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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net income $ 523,888,000 $ 387,942,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for credit losses 141,759,000 113,022,000
Amortization of intangibles 768,000 982,000
Depreciation and amortization of premises and equipment 27,946,000 25,319,000
Net accretion of discounts and amortization of premiums and deferred fees (129,129,000) (136,208,000)
Interest capitalized on loans subject to the temporary payment moratorium or loss mitigation alternatives (2,746,000) (2,822,000)
Share-based compensation 22,803,000 21,930,000
Net loss, including impairment on debt securities 595,000 0
Fair value adjustments on mortgage servicing rights 2,871,000 5,523,000
Adjustments to indemnity reserves on loans sold (429,000) (293,000)
Earnings from investments under the equity method, net of dividends or distributions (10,099,000) 152,000
Deferred income tax expense 17,643,000 20,832,000
Gain on:    
Disposition of premises and equipment and other productive assets (171,000) (91,000)
Sale of loans, including valuation adjustments on loans held-for-sale and mortgage banking activities (477,000) (156,000)
Sale of equity method investment 0 (1,226,000)
Sale of foreclosed assets, including write-downs (6,210,000) (5,076,000)
Acquisitions of loans held-for-sale (6,603,000) (2,332,000)
Proceeds from sale of loans held-for-sale 23,081,000 15,584,000
Net originations on loans held-for-sale (23,540,000) (12,137,000)
Net decrease (increase) in:    
Trading debt securities 26,802,000 10,040,000
Equity securities (5,696,000) (1,411,000)
Accrued income receivable (6,496,000) (11,419,000)
Other assets (5,018,000) (19,371,000)
Net increase (decrease) in:    
Interest payable 4,240,000 2,584,000
Pension and other postretirement benefits obligation 589,000 2,191,000
Other liabilities (57,608,000) 1,434,000
Total adjustments 14,875,000 27,051,000
Net cash provided by operating activities 538,763,000 414,993,000
Cash flows from investing activities:    
Net decrease in money market investments 70,764,000 40,765,000
Purchases of investment securities:    
Available-for-sale (22,651,691,000) (18,905,199,000)
Equity (29,545,000) (25,811,000)
Proceeds from calls, paydowns, maturities and redemptions of investment securities:    
Available-for-sale 17,883,623,000 17,145,332,000
Held-to-maturity 1,209,735,000 303,212,000
Proceeds from sale of investment securities:    
Equity 28,415,000 14,497,000
Net disbursements on loans (585,608,000) (912,037,000)
Proceeds from sale of loans 184,640,000 40,983,000
Acquisition of loan portfolios (294,609,000) (319,297,000)
Return of capital from equity method investments 1,000 0
Net proceeds from sale of equity method investment 0 1,226,000
Payments to acquire equity method investments (1,379,000) 0
Acquisition of premises and equipment and other productive assets (93,787,000) (96,200,000)
Proceeds from sale of:    
Premises and equipment and other productive assets 756,000 344,000
Foreclosed assets 35,517,000 47,590,000
Net cash used in investing activities (4,243,168,000) (2,664,595,000)
Net increase in:    
Deposits 4,043,188,000 2,334,656,000
Assets sold under agreements to repurchase 38,520,000 1,210,000
Other short-term borrowings 25,000,000 325,000,000
Payments of notes payable (50,000,000) (88,522,000)
Principal payments of finance leases (2,800,000) (1,829,000)
Proceeds from issuances of common stock 3,627,000 3,530,000
Dividends paid (98,967,000) (98,661,000)
Net payments for repurchase of common stock (283,100,000) (236,203,000)
Payments related to tax withholding for share-based compensation (9,058,000) (7,983,000)
Net cash provided by financing activities 3,666,410,000 2,231,198,000
Net decrease in cash and due from banks, and restricted cash (37,995,000) (18,404,000)
Cash and due from banks, and restricted cash at beginning of period 412,989,000 429,406,000
Cash and due from banks, and restricted cash at the end of the period $ 374,994,000 $ 411,002,000