v3.26.3
Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]              
Net Income (Loss) $ 146,586 $ 119,635 $ 124,732 $ 101,687 $ 389,785 $ 337,648  
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]              
Provision for Loan, Lease, and Other Losses 14,005   16,000   44,394 46,999  
Depreciation         36,857 37,959  
Mortgage Servicing Rights (MSR) Impairment (Recovery)         (6,670) 2,464  
Amortization of Intangible Assets 6,894   2,203   15,990 6,608  
Accretion (Amortization) of Discounts and Premiums, Investments         18,398 30,520  
Other Depreciation and Amortization         25,623 26,307  
Marketable Securities, Gain (Loss)         4 0  
Gain (Loss) on Disposition of Assets (2,676)   (3,340)   (4,305) (727)  
(Gain) loss on mortgage banking activities, net         4,686 103  
Gain (Loss) on Sale of Mortgage Loans 0   0   0 6,976  
Increase (Decrease) in Obligation, Pension Benefits         (18,463) (18,540)  
Payment for Origination and Purchase, Loan, Held-for-Sale         (541,424) (470,456)  
Proceeds from Sale, Loan, Mortgage, Held-for-Sale         546,342 451,869  
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract]              
Increase (Decrease) in Accrued Interest Receivable, Net         (2,577) (678)  
Decrease in net income tax position         60,622 69,984  
Increase (Decrease) in Interest Payable, Net         (3,883) (28,163)  
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities         (26,232) (18,790)  
Increase (Decrease) in Derivative Assets and Liabilities         128,297 (63,192)  
Increase (Decrease) in Other Noncurrent Assets         (13,122) (13,391)  
Increase (Decrease) in Other Operating Assets and Liabilities, Net         17,829 (5,890)  
Net Cash Provided by (Used in) Operating Activities, Total         672,151 397,610  
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]              
Payments for (Proceeds from) Loans and Leases         (1,655,909) (1,224,724)  
Payment for Investing Activity [Abstract]              
Payments to Acquire Debt Securities, Available-for-Sale         (2,131,161) (1,355,308)  
Payments to Acquire Held-to-Maturity Securities         0 (994)  
Payments to Acquire Federal Home Loan Bank Stock         (176,316) (187,426)  
Proceeds from Investing Activity [Abstract]              
Proceeds from Sale of Debt Securities, Available-for-Sale         995,831 0  
Proceeds from Sale of Held-to-Maturity Securities         1,221 0  
Proceeds from Sale of Federal Home Loan Bank Stock         124,515 112,964  
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale         1,100,423 761,540  
Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities         141,438 106,160  
Proceeds from Sale and Maturity of Other Investments         37,275 18,929  
Proceeds from Sale of Mortgage Portfolio         0 564,375  
Payments for (Proceeds from) Productive Assets         (29,958) (28,591)  
Net Change in Tax Credit Investments         (16,784) (16,800)  
Net cash received from the American National acquisition         220,898 0  
Net Cash Provided by (Used in) Investing Activities, Total         (1,388,527) (1,249,875)  
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]              
Increase (Decrease) in Deposits         283,142 233,419  
Proceeds from (Repayments of) Short-Term Debt         (55,856) (70,704)  
Increase (Decrease) in Loans from Federal Home Loan Banks         557,250 1,560,000  
Payments of FHLBank Borrowings, Financing Activities         (202,516) (400,198)  
Proceeds from FHLBank Borrowings, Financing Activities         300,000 200,898  
Finance Lease, Principal Payments         0 (67)  
Repayments of Senior Debt         0 (250,000)  
Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised         14,796 4,876  
Payments of Ordinary Dividends, Common Stock         (130,976) (115,566)  
Payments of Ordinary Dividends, Preferred Stock and Preference Stock         (8,625) (8,625)  
Proceeds from (Payment for) Other Financing Activity         0 (52)  
Net Cash Provided by (Used in) Financing Activities, Total         623,624 1,125,433  
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total         (92,752) 273,168  
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance   1,720,221   1,019,604 1,720,221 1,019,604 $ 1,019,604
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance 1,627,469   1,292,772   1,627,469 1,292,772 1,720,221
Supplemental Cash Flow Information [Abstract]              
Interest Paid, Excluding Capitalized Interest, Operating Activity         730,605 763,622  
Stock Issued         594,144 0  
Fair Value of Assets Acquired         5,228,544 0  
Liabilities Assumed         4,634,400 0  
Goodwill 1,147,081       1,147,081   1,104,992
Servicing Asset at Fair Value, Additions         9,391   $ 8,716
Loan, Transfer from Held-for-Sale to Held-in-Portfolio         4,878 (54,339)  
Board Authorized Purchase Program [Member]              
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]              
Payments for Repurchase of Common Stock         (125,202) (22,292)  
Performance/Service Based RSAs, RSA,              
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]              
Payments for Repurchase of Common Stock         (8,389) (6,256)  
Retained Earnings [Member]              
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]              
Net Income (Loss) $ 146,586 $ 119,635 $ 124,732 $ 101,687 $ 389,785 $ 337,648