,518,314
Term borrowings:
Real estate investment trust-preferred	0	0
Secured Borrowings	0	0
Junior subordinated debentures	0	0
Other long term borrowings	560,530	574,287
Total term borrowings	560,530	574,287
Derivative liabilities	42,210	24,878
Total liabilities	9,485,714	8,254,150
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Commercial, financial, and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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 (a)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	497,071	495,323
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale	4,940	5,197
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	33,321,229	31,218,152
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	785	941
Loans held-for-sale	96,800	96,015
Securities available-for-sale	23,104	19,136
Securities held-to-maturity	9,824	10,001
Derivative assets	280	0
Other assets:
Tax credit investments	249,450	244,755
Deferred compensation assets	0	0
Equity, mutual funds, and other	692,716	206,709
Total other assets	942,166	451,464
Total assets	34,394,188	31,795,709
Liabilities:
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
Short Term Financial Liabilities	0	0
Term borrowings:
Real estate investment trust-preferred	47,000	47,000
Secured Borrowings	17,315	21,975
Junior subordinated debentures	129,200	142,375
Other long term borrowings	0	0
Total term borrowings	193,515	211,350
Derivative liabilities	21,170	22,795
Total liabilities	214,685	234,145
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial, financial, and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	22,072,783	20,096,397
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	4,624,811	4,300,489
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Consumer Real Estate (a)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	6,141,872	6,334,187
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Credit Card and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, net of unearned income and allowance for loan losses	481,763	487,079
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale	13,584	14,033
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	905	947
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale	82,311	81,035
Contractual Amount
Term borrowings:
Loan commitments	10,966,768	12,355,220
Standby and other commitments	$ 455,028	$ 459,268