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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Interest income      
Interest and fees on loans and leases $ 1,480,112 $ 1,302,604 $ 1,203,186
Interest on federal funds sold and other short-term investments 93,700 66,207 47,069
Interest and dividends on securities:      
Taxable 107,265 128,731 144,420
Tax-exempt 4,776 4,579 6,645
Total interest income 1,685,853 1,502,121 1,401,320
Interest expense      
Interest on deposits 554,491 539,805 391,094
Interest on short-term borrowings 5,801 7,966 6,449
Interest on long-term borrowings 23,397 43,282 83,853
Total interest expense 583,689 591,053 481,396
Net interest income 1,102,164 911,068 919,924
Provision for credit losses 53,866 25,153 31,153
Net interest income after provision for credit losses 1,048,298 885,915 888,771
Other income      
Income from bank-owned life insurance 13,199 11,225 8,330
Mortgage loan servicing income 0 8,958 13,746
Net investment securities gains (losses) 11,170 (7,720) (7,646)
Other income 7,190 7,721 11,056
Total other income 135,154 123,695 135,258
Other expense      
Employee compensation 252,054 234,618 230,809
Employee benefits 54,333 53,621 48,368
Net occupancy expense 49,794 46,084 46,426
Other real estate owned ("OREO") expense 892 576 1,355
Net gains on the sales of OREO properties (148) (75) (60)
Equipment expense 34,917 29,686 29,731
Data processing expense 32,622 29,646 29,395
Mortgage loan servicing expense and impairment 0 2,694 5,596
Bankcard processing expense 2,342 2,490 2,192
FDIC insurance expense 17,022 19,735 30,376
Other expense 156,224 125,956 136,036
Total other expense 600,052 545,031 560,224
Income before income taxes 583,400 464,579 463,805
Income taxes 118,797 91,583 97,492
Net income $ 464,603 $ 372,996 $ 366,313
Earnings per common share:      
Basic $ 3.28 $ 2.76 $ 2.72
Diluted 3.27 2.75 2.71
Dividends per common share $ 1.49 $ 1.48 $ 1.45
Average outstanding shares:      
Basic 141,497,205 134,947,592 134,505,058
Diluted 141,827,360 135,225,417 134,753,820
Fees from trust services [Member]      
Other income      
Revenue from contract $ 19,762 $ 19,450 $ 18,318
Fees from brokerage services [Member]      
Other income      
Revenue from contract 22,729 20,277 16,911
Fees from deposit services [Member]      
Other income      
Revenue from contract 38,995 37,183 37,076
Bankcard fees and merchant discounts [Member]      
Other income      
Revenue from contract 7,913 7,059 7,013
Other service charges, commissions, and fees [Member]      
Other income      
Revenue from contract 4,629 3,485 3,861
Income from mortgage banking activities [Member]      
Other income      
Revenue from contract $ 9,567 $ 16,057 $ 26,593