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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, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Net loans and leases | $ 62,281 | $ 61,750
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,228 | 1,538
Securities purchased under agreements to resell | 679 | 572
Trading securities | 2,070 | 1,387
Loans held for sale: | 501 | 551
Securities available for sale at fair value | 8,102 | 7,896
Securities held to maturity | 1,229 | 1,270
Derivative assets | 352 | 530
Other assets: |  |
Total assets | 83,192 | 82,152
Liabilities: |  |
Trading liabilities | 662 | 550
Short-term financial liabilities: |  |
Securities sold under agreements to repurchase | 1,866 | 2,096
Term borrowings: |  |
Other long-term borrowings | 1,328 | 1,195
Derivative liabilities | 401 | 655
Total liabilities | 73,948 | 73,041
Level 3 | FHLB-Cincinnati Stock |  |
Term borrowings: |  |
Restricted investments | 91 | 51
Level 3 | FRB Stock |  |
Term borrowings: |  |
Restricted investments | 203 | 203
Reported Value Measurement |  |
Assets: |  |
Net loans and leases | 62,281 | 61,750
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,228 | 1,538
Federal funds sold | 95 | 59
Securities purchased under agreements to resell | 679 | 572
Total short-term financial assets | 2,002 | 2,169
Trading securities | 2,070 | 1,387
Loans held for sale: | 501 | 551
Securities available for sale at fair value | 8,102 | 7,896
Securities held to maturity | 1,229 | 1,270
Derivative assets | 352 | 531
Other assets: |  |
Tax credit investments | 785 | 706
Deferred compensation mutual funds | 112 | 111
Equity, mutual funds, and other | 330 | 289
Total other assets | 1,227 | 1,106
Total assets | 77,764 | 76,660
Liabilities: |  |
Defined maturity deposits | 6,201 | 6,613
Trading liabilities | 662 | 550
Short-term financial liabilities: |  |
Federal funds purchased | 809 | 259
Securities sold under agreements to repurchase | 1,866 | 2,096
Other short-term borrowings | 1,596 | 1,045
Total short-term financial liabilities | 4,271 | 3,400
Term borrowings: |  |
Real estate investment trust-preferred | 47 | 47
Notes payable—new market tax credit investments | 81 | 74
Secured borrowings | 13 | 37
Junior subordinated debentures | 152 | 151
Other long-term borrowings | 1,035 | 886
Total term borrowings | 1,328 | 1,195
Derivative liabilities | 424 | 671
Total liabilities | 12,886 | 12,429
Reported Value Measurement | Commercial, financial, and industrial |  |
Assets: |  |
Net loans and leases | 34,067 | 33,083
Reported Value Measurement | Commercial Real Estate |  |
Assets: |  |
Net loans and leases | 13,471 | 14,194
Reported Value Measurement | Consumer Real Estate |  |
Assets: |  |
Net loans and leases | 14,184 | 13,826
Reported Value Measurement | Credit card and other |  |
Assets: |  |
Net loans and leases | 559 | 647
Reported Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale: | 139 | 85
Reported Value Measurement | USDA & SBA loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 339 | 439
Reported Value Measurement | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 23 | 27
Estimate of Fair Value Measurement |  |
Assets: |  |
Net loans and leases | 61,343 | 60,324
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,228 | 1,538
Federal funds sold | 95 | 59
Securities purchased under agreements to resell | 679 | 572
Total short-term financial assets | 2,002 | 2,169
Trading securities | 2,070 | 1,387
Loans held for sale: | 501 | 551
Securities available for sale at fair value | 8,102 | 7,896
Securities held to maturity | 1,079 | 1,083
Derivative assets | 352 | 531
Other assets: |  |
Tax credit investments | 734 | 692
Deferred compensation mutual funds | 112 | 111
Equity, mutual funds, and other | 330 | 289
Total other assets | 1,176 | 1,092
Total assets | 76,625 | 75,033
Liabilities: |  |
Defined maturity deposits | 6,184 | 6,591
Trading liabilities | 662 | 550
Short-term financial liabilities: |  |
Federal funds purchased | 809 | 259
Securities sold under agreements to repurchase | 1,866 | 2,096
Other short-term borrowings | 1,596 | 1,045
Total short-term financial liabilities | 4,271 | 3,400
Term borrowings: |  |
Real estate investment trust-preferred | 47 | 47
Notes payable—new market tax credit investments | 80 | 70
Secured borrowings | 13 | 37
Junior subordinated debentures | 142 | 142
Other long-term borrowings | 1,050 | 866
Total term borrowings | 1,332 | 1,162
Derivative liabilities | 424 | 671
Total liabilities | 12,873 | 12,374
Unfunded Commitments [Abstract] |  |
Loan commitments | 1 | 1
Standby and other commitments | 11 | 9
Estimate of Fair Value Measurement | Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,228 | 1,538
Federal funds sold | 0 | 0
Securities purchased under agreements to resell | 0 | 0
Total short-term financial assets | 1,228 | 1,538
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 | 9 | 8
Other assets: |  |
Tax credit investments | 0 | 0
Deferred compensation mutual funds | 112 | 111
Equity, mutual funds, and other | 36 | 35
Total other assets | 148 | 146
Total assets | 1,385 | 1,692
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
Notes payable—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 | 8 | 6
Total liabilities | 8 | 6
