Fair Value of Assets & Liabilities - Summary Of Book Value And Estimated Fair Value Of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 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	$ 32,171,056	$ 30,860,804
Short-term financial assets:
Interest-bearing cash	3,135,844	482,405
Federal funds sold	113,000	46,536
Securities purchased under agreements to resell	302,267	586,629
Trading securities	1,116,450	1,346,207
Securities available-for-sale	5,476,156	4,445,403
Securities held-to-maturity	10,000	10,000
Derivative assets	599,445	182,984
Other assets:
Total assets	48,644,659	43,310,900
Liabilities:
Trading Liabilities	232,742	505,581
Short-term financial liabilities:
Federal funds purchased	778,529	548,344
Securities sold under agreements to repurchase	1,482,585	716,925
Other short-term borrowings	130,583	2,253,045
Term borrowings:
Other long term borrowings	2,032,476	791,368
Derivative liabilities	75,226	44,238
Total liabilities	43,436,274	38,234,892
Fair Value, Inputs, Level 3 | FHLB-Cincinnati Stock
Term borrowings:
Restricted investments	190,400	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	32,171,056	30,860,804
Short-term financial assets:
Interest-bearing cash	3,135,844	482,405
Federal funds sold	113,000	46,536
Securities purchased under agreements to resell	302,267	586,629
Total short-term financial assets	3,551,111	1,115,570
Trading securities	1,116,450	1,346,207
Loans held-for-sale	745,655	593,790
Securities available-for-sale	5,476,156	4,445,403
Securities held-to-maturity	10,000	10,000
Derivative assets	599,704	183,115
Other assets:
Tax credit investments	257,547	247,075
Deferred compensation assets	48,572	46,815
Equity, mutual funds, and other	343,825	229,352
Total other assets	649,944	523,242
Total assets	44,320,076	39,078,131
Liabilities:
Defined maturity	2,655,702	3,618,337
Trading Liabilities	232,742	505,581
Short-term financial liabilities:
Federal funds purchased	778,529	548,344
Securities sold under agreements to repurchase	1,482,585	716,925
Other short-term borrowings	130,583	2,253,045
Short Term Financial Liabilities	2,391,697	3,518,314
Term borrowings:
Real estate investment trust-preferred	46,270	46,236
Secured Borrowings	15,370	21,975
Junior subordinated debentures	145,262	144,593
Other long term borrowings	1,825,574	578,564
Total term borrowings	2,032,476	791,368
Derivative liabilities	94,389	67,480
Total liabilities	7,407,006	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	21,075,171	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	4,756,056	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	5,908,636	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	431,193	482,598
Reported Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale	13,263	14,033
Reported Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	644,219	493,525
Reported Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale	4,758	5,197
Reported Value Measurement | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale	83,415	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	32,508,563	31,218,152
Short-term financial assets:
Interest-bearing cash	3,135,844	482,405
Federal funds sold	113,000	46,536
Securities purchased under agreements to resell	302,267	586,629
Total short-term financial assets	3,551,111	1,115,570
Trading securities	1,116,450	1,346,207
Loans held-for-sale	750,611	596,535
Securities available-for-sale	5,476,156	4,445,403
Securities held-to-maturity	9,881	10,001
Derivative assets	599,704	183,115
Other assets:
Tax credit investments	257,705	244,755
Deferred compensation assets	48,572	46,815
Equity, mutual funds, and other	343,825	229,352
Total other assets	650,102	520,922
Total assets	44,662,578	39,435,905
Liabilities:
Defined maturity	2,695,759	3,631,090
Trading Liabilities	232,742	505,581
Short-term financial liabilities:
Federal funds purchased	778,529	548,344
Securities sold under agreements to repurchase	1,482,585	716,925
Other short-term borrowings	130,583	2,253,045
Short Term Financial Liabilities	2,391,697	3,518,314
Term borrowings:
Real estate investment trust-preferred	47,000	47,000
Secured Borrowings	15,370	21,975
Junior subordinated debentures	138,950	142,375
Other long term borrowings	1,877,080	574,287
Total term borrowings	2,078,400	785,637
Derivative liabilities	94,389	67,480
Total liabilities	7,492,987	8,508,102
Loan commitments	2,492	3,656
Standby and other commitments	6,112	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	21,216,054	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	4,768,706	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	6,085,159	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	438,644	487,079
Estimate of Fair Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held-for-sale	13,263	14,033
Estimate of Fair Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	649,175	496,270
Estimate of Fair Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale	4,758	5,197
Estimate of Fair Value Measurement | Mortgage loans- LOCOM
Short-term financial assets:
Loans held-for-sale	83,415	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	3,135,844	482,405
Federal funds sold	0	0
Securities purchased under agreements to resell	0	0
Total short-term financial assets	3,135,844	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	35,408	20,640
Other assets:
Tax credit investments	0	0
Deferred compensation assets	48,572	46,815
Equity, mutual funds, and other	22,692	22,643
Total other assets	71,264	69,458
Total assets	3,242,516	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	30,483	19,807
Total liabilities	30,483	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	113,000	46,536
Securities purchased under agreements to resell	302,267	586,629
Total short-term financial assets	415,267	633,165
Trading securities	1,115,822	1,345,266
Loans held-for-sale	653,141	500,520
Securities available-for-sale	5,450,710	4,426,267
Securities held-to-maturity	0	0
Derivative assets	564,126	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	8,199,066	7,067,693
Liabilities:
Defined maturity	2,695,759	3,631,090
Trading Liabilities	232,742	505,581
Short-term financial liabilities:
Federal funds purchased	778,529	548,344
Securities sold under agreements to repurchase	1,482,585	716,925
Other short-term borrowings	130,583	2,253,045
Short Term Financial Liabilities	2,391,697	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	1,877,080	574,287
Total term borrowings	1,877,080	574,287
Derivative liabilities	45,091	24,878
Total liabilities	7,242,369	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	648,383	495,323
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held-for-sale	4,758	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	32,508,563	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	628	941
Loans held-for-sale	97,470	96,015
Securities available-for-sale	25,446	19,136
Securities held-to-maturity	9,881	10,001
Derivative assets	170	0
Other assets:
Tax credit investments	257,705	244,755
Deferred compensation assets	0	0
Equity, mutual funds, and other	321,133	206,709
Total other assets	578,838	451,464
Total assets	33,220,996	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	15,370	21,975
Junior subordinated debentures	138,950	142,375
Other long term borrowings	0	0
Total term borrowings	201,320	211,350
Derivative liabilities	18,815	22,795
Total liabilities	220,135	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	21,216,054	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	4,768,706	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	6,085,159	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	438,644	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	13,263	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	792	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	83,415	81,035
Contractual Amount
Term borrowings:
Loan commitments	12,945,839	12,355,220
Standby and other commitments	$ 469,567	$ 459,268