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Parent Company Condensed Financial Statements - Schedule of Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Statement of cash flows |  |  |
Net income | $ 1,325,188 | $ 1,165,586 | $ 1,161,161
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred income tax expense | (7,775) | (14,283) | (49,139)
Net change in other assets | (97,306) | 63,743 | (146,270)
Net change in other liabilities | (167,970) | (242,443) | 105,304
Other operating activities, net | (9,099) | 1,846 | 11,508
Net cash provided by operating activities | 1,501,700 | 1,411,667 | 1,424,909
AFS debt securities: |  |  |
Proceeds from maturities | 3,851,138 | 1,547,058 | 1,470,819
Purchases | (6,939,256) | (7,599,454) | (1,549,846)
Other investing activities, net | 4,527 | 8,894 | (88,262)
Net cash used in investing activities | (5,476,505) | (6,295,203) | (4,247,161)
Long-term debt: |  |  |
Repayment of junior subordinated debt | (836) | (117,437) | (871)
Common stock: |  |  |
Proceeds from issuance pursuant to various stock compensation plans and agreements | 3,212 | 3,023 | 3,208
Stock tendered for payment of withholding taxes | (19,239) | (14,877) | (23,751)
Repurchase of common stock pursuant to the stock repurchase program | (115,590) | (143,082) | (82,174)
Cash dividends paid | (334,041) | (308,478) | (274,554)
Net cash provided by financing activities | 2,897,225 | 5,527,526 | 3,962,454
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (1,062,603) | 635,758 | 1,133,200
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 5,250,742 | 4,614,984 | 3,481,784
CASH AND CASH EQUIVALENTS, END OF YEAR | 4,188,139 | 5,250,742 | 4,614,984
Parent Company |  |  |
Statement of cash flows |  |  |
Net income | 1,325,188 | 1,165,586 | 1,161,161
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Undistributed earnings of subsidiaries, principally bank | (584,292) | (635,868) | (470,740)
Deferred income tax expense | 62 | 2,788 | 948
Net change in other assets | (5,549) | (6,912) | (4,160)
Net change in other liabilities | (1,686) | (802) | (47)
Other operating activities, net | 1,083 | 1,265 | 2,443
Net cash provided by operating activities | 734,806 | 526,057 | 689,605
AFS debt securities: |  |  |
Proceeds from maturities | 1,945,000 | 0 | 0
Purchases | (1,944,333) | 0 | 0
Redemption of trust preferred securities | 0 | 3,558 | 0
Other investing activities, net | (732) | (494) | (95,095)
Net cash used in investing activities | (65) | 3,064 | (95,095)
Long-term debt: |  |  |
Repayment of junior subordinated debt | 0 | (116,558) | 0
Common stock: |  |  |
Proceeds from issuance pursuant to various stock compensation plans and agreements | 3,212 | 3,023 | 3,208
Stock tendered for payment of withholding taxes | (19,239) | (14,877) | (23,751)
Repurchase of common stock pursuant to the stock repurchase program | (115,590) | (143,082) | (82,174)
Cash dividends paid | (334,041) | (308,478) | (274,554)
Net cash provided by financing activities | (465,658) | (579,972) | (377,271)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | 269,083 | (50,851) | 217,239
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR | 394,919 | 445,770 | 228,531
CASH AND CASH EQUIVALENTS, END OF YEAR | $ 664,002 | $ 394,919 | $ 445,770

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