Estimate of Fair Value Measurement | Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Short-term financial assets: |  |
Interest-bearing deposits with banks | 0 | 0
Federal funds sold | 95 | 59
Securities purchased under agreements to resell | 679 | 572
Total short-term financial assets | 774 | 631
Trading securities | 2,044 | 1,364
Loans held for sale: | 465 | 508
Securities available for sale at fair value | 8,102 | 7,896
Securities held to maturity | 1,079 | 1,083
Derivative assets | 343 | 523
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 | 12,807 | 12,005
Liabilities: |  |
Defined maturity deposits | 6,184 | 6,591
Trading liabilities | 662 | 550
Short-term financial liabilities: |  |
Federal funds purchased | 809 | 259
Securities sold under agreements to repurchase | 1,866 | 2,096
Other short-term borrowings | 1,596 | 1,045
Total short-term financial liabilities | 4,271 | 3,400
Term borrowings: |  |
Real estate investment trust-preferred | 0 | 0
Notes payable—new market tax credit investments | 0 | 0
Secured borrowings | 0 | 0
Junior subordinated debentures | 0 | 0
Other long-term borrowings | 1,050 | 866
Total term borrowings | 1,050 | 866
Derivative liabilities | 394 | 650
Total liabilities | 12,561 | 12,057
Estimate of Fair Value Measurement | Level 3 |  |
Assets: |  |
Net loans and leases | 61,343 | 60,324
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 | 26 | 23
Loans held for sale: | 36 | 43
Securities available for sale at fair value | 0 | 0
Securities held to maturity | 0 | 0
Derivative assets | 0 | 0
Other assets: |  |
Tax credit investments | 734 | 692
Deferred compensation mutual funds | 0 | 0
Equity, mutual funds, and other | 294 | 254
Total other assets | 1,028 | 946
Total assets | 62,433 | 61,336
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
Notes payable—new market tax credit investments | 80 | 70
Secured borrowings | 13 | 37
Junior subordinated debentures | 142 | 142
Other long-term borrowings | 0 | 0
Total term borrowings | 282 | 296
Derivative liabilities | 22 | 15
Total liabilities | 304 | 311
Estimate of Fair Value Measurement | Commercial, financial, and industrial |  |
Assets: |  |
Net loans and leases | 33,590 | 32,511
Estimate of Fair Value Measurement | Commercial, financial, and industrial | Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial, financial, and industrial | Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial, financial, and industrial | Level 3 |  |
Assets: |  |
Net loans and leases | 33,590 | 32,511
Estimate of Fair Value Measurement | Commercial Real Estate |  |
Assets: |  |
Net loans and leases | 13,409 | 13,894
Estimate of Fair Value Measurement | Commercial Real Estate | Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial Real Estate | Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial Real Estate | Level 3 |  |
Assets: |  |
Net loans and leases | 13,409 | 13,894
Estimate of Fair Value Measurement | Consumer Real Estate |  |
Assets: |  |
Net loans and leases | 13,766 | 13,262
Estimate of Fair Value Measurement | Consumer Real Estate | Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Consumer Real Estate | Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Consumer Real Estate | Level 3 |  |
Assets: |  |
Net loans and leases | 13,766 | 13,262
Estimate of Fair Value Measurement | Credit card and other |  |
Assets: |  |
Net loans and leases | 578 | 657
Estimate of Fair Value Measurement | Credit card and other | Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Credit card and other | Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Credit card and other | Level 3 |  |
Assets: |  |
Net loans and leases | 578 | 657
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale: | 139 | 85
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) | Level 1 |  |
Short-term financial assets: |  |
Loans held for sale: | 0 | 0
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) | Level 2 |  |
Short-term financial assets: |  |
Loans held for sale: | 126 | 69
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) | Level 3 |  |
Short-term financial assets: |  |
Loans held for sale: | 13 | 16
Estimate of Fair Value Measurement | USDA & SBA loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 339 | 439
Estimate of Fair Value Measurement | USDA & SBA loans - LOCOM | Level 1 |  |
Short-term financial assets: |  |
Loans held for sale: | 0 | 0
Estimate of Fair Value Measurement | USDA & SBA loans - LOCOM | Level 2 |  |
Short-term financial assets: |  |
Loans held for sale: | 339 | 439
Estimate of Fair Value Measurement | USDA & SBA loans - LOCOM | 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: | 23 | 27
Estimate of Fair Value Measurement | Mortgage loans - LOCOM | Level 1 |  |
Short-term financial assets: |  |
Loans held for sale: | 0 | 0
Estimate of Fair Value Measurement | Mortgage loans - LOCOM | Level 2 |  |
Short-term financial assets: |  |
Loans held for sale: | 0 | 0
Estimate of Fair Value Measurement | Mortgage loans - LOCOM | Level 3 |  |
Short-term financial assets: |  |
Loans held for sale: | 23 | 27
Contractual Amount |  |
Unfunded Commitments [Abstract] |  |
Loan commitments | 21,551 | 20,992
Standby and other commitments | $ 788 | $ 753

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