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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 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Net loans and leases | $ 61,393 | $ 61,750
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,164 | 1,538
Securities purchased under agreements to resell | 681 | 572
Trading securities | 1,376 | 1,387
Loans held for sale: | 510 | 551
Securities available for sale at fair value | 8,075 | 7,896
Securities held to maturity | 1,258 | 1,270
Derivative assets | 428 | 530
Other assets: |  |
Total assets | 81,491 | 82,152
Liabilities: |  |
Trading liabilities | 670 | 550
Short-term financial liabilities: |  |
Securities sold under agreements to repurchase | 1,760 | 2,096
Term borrowings: |  |
Other long-term borrowings | 1,691 | 1,195
Derivative liabilities | 510 | 655
Total liabilities | 72,447 | 73,041
Fair Value, Inputs, Level 3 | FHLB-Cincinnati Stock |  |
Term borrowings: |  |
Restricted investments | 66 | 51
Fair Value, Inputs, Level 3 | FRB Stock |  |
Term borrowings: |  |
Restricted investments | 203 | 203
Reported Value Measurement |  |
Assets: |  |
Net loans and leases | 61,393 | 61,750
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,164 | 1,538
Federal funds sold | 47 | 59
Securities purchased under agreements to resell | 681 | 572
Total short-term financial assets | 1,892 | 2,169
Trading securities | 1,376 | 1,387
Loans held for sale: | 510 | 551
Securities available for sale at fair value | 8,075 | 7,896
Securities held to maturity | 1,258 | 1,270
Derivative assets | 429 | 531
Other assets: |  |
Tax credit investments | 747 | 706
Deferred compensation mutual funds | 107 | 111
Equity, mutual funds, and other | 304 | 289
Total other assets | 1,158 | 1,106
Total assets | 76,091 | 76,660
Liabilities: |  |
Defined maturity deposits | 5,918 | 6,613
Trading liabilities | 670 | 550
Short-term financial liabilities: |  |
Federal funds purchased | 812 | 259
Securities sold under agreements to repurchase | 1,760 | 2,096
Other short-term borrowings | 1,223 | 1,045
Total short-term financial liabilities | 3,795 | 3,400
Term borrowings: |  |
Real estate investment trust-preferred | 47 | 47
Notes payable—new market tax credit investments | 74 | 74
Secured borrowings | 35 | 37
Junior subordinated debentures | 152 | 151
Other long-term borrowings | 1,383 | 886
Total term borrowings | 1,691 | 1,195
Derivative liabilities | 529 | 671
Total liabilities | 12,603 | 12,429
Reported Value Measurement | Commercial, financial, and industrial |  |
Assets: |  |
Net loans and leases | 33,009 | 33,083
Reported Value Measurement | Commercial Real Estate |  |
Assets: |  |
Net loans and leases | 13,914 | 14,194
Reported Value Measurement | Consumer Real Estate |  |
Assets: |  |
Net loans and leases | 13,859 | 13,826
Reported Value Measurement | Credit card and other |  |
Assets: |  |
Net loans and leases | 611 | 647
Reported Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale: | 114 | 85
Reported Value Measurement | USDA & SBA loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 372 | 439
Reported Value Measurement | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 24 | 27
Estimate of Fair Value Measurement |  |
Assets: |  |
Net loans and leases | 60,157 | 60,324
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,164 | 1,538
Federal funds sold | 47 | 59
Securities purchased under agreements to resell | 681 | 572
Total short-term financial assets | 1,892 | 2,169
Trading securities | 1,376 | 1,387
Loans held for sale: | 510 | 551
Securities available for sale at fair value | 8,075 | 7,896
Securities held to maturity | 1,092 | 1,083
Derivative assets | 429 | 531
Other assets: |  |
Tax credit investments | 715 | 692
Deferred compensation mutual funds | 107 | 111
Equity, mutual funds, and other | 304 | 289
Total other assets | 1,126 | 1,092
Total assets | 74,657 | 75,033
Liabilities: |  |
Defined maturity deposits | 5,896 | 6,591
Trading liabilities | 670 | 550
Short-term financial liabilities: |  |
Federal funds purchased | 812 | 259
Securities sold under agreements to repurchase | 1,760 | 2,096
Other short-term borrowings | 1,223 | 1,045
Total short-term financial liabilities | 3,795 | 3,400
Term borrowings: |  |
Real estate investment trust-preferred | 47 | 47
Notes payable—new market tax credit investments | 71 | 70
Secured borrowings | 35 | 37
Junior subordinated debentures | 142 | 142
Other long-term borrowings | 1,376 | 866
Total term borrowings | 1,671 | 1,162
Derivative liabilities | 529 | 671
Total liabilities | 12,561 | 12,374
Unfunded Commitments [Abstract] |  |
Loan commitments | 1 | 1
