Fair Value of Assets & Liabilities - Summary Of Book Value And Estimated Fair Value Of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 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	$ 58,718,429	$ 30,860,804
Short-term financial assets:
Interest-bearing deposits with banks	5,443,292	482,405
Securities purchased under agreements to resell	591,987	586,629
Trading securities	1,386,069	1,346,207
Loans held for sale	1,050,504	593,790
Securities available-for-sale	7,995,872	4,445,403
Derivative Asset, Fair Value, Gross Asset	834,480	182,984
Other assets:
Total assets	83,029,579	43,310,900
Liabilities:
Trading Liabilities	477,073	505,581
Short-term financial liabilities:
Securities sold under agreements to repurchase	1,158,994	716,925
Term borrowings:
Other long term borrowings	2,161,870	791,368
Gross amounts of recognized liabilities	89,521	44,238
Total liabilities	74,885,437	38,234,892
Fair Value, Inputs, Level 3 | FHLB-Cincinnati Stock
Term borrowings:
Restricted investments	85,600	76,000
Fair Value, Inputs, Level 3 | FRB Stock
Term borrowings:
Restricted investments	205,600	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	58,718,429	30,860,804
Short-term financial assets:
Interest-bearing deposits with banks	5,443,292	482,405
Federal funds sold and securities purchased under agreements to resell	1,480	46,536
Securities purchased under agreements to resell	591,987	586,629
Total short-term financial assets	6,036,759	1,115,570
Trading securities	1,386,069	1,346,207
Loans held for sale	1,050,504	593,790
Securities available-for-sale	7,995,872	4,445,403
Securities held-to-maturity		10,000
Derivative Asset, Fair Value, Gross Asset	837,117	183,115
Other assets:
Tax credit investments	407,480	247,075
Deferred compensation assets	109,907	46,815
Equity, mutual funds, and other	315,828	229,352
Total other assets	833,215	523,242
Total assets	76,867,965	39,078,131
Liabilities:
Defined maturity	5,525,913	3,618,337
Trading Liabilities	477,073	505,581
Short-term financial liabilities:
Federal funds purchased	840,847	548,344
Securities sold under agreements to repurchase	1,158,994	716,925
Other short-term borrowings	141,878	2,253,045
Short Term Financial Liabilities	2,141,719	3,518,314
Term borrowings:
Real estate investment trust-preferred	46,287	46,236
Term borrowings—new market tax credit investment	37,881
Secured Borrowings	15,314	21,975
Junior subordinated debentures	237,475	144,593
Other long term borrowings	1,824,913	578,564
Total term borrowings	2,161,870	791,368
Gross amounts of recognized liabilities	109,448	67,480
Total liabilities	10,416,023	8,501,080
Reported Value Measurement | Commercial and industrial (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	33,166,623	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	12,302,929	4,300,905
Reported Value Measurement | Consumer 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	12,062,439	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	1,186,438	482,598
Reported Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held for sale	371,831	14,033
Reported Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held for sale	595,228	493,525
Reported Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held for sale	4,569	5,197
Reported Value Measurement | Mortgage loans- LOCOM
Short-term financial assets:
Loans held for sale	78,876	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	59,136,950	31,218,152
Short-term financial assets:
Interest-bearing deposits with banks	5,443,292	482,405
Federal funds sold and securities purchased under agreements to resell	1,480	46,536
Securities purchased under agreements to resell	591,987	586,629
Total short-term financial assets	6,036,759	1,115,570
Trading securities	1,386,069	1,346,207
Loans held for sale	1,055,553	596,535
Securities available-for-sale	7,995,872	4,445,403
Securities held-to-maturity		10,001
Derivative Asset, Fair Value, Gross Asset	837,117	183,115
Other assets:
Tax credit investments	386,901	244,755
Deferred compensation assets	109,907	46,815
Equity, mutual funds, and other	315,828	229,352
Total other assets	812,636	520,922
Total assets	77,270,933	39,435,905
Liabilities:
Defined maturity	5,602,997	3,631,090
Trading Liabilities	477,073	505,581
Short-term financial liabilities:
Federal funds purchased	840,847	548,344
Securities sold under agreements to repurchase	1,158,994	716,925
Other short-term borrowings	141,878	2,253,045
Short Term Financial Liabilities	2,141,719	3,518,314
Term borrowings:
Real estate investment trust-preferred	47,000	47,000
Term borrowings—new market tax credit investment	37,993
Secured Borrowings	15,314	21,975
Junior subordinated debentures	229,699	142,375
Other long term borrowings	1,929,827	574,287
Total term borrowings	2,259,833	785,637
Gross amounts of recognized liabilities	109,448	67,480
Total liabilities	10,591,070	8,508,102
Loan commitments	1,823	3,656
Standby and other commitments	6,119	5,513
Estimate of Fair Value Measurement | Commercial and industrial (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	33,295,053	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	12,304,261	4,300,489
