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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash Flows From Operating Activities      
Net income $ 669,257 $ 539,188 $ 581,992
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation 44,943 38,104 38,180
Amortization of other intangible assets 78,660 27,528 24,155
Amortization of tax credit investments 26,118 13,329 15,367
Net (discount accretion) premium amortization (140,610) (33,073) (14,775)
Share-based compensation expense 38,214 32,283 27,910
Provision for credit losses 197,721 110,619 58,887
Debt securities (gains) losses, net 37 212 6,265
Gain on sale of Visa Class B restricted shares 0 0 (21,635)
Net (gains) losses on sales of loans and other assets (11,271) (7,778) (3,074)
Increase in cash surrender value of company-owned life insurance (26,670) (20,987) (15,397)
Residential real estate loans originated for sale (1,217,430) (889,812) (473,478)
Proceeds from sales of residential real estate loans 1,221,488 902,873 472,537
(Increase) decrease in interest receivable (61,389) 4,062 (34,637)
(Increase) decrease in other assets 33,250 (54,023) (66,070)
Increase (decrease) in accrued expenses and other liabilities (170,846) (40,241) (79,885)
Net cash flows provided by (used in) operating activities 681,472 622,284 516,342
Cash Flows From Investing Activities      
Cash received from merger, net 135,124 177,791 0
Purchases of investment securities available-for-sale (4,636,828) (1,842,045) (1,084,416)
Purchases of investment securities held-to-maturity 0 0 (1,941)
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock (93,327) (13,129) (99,158)
Purchases of equity securities (7,723) (7,244) (28,408)
Proceeds from maturities, prepayments, and calls of investment securities    available-for-sale 1,796,946 1,081,567 1,066,266
Proceeds from sales of investment securities available-for-sale 2,082,053 300,617 96,506
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity 71,937 72,916 94,511
Proceeds from sales of Federal Home Loan Bank/Federal Reserve Bank stock 72,373 14,438 47,738
Proceeds from sales of equity securities 6,004 3,080 24,636
Loan originations and payments, net (1,332,344) (1,215,292) (2,673,593)
Proceeds from sales of commercial loans 95,298 63,434 757,593
Proceeds from company-owned life insurance death benefits 17,377 20,583 16,252
Proceeds from sale of premises and equipment and other assets 2,368 1,585 3,513
Purchases of premises and equipment and other assets (44,064) (30,269) (38,375)
Net cash flows provided by (used in) investing activities (1,834,806) (1,371,968) (1,818,876)
Net increase (decrease) in:      
Deposits 1,402,277 1,028,256 2,234,350
Federal funds purchased and interbank borrowings 99,812 (5) (581,099)
Securities sold under agreements to repurchase (56,740) (16,231) (147,598)
Other borrowings (47,130) (110,170) 16,938
Payments for maturities of Federal Home Loan Bank advances (2,520,285) (1,300,243) (2,250,149)
Proceeds from Federal Home Loan Bank advances 2,726,200 1,400,000 2,700,000
Cash dividends paid (225,117) (191,163) (180,030)
Common stock repurchased (71,799) (8,884) (44,308)
Common stock issued for ESPP 1,089 1,034 1,076
Common stock issued for forward sale agreements 443,236 0 0
Net cash flows provided by (used in) financing activities 1,751,543 802,594 1,749,180
Net increase (decrease) in cash and cash equivalents 598,209 52,910 446,646
Cash and cash equivalents at beginning of period 1,227,968 1,175,058 728,412
Cash and cash equivalents at end of period $ 1,826,177 $ 1,227,968 $ 1,175,058