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Condensed Parent Company Financial Statements - Schedule of Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Operating Activities:      
Net income $ 823,844 $ 695,045 $ 622,626
Adjustments to reconcile net income to net cash provided by operating activities      
(Losses) gains on available-for-sale debt securities and equity securities with readily determinable fair value, net (8,323) 2,602 (1,525)
Depreciation and amortization 118,778 100,079 84,764
Deferred income tax benefit (expense) 44,841 11,011 (19,707)
Stock-based compensation expense 41,551 38,108 33,495
Decrease (increase) in other assets (68,987) (131,429) (205,428)
Increase (decrease) in other liabilities (57,673) (49,348) 164,606
Net Cash Provided by Operating Activities 910,348 721,557 744,376
Investing Activities:      
Net cash paid in business combination 0 531,308 (5,147)
Net Cash Used for Investing Activities (6,168,623) (5,946,363) (3,237,816)
Financing Activities:      
Decrease in other borrowings and junior subordinated debentures, net (73,607) (83,674) 40,670
Repayment of subordinated note 0 (140,000) 0
Proceeds from issuance of Series F Preferred Stock, net 414,148 0 0
Redemption of Series D and Series E Preferred Stock, net (412,500) 0 0
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and director compensation plan 7,220 6,694 8,309
Dividends paid (169,423) (143,280) (125,690)
Common stock repurchases for tax withholdings related to stock-based compensation (3,003) (3,936) (1,913)
Net Cash Provided by Financing Activities 5,267,677 5,259,878 2,425,938
Net Increase (Decrease) in Cash and Cash Equivalents 9,402 35,072 (67,502)
Cash and Cash Equivalents at Beginning of Period 458,536 423,464 490,966
Cash and Cash Equivalents at End of Period 467,938 458,536 423,464
Reportable Legal Entities | Parent Company      
Operating Activities:      
Net income 823,844 695,045 622,626
Adjustments to reconcile net income to net cash provided by operating activities      
(Losses) gains on available-for-sale debt securities and equity securities with readily determinable fair value, net (2,442) 913 (442)
Depreciation and amortization 38,933 35,627 25,840
Deferred income tax benefit (expense) 6,203 (9,449) (6,176)
Stock-based compensation expense 17,772 16,401 14,154
Decrease (increase) in other assets 21,987 (3,862) (3,978)
Increase (decrease) in other liabilities 12,892 8,802 (6,059)
Equity in undistributed net income of subsidiaries (488,688) (460,196) (473,735)
Net Cash Provided by Operating Activities 430,501 283,281 172,230
Investing Activities:      
Net cash paid in business combination 0 (38) 0
Other investing activity, net (39,546) (37,764) (25,965)
Net Cash Used for Investing Activities (39,546) (37,802) (25,965)
Financing Activities:      
Decrease in other borrowings and junior subordinated debentures, net (142,845) (30,668) (30,641)
Repayment of subordinated note 0 (140,000) 0
Proceeds from issuance of Series F Preferred Stock, net 414,148 0 0
Redemption of Series D and Series E Preferred Stock, net (412,500) 0 0
Issuance of common shares resulting from exercise of stock options, employee stock purchase plan and director compensation plan 7,220 6,694 8,309
Dividends paid (169,423) (143,280) (125,690)
Common stock repurchases for tax withholdings related to stock-based compensation (3,003) (3,936) (1,913)
Net Cash Provided by Financing Activities (306,403) (311,190) (149,935)
Net Increase (Decrease) in Cash and Cash Equivalents 84,552 (65,711) (3,670)
Cash and Cash Equivalents at Beginning of Period 196,969 262,680 266,350
Cash and Cash Equivalents at End of Period $ 281,521 $ 196,969 $ 262,680