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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Interest income:    
Loans, including fees $ 334,608 $ 330,540
Securities:    
Taxable 116,256 98,062
Tax-exempt 54,607 55,259
Interest-bearing deposits 79,495 100,361
Federal funds sold 40 80
Resell agreements 111