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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 $ 486,073 $ 460,815 $ 392,602
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 27,314 32,301 34,720
Provision for credit losses 51,183 52,167 59,103
Gain on other real estate and foreclosed assets (761) (2,022) (967)
Deferred tax expense 23,222 4,299 13,986
Increase in cash surrender value of life insurance contracts (25,005) (27,315) (17,671)
(Gain) loss on disposal or impairment of assets 294 (1,242) (15,753)
Loss on sale of securities available for sale 11   65,380
Net (increase) decrease in loans held for sale (11,108) 4,504 (24,589)
Net amortization of securities premium/discount 13,084 13,704 16,383
Amortization of intangible assets 9,953 9,413 11,556
Stock-based compensation expense 24,444 22,703 24,652
Net change in derivative collateral liability (35,791) (5,288) 58,326
Increase (decrease) in interest payable and other liabilities (15,910) (16,833) 48,714
(Increase) decrease in other assets (5,845) 84,981 (160,890)
Other, net 620 (6,445) (10,303)
Net cash provided by operating activities 541,778 625,742 495,249
CASH FLOWS FROM INVESTING ACTIVITIES:      
Proceeds from sales of securities available for sale 229,200   977,114
Proceeds from maturities of securities available for sale 452,772 454,188 813,214
Purchases of securities available for sale (1,237,741) (750,265) (1,044,988)
Proceeds from maturities of securities held to maturity 293,656 238,899 163,266
Purchases of securities held to maturity     (6,023)
Proceeds received (made) to terminate hedge instruments 2,270 (13,730) 16,360
Net redemptions (purchases) of Federal Home Loan Bank stock (16,756) 134,667 (68,057)
Net (increase) decrease in short-term investments 807,449 (312,633) (303,022)
Proceeds from sales of loans and leases 110,877 119,166 115,119
Net (increase) decrease in loans (847,676) 407,460 (968,237)
Net cash paid in business acquisition (112,071)    
Purchases of property and equipment (18,720) (10,237) (25,025)
Proceeds from sales of property   6,144 33,130
Proceeds from sales of other real estate and foreclosed assets 27,647 1,795 3,575
Other, net (5,263) (698) (1,637)
Net cash provided by (used in) investing activities (314,356) 274,756 (295,211)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Net increase (decrease) in deposits (213,077) (197,208) 619,710
Net increase (decrease) in short-term borrowings 378,277 (515,814) (716,442)
Dividends paid (153,803) (130,840) (104,697)
Payroll tax remitted on net share settlement of equity awards (8,301) (9,358) (5,681)
Other repurchases of common stock (246,874) (37,690)  
Proceeds from dividend reinvestment and stock purchase plan 4,441 4,120 3,815
Net cash used in financing activities (239,337) (886,790) (203,295)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS (11,915) 13,708 (3,257)
CASH AND DUE FROM BANKS, BEGINNING 574,910 561,202 564,459
CASH AND DUE FROM BANKS, ENDING 562,995 574,910 561,202
SUPPLEMENTAL INFORMATION      
Income taxes paid (net of refunds received) 103,142 66,111 101,749
Interest paid 511,358 635,770 487,681
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES      
Assets acquired in settlement of loans $ 17,634 $ 28,491 $ 4,302