Estimate of Fair Value Measurement | Consumer 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	12,327,350	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	1,210,286	487,079
Estimate of Fair Value Measurement | Mortgage loans (elected fair value)
Short-term financial assets:
Loans held for sale	371,831	14,033
Estimate of Fair Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held for sale	600,277	496,270
Estimate of Fair Value Measurement | Other consumer loans- LOCOM
Short-term financial assets:
Loans held for sale	4,569	5,197
Estimate of Fair Value Measurement | Mortgage loans- LOCOM
Short-term financial assets:
Loans held for sale	78,876	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 deposits with banks	5,443,292	482,405
Federal funds sold and securities purchased under agreements to resell	0	0
Securities purchased under agreements to resell	0	0
Total short-term financial assets	5,443,292	482,405
Trading securities	0	0
Loans held for sale	0	0
Securities available-for-sale	0	0
Securities held-to-maturity		0
Derivative Asset, Fair Value, Gross Asset	48,200	20,640
Other assets:
Tax credit investments	0	0
Deferred compensation assets	109,907	46,815
Equity, mutual funds, and other	24,712	22,643
Total other assets	134,619	69,458
Total assets	5,626,111	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
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
Gross amounts of recognized liabilities	45,051	19,807
Total liabilities	45,051	19,807
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Commercial and industrial (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 | 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
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 deposits with banks	0	0
Federal funds sold and securities purchased under agreements to resell	1,480	46,536
Securities purchased under agreements to resell	591,987	586,629
Total short-term financial assets	593,467	633,165
Trading securities	1,385,598	1,345,266
Loans held for sale	963,466	500,520
Securities available-for-sale	7,962,913	4,426,267
Securities held-to-maturity		0
Derivative Asset, Fair Value, Gross Asset	788,575	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	11,694,019	7,067,693
Liabilities:
Defined maturity	5,602,997	3,631,090
Trading Liabilities	477,073	505,581
Short-term financial liabilities:
Federal funds purchased	840,847	548,344
Securities sold under agreements to repurchase	1,158,994	716,925
Other short-term borrowings	141,878	2,253,045
Short Term Financial Liabilities	2,141,719	3,518,314
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	1,929,827	574,287
Total term borrowings	1,929,827	574,287
Gross amounts of recognized liabilities	47,257	24,878
Total liabilities	10,198,873	8,254,150
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Commercial and industrial (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 | 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
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	359,396	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	599,501	495,323
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Other consumer loans- LOCOM
Short-term financial assets:
Loans held for sale	4,569	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	59,136,950	31,218,152
Short-term financial assets:
Interest-bearing deposits with banks	0	0
Federal funds sold and securities purchased under agreements to resell	0	0
Securities purchased under agreements to resell	0	0
Total short-term financial assets	0	0
Trading securities	471	941
Loans held for sale	92,087	96,015
Securities available-for-sale	32,959	19,136
Securities held-to-maturity		10,001
Derivative Asset, Fair Value, Gross Asset	342	0
Other assets:
Tax credit investments	386,901	244,755
Deferred compensation assets	0	0
Equity, mutual funds, and other	291,116	206,709
Total other assets	678,017	451,464
Total assets	59,950,803	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
Term borrowings—new market tax credit investment	37,993
Secured Borrowings	15,314	21,975
Junior subordinated debentures	229,699	142,375
Other long term borrowings	0	0
Total term borrowings	330,006	211,350
Gross amounts of recognized liabilities	17,140	22,795
Total liabilities	347,146	234,145
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial and industrial (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	33,295,053	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	12,304,261	4,300,489
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Consumer 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	12,327,350	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	1,210,286	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	12,435	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	776	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	78,876	81,035
Contractual Amount
Term borrowings:
Loan commitments	20,627,190	12,355,220
Standby and other commitments	$ 742,278	$ 459,268