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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Cash Flows from Operating Activities          
Net income $ 77,651 $ 67,514 $ 224,607 $ 205,778  
Adjustments to reconcile net income to net cash provided by operating activities:          
Provision for credit losses 28,731 14,500 55,431 23,000  
Provision for losses on other real estate owned     890 1,164  
Deferred tax provision/(benefit)     10,007 (20,452)  
Depreciation and amortization     5,184 5,465  
Amortization of right-of-use asset     7,045 7,309  
Change in operating lease liabilities     2,228 (1,891)  
Net gains on sale and transfers of other real estate owned     (2,968) 0  
Net losses/(gains) on sale of loans     57 (58)  
Loss on sales or disposal of premises and equipment     63 0  
Amortization on alternative energy partnerships, venture capital and other investments     32,382 61,905  
Net gains on sales of securities available-for-sale     0 (1,107)  
Amortization/accretion of securities available-for-sale premiums/discounts, net     (19,721) (19,182)  
Unrealized loss on equity securities (3,300) (4,300) 2,318 6,204  
Stock-based compensation and stock issued to officers as compensation     5,711 4,916  
Net change in accrued interest receivable and other assets     22,830 9,666  
Net change in other liabilities     (32,557) (40,382)  
Net cash provided by operating activities     313,507 242,335  
Cash Flows from Investing Activities          
Purchase of securities available-for-sale     (1,289,400) (988,498)  
Proceeds from repayments, maturities and calls of securities available-for-sale     1,249,581 1,097,594  
Proceeds from sale of securities available-for-sale     0 33,690  
Proceeds from sale of other real estate owned     10,316 0  
Purchase of Federal Home Loan Bank stock     0 (12,535)  
Redemption of Federal Home Loan Bank stock     0 13,031  
Proceeds from sale of loans originally classified as held-for-investment     42,134 130,010  
Net (increase)/decrease in loans     (820,318) 26,036  
Purchase of premises and equipment     (4,455) (2,654)  
Net decrease/(increase) in affordable housing investments and alternative energy partnerships     2,004 (31,737)  
Net cash (used for)/provided by investing activities     (810,138) 264,937  
Cash Flows from Financing Activities          
Increase in deposits     834,819 618,611  
Advances from Federal Home Loan Bank     10,145,000 6,968,000  
Repayment of Federal Home Loan Bank borrowings     (10,015,000) (7,448,000)  
Cash dividends paid     (70,944) (73,804)  
Purchases of treasury stock     (127,923) (60,610)  
Proceeds from shares issued under Dividend Reinvestment Plan     1,970 2,217  
Taxes paid related to net share settlement of RSUs     (2,758) (3,722)  
Net cash provided by financing activities     765,164 2,692  
Increase in cash, cash equivalents, and restricted cash     268,533 509,964  
Cash, cash equivalents, and restricted cash, beginning of the period     1,039,520 828,801 $ 828,801
Cash, cash equivalents, and restricted cash, end of the period $ 1,308,053 $ 1,338,765 1,308,053 1,338,765 $ 1,039,520
Supplemental disclosure of cash flow information          
Interest     433,983 494,181  
Income taxes paid     43,410 41,027  
Non-cash investing and financing activities:          
Net change in unrealized holding gain on securities available-for-sale, net of tax     25,909 19,737  
Net change in unrealized holding loss on cash flow hedge derivatives     0 (774)  
Loans transferred from held-for-investment to held-for-sale     51,128 135,141  
Transfers to other real estate owned from loans held-for-investment     10,351 0  
Transfers to other real estate owned from loans held-for-sale     $ 8,938 $ 0