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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 $ 452,634 $ 385,315
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation 32,115 28,449
Amortization of other intangible assets 52,644 20,291
Amortization of tax credit investments 16,296 8,773
Net (discount accretion) premium amortization (95,091) (19,881)
Share-based compensation expense 30,760 23,256
Provision for credit losses 164,976 83,602
Debt securities (gains) losses, net 110 90
Net (gains) losses on sales of loans and other assets (9,585) (7,084)
Increase in cash surrender value of company-owned life insurance (19,571) (14,488)
Residential real estate loans originated for sale (865,826) (632,726)
Proceeds from sales of residential real estate loans 838,225 615,624
(Increase) decrease in interest receivable (50,927) 11,447
(Increase) decrease in other assets 128,383 (38,458)
Increase (decrease) in accrued expenses and other liabilities (152,855) (77,681)
Net cash flows provided by (used in) operating activities 522,288 386,529
Cash Flows From Investing Activities    
Cash received from merger, net 135,124 177,791
Purchases of investment securities available-for-sale (4,077,327) (1,263,354)
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock (93,325) (13,129)
Purchases of equity securities (6,923) (5,462)
Proceeds from maturities, prepayments, and calls of investment securities available-for-sale 1,149,256 755,417
Proceeds from sales of investment securities available-for-sale 2,082,052 297,858
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity 54,213 55,069
Proceeds from sales of Federal Home Loan Bank/Federal Reserve Bank stock 71,234 14,426
Proceeds from sales of equity securities 4,636 2,755
Loan originations and payments, net (546,956) (1,327,734)
Proceeds from sales of commercial loans 95,298 63,434
Proceeds from company-owned life insurance death benefits 16,507 10,212
Proceeds from sales of premises and equipment and other assets 2,368 1,585
Purchases of premises and equipment and other assets (22,189) (23,513)
Net cash flows provided by (used in) investing activities (1,136,032) (1,254,645)
Net increase (decrease) in:    
Deposits 1,320,267 1,050,442
Federal funds purchased and interbank borrowings (384) 134,873
Securities sold under agreements to repurchase (40,512) (40,580)
Other borrowings (72,730) (209,675)
Payments for maturities of Federal Home Loan Bank advances (2,295,285) (1,300,000)
Proceeds from Federal Home Loan Bank advances 1,926,200 1,400,000
Cash dividends paid (166,472) (142,471)
Common stock repurchased (46,698) (8,745)
Common stock issued for ESPP 771 784
Common stock issued for forward sale agreements 443,236 0
Net cash flows provided by (used in) financing activities 1,068,393 884,628
Net increase (decrease) in cash and cash equivalents 454,649 16,512
Cash and cash equivalents at beginning of period 1,227,968 1,175,058
Cash and cash equivalents at end of period 1,682,617 1,191,570
Supplemental Cash Flow Information:    
Total interest paid 925,019 797,929
Total income taxes paid (net of refunds) 54,159 54,904
Noncash Investing and Financing Activities:    
Common stock issued for merger, net 1,033,262 417,598
Operating lease right-of-use assets obtained in exchange for lease obligations 55,398 22,367
Finance lease right-of-use assets obtained in exchange for lease obligations $ 7,728 $ 16,703