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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 402,936 $ 349,310
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and core deposit intangibles amortization 25,372 25,802
Provision for credit losses 0 9,066
Net amortization of premium on investments 12,830 17,227
Net gain on sale of investment securities   (11,245)
Net gain on sale of other real estate and repossessed assets (333) (204)
Net gain on sale or write down of premises and equipment (1,182) (2,240)
Net accretion of discount on loans (9,271) (13,879)
Net amortization of premium on deposits (12) (133)
Net gain on sale of loans (2,905) (2,321)
Proceeds from sale of loans held for sale 115,027 103,950
Originations of loans held for sale (114,366) (102,087)
Stock based compensation expense 9,012 9,641
Decrease in accrued interest receivable and other assets 67,405 25,151
(Decrease) increase in accrued interest payable and other liabilities (33,342) 270,500
Net cash provided by operating activities 471,171 678,538
CASH FLOWS FROM INVESTING ACTIVITIES:    
Proceeds from maturities, sales and principal paydowns of held to maturity securities 1,146,197 1,411,488
Purchase of held to maturity securities (305,754) (41,999)
Proceeds from maturities, sales and principal paydowns of available for sale securities 18,030,623 18,706,454
Purchase of available for sale securities (18,021,868) (18,538,380)
Originations of Warehouse Purchase Program loans (11,905,149) (10,910,602)
Proceeds from pay-offs of Warehouse Purchase Program loans 11,707,874 10,504,141
Net decrease in loans held for investment 302,677 251,557
Purchase of bank premises and equipment (22,640) (16,317)
Proceeds from sale of bank premises, equipment and other real estate 9,315 7,227
Proceeds from insurance claims 2,319 1,423
Net cash provided by the purchase of Lone Star State Bancshares, Inc.   169,855
Net cash provided by investing activities 943,594 1,544,847
CASH FLOWS FROM FINANCING ACTIVITIES:    
Net decrease in noninterest-bearing deposits (276,410) (370,954)
Net (decrease) increase in interest-bearing deposits (322,822) 38,496
Net (repayments) proceeds from other short-term borrowings (800,000) 175,000
Net decrease in securities sold under repurchase agreements (36,116) (80,381)
Repurchase of common stock (19,950) (74,766)
Payments of cash dividends (165,609) (159,122)
Net cash used in financing activities (1,620,907) (471,727)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (206,142) 1,751,658
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 1,972,467 458,413
CASH AND CASH EQUIVALENTS, END OF PERIOD 1,766,325 2,210,071
NONCASH ACTIVITIES:    
Acquisition of real estate through foreclosure of collateral 14,858 7,031
SUPPLEMENTAL INFORMATION:    
Income taxes paid 194,904 28,397
Interest paid $ 386,408 $ 314,637