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Fair Value of Assets and Liabilities - Schedule of Book Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | $ 61,622 | $ 60,519
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,286 | 1,328
Securities purchased under agreements to resell | 796 | 519
Trading securities | 1,549 | 1,412
Loans held for sale: | 494 | 502
Securities available for sale at fair value | 8,248 | 8,391
Securities held to maturity | 1,282 | 1,323
Derivative assets | 437 | 576
Other assets: |  |
Total assets | 82,635 | 81,661
Liabilities: |  |
Trading liabilities | 767 | 509
Short-term financial liabilities: |  |
Securities sold under agreements to repurchase | 1,611 | 1,921
Term borrowings: |  |
Other long-term borrowings | 1,202 | 1,150
Derivative liabilities | 488 | 675
Total liabilities | 73,319 | 72,370
Fair Value, Inputs, Level 3 | FHLB-Cincinnati Stock |  |
Term borrowings: |  |
Restricted investments | 47 | 24
Fair Value, Inputs, Level 3 | FRB Stock |  |
Term borrowings: |  |
Restricted investments | 203 | 203
Reported Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 61,622 | 60,519
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,286 | 1,328
Federal funds sold | 212 | 200
Securities purchased under agreements to resell | 796 | 519
Total short-term financial assets | 2,294 | 2,047
Trading securities | 1,549 | 1,412
Loans held for sale: | 494 | 502
Securities available for sale at fair value | 8,248 | 8,391
Securities held to maturity | 1,282 | 1,323
Derivative assets | 437 | 577
Other assets: |  |
Tax credit investments | 690 | 665
Deferred compensation mutual funds | 110 | 102
Equity, mutual funds, and other | 285 | 261
Total other assets | 1,085 | 1,028
Total assets | 77,011 | 75,799
Liabilities: |  |
Defined maturity deposits | 8,326 | 6,804
Trading liabilities | 767 | 509
Short-term financial liabilities: |  |
Federal funds purchased | 300 | 302
Securities sold under agreements to repurchase | 1,610 | 1,921
Other short-term borrowings | 675 | 326
Total short-term financial liabilities | 2,585 | 2,549
Term borrowings: |  |
Real estate investment trust-preferred | 47 | 47
Term borrowings—new market tax credit investments | 83 | 65
Secured borrowings | 35 | 3
Junior subordinated debentures | 151 | 150
Other long-term borrowings | 886 | 885
Total term borrowings | 1,202 | 1,150
Derivative liabilities | 521 | 699
Total liabilities | 13,401 | 11,711
Reported Value Measurement | Commercial, financial and industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 32,740 | 32,294
Reported Value Measurement | Commercial Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 14,487 | 14,044
Reported Value Measurement | Consumer Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 13,731 | 13,417
Reported Value Measurement | Credit card and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 664 | 764
Reported Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale: | 87 | 68
Reported Value Measurement | USDA & SBA loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 379 | 406
Reported Value Measurement | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 28 | 28
Estimate of Fair Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 60,549 | 58,851
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,286 | 1,328
Federal funds sold | 212 | 200
Securities purchased under agreements to resell | 796 | 519
Total short-term financial assets | 2,294 | 2,047
Trading securities | 1,549 | 1,412
Loans held for sale: | 495 | 503
Securities available for sale at fair value | 8,248 | 8,391
Securities held to maturity | 1,144 | 1,161
Derivative assets | 437 | 577
Other assets: |  |
Tax credit investments | 668 | 653
Deferred compensation mutual funds | 110 | 102
Equity, mutual funds, and other | 285 | 261
Total other assets | 1,063 | 1,016
Total assets | 75,779 | 73,958
Liabilities: |  |
Defined maturity deposits | 8,319 | 6,851
Trading liabilities | 767 | 509
Short-term financial liabilities: |  |
Federal funds purchased | 300 | 302
Securities sold under agreements to repurchase | 1,610 | 1,921
Other short-term borrowings | 675 | 326
Total short-term financial liabilities | 2,585 | 2,549
Term borrowings: |  |
Real estate investment trust-preferred | 47 | 47
Term borrowings—new market tax credit investments | 81 | 60
Secured borrowings | 35 | 3
Junior subordinated debentures | 150 | 150
Other long-term borrowings | 879 | 824
Total term borrowings | 1,192 | 1,084
Derivative liabilities | 521 | 699
Total liabilities | 13,384 | 11,692
Unfunded Commitments [Abstract] |  |
Loan commitments | 1 | 1
Standby and other commitments | 8 | 8
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,286 | 1,328
Federal funds sold | 0 | 0
Securities purchased under agreements to resell | 0 | 0
Total short-term financial assets | 1,286 | 1,328
Trading securities | 0 | 0
Loans held for sale: | 0 | 0
Securities available for sale at fair value | 0 | 0
Securities held to maturity | 0 | 0
Derivative assets | 6 | 9
Other assets: |  |
Tax credit investments | 0 | 0
Deferred compensation mutual funds | 110 | 102
Equity, mutual funds, and other | 35 | 34
Total other assets | 145 | 136
Total assets | 1,437 | 1,473
Liabilities: |  |
Defined maturity 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 investments | 0 | 0
Secured borrowings | 0 | 0
Junior subordinated debentures | 0 | 0
Other long-term borrowings | 0 | 0
Total term borrowings | 0 | 0
Derivative liabilities | 5 | 10
Total liabilities | 5 | 10
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Short-term financial assets: |  |
Interest-bearing deposits with banks | 0 | 0
Federal funds sold | 212 | 200