Standby and other commitments | 9 | 9
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,164 | 1,538
Federal funds sold | 0 | 0
Securities purchased under agreements to resell | 0 | 0
Total short-term financial assets | 1,164 | 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 | 5 | 8
Other assets: |  |
Tax credit investments | 0 | 0
Deferred compensation mutual funds | 107 | 111
Equity, mutual funds, and other | 35 | 35
Total other assets | 142 | 146
Total assets | 1,311 | 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 | 4 | 6
Total liabilities | 4 | 6
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Short-term financial assets: |  |
Interest-bearing deposits with banks | 0 | 0
Federal funds sold | 47 | 59
Securities purchased under agreements to resell | 681 | 572
Total short-term financial assets | 728 | 631
Trading securities | 1,354 | 1,364
Loans held for sale: | 473 | 508
Securities available for sale at fair value | 8,075 | 7,896
Securities held to maturity | 1,092 | 1,083
Derivative assets | 424 | 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 | 12,146 | 12,005
Liabilities: |  |
Defined maturity deposits | 5,896 | 6,591
Trading liabilities | 670 | 550
Short-term financial liabilities: |  |
Federal funds purchased | 812 | 259
Securities sold under agreements to repurchase | 1,760 | 2,096
Other short-term borrowings | 1,223 | 1,045
Total short-term financial liabilities | 3,795 | 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 | 1,376 | 866
Total term borrowings | 1,376 | 866
Derivative liabilities | 507 | 650
Total liabilities | 12,244 | 12,057
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |
Assets: |  |
Net loans and leases | 60,157 | 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 | 22 | 23
Loans held for sale: | 37 | 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 | 715 | 692
Deferred compensation mutual funds | 0 | 0
Equity, mutual funds, and other | 269 | 254
Total other assets | 984 | 946
Total assets | 61,200 | 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 | 71 | 70
Secured borrowings | 35 | 37
Junior subordinated debentures | 142 | 142
Other long-term borrowings | 0 | 0
Total term borrowings | 295 | 296
Derivative liabilities | 18 | 15
Total liabilities | 313 | 311
Estimate of Fair Value Measurement | Commercial, financial, and industrial |  |
Assets: |  |
Net loans and leases | 32,468 | 32,511
Estimate of Fair Value Measurement | Commercial, financial, and industrial | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial, financial, and industrial | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial, financial, and industrial | Fair Value, Inputs, Level 3 |  |
Assets: |  |
Net loans and leases | 32,468 | 32,511
Estimate of Fair Value Measurement | Commercial Real Estate |  |
Assets: |  |
Net loans and leases | 13,665 | 13,894
Estimate of Fair Value Measurement | Commercial Real Estate | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial Real Estate | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Commercial Real Estate | Fair Value, Inputs, Level 3 |  |
Assets: |  |
Net loans and leases | 13,665 | 13,894
Estimate of Fair Value Measurement | Consumer Real Estate |  |
Assets: |  |
Net loans and leases | 13,398 | 13,262
Estimate of Fair Value Measurement | Consumer Real Estate | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Consumer Real Estate | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Consumer Real Estate | Fair Value, Inputs, Level 3 |  |
Assets: |  |
Net loans and leases | 13,398 | 13,262
Estimate of Fair Value Measurement | Credit card and other |  |
Assets: |  |
Net loans and leases | 626 | 657
Estimate of Fair Value Measurement | Credit card and other | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Credit card and other | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Credit card and other | Fair Value, Inputs, Level 3 |  |
Assets: |  |
Net loans and leases | 626 | 657
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale: | 114 | 85
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: | 101 | 69
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) | Fair Value, Inputs, 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: | 372 | 439
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: | 372 | 439
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: | 24 | 27
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: | 24 | 27
Contractual Amount |  |
Unfunded Commitments [Abstract] |  |
Loan commitments | 21,158 | 20,992
Standby and other commitments | $ 709 | $ 753

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