Securities purchased under agreements to resell | 796 | 519
Total short-term financial assets | 1,008 | 719
Trading securities | 1,532 | 1,399
Loans held for sale: | 451 | 449
Securities available for sale at fair value | 8,248 | 8,391
Securities held to maturity | 1,144 | 1,161
Derivative assets | 431 | 568
Other assets: |  |
Tax credit investments | 0 | 0
Deferred compensation mutual funds | 0 | 0
Equity, mutual funds, and other | 0 | 0
Total other assets | 0 | 0
Total assets | 12,814 | 12,687
Liabilities: |  |
Defined maturity deposits | 8,319 | 6,851
Trading liabilities | 767 | 509
Short-term financial liabilities: |  |
Federal funds purchased | 300 | 302
Securities sold under agreements to repurchase | 1,610 | 1,921
Other short-term borrowings | 675 | 326
Total short-term financial liabilities | 2,585 | 2,549
Term borrowings: |  |
Real estate investment trust-preferred | 0 | 0
Term borrowings—new market tax credit investments | 0 | 0
Secured borrowings | 0 | 0
Junior subordinated debentures | 0 | 0
Other long-term borrowings | 879 | 824
Total term borrowings | 879 | 824
Derivative liabilities | 484 | 666
Total liabilities | 13,034 | 11,399
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 60,549 | 58,851
Short-term financial assets: |  |
Interest-bearing deposits with banks | 0 | 0
Federal funds sold | 0 | 0
Securities purchased under agreements to resell | 0 | 0
Total short-term financial assets | 0 | 0
Trading securities | 17 | 13
Loans held for sale: | 44 | 54
Securities available for sale at fair value | 0 | 0
Securities held to maturity | 0 | 0
Derivative assets | 0 | 0
Other assets: |  |
Tax credit investments | 668 | 653
Deferred compensation mutual funds | 0 | 0
Equity, mutual funds, and other | 250 | 227
Total other assets | 918 | 880
Total assets | 61,528 | 59,798
Liabilities: |  |
Defined maturity 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 | 47 | 47
Term borrowings—new market tax credit investments | 81 | 60
Secured borrowings | 35 | 3
Junior subordinated debentures | 150 | 150
Other long-term borrowings | 0 | 0
Total term borrowings | 313 | 260
Derivative liabilities | 32 | 23
Total liabilities | 345 | 283
Estimate of Fair Value Measurement | Commercial, financial and industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 32,231 | 31,673
Estimate of Fair Value Measurement | Commercial, financial and industrial | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial, financial and industrial | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial, financial and industrial | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 32,231 | 31,673
Estimate of Fair Value Measurement | Commercial Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 14,262 | 13,831
Estimate of Fair Value Measurement | Commercial Real Estate | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial Real Estate | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial Real Estate | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 14,262 | 13,831
Estimate of Fair Value Measurement | Consumer Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 13,374 | 12,605
Estimate of Fair Value Measurement | Consumer Real Estate | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Consumer Real Estate | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Consumer Real Estate | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 13,374 | 12,605
Estimate of Fair Value Measurement | Credit card and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 682 | 742
Estimate of Fair Value Measurement | Credit card and other | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Credit card and other | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Credit card and other | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 682 | 742
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale: | 87 | 68
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) | Fair Value, Inputs, Level 1 |  |
Short-term financial assets: |  |
Loans held for sale: | 0 | 0
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) | Fair Value, Inputs, Level 2 |  |
Short-term financial assets: |  |
Loans held for sale: | 71 | 42
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) | Fair Value, Inputs, Level 3 |  |
Short-term financial assets: |  |
Loans held for sale: | 16 | 26
Estimate of Fair Value Measurement | USDA & SBA loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 380 | 407
Estimate of Fair Value Measurement | USDA & SBA loans - LOCOM | Fair Value, Inputs, Level 1 |  |
Short-term financial assets: |  |
Loans held for sale: | 0 | 0
Estimate of Fair Value Measurement | USDA & SBA loans - LOCOM | Fair Value, Inputs, Level 2 |  |
Short-term financial assets: |  |
Loans held for sale: | 380 | 407
Estimate of Fair Value Measurement | USDA & SBA loans - LOCOM | Fair Value, Inputs, Level 3 |  |
Short-term financial assets: |  |
Loans held for sale: | 0 | 0
Estimate of Fair Value Measurement | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 28 | 28
Estimate of Fair Value Measurement | Mortgage loans - LOCOM | Fair Value, Inputs, Level 1 |  |
Short-term financial assets: |  |
Loans held for sale: | 0 | 0
Estimate of Fair Value Measurement | Mortgage loans - LOCOM | Fair Value, Inputs, Level 2 |  |
Short-term financial assets: |  |
Loans held for sale: | 0 | 0
Estimate of Fair Value Measurement | Mortgage loans - LOCOM | Fair Value, Inputs, Level 3 |  |
Short-term financial assets: |  |
Loans held for sale: | 28 | 28
Contractual Amount |  |
Unfunded Commitments [Abstract] |  |
Loan commitments | 21,379 | 24,579
Standby and other commitments | $ 737 | $ 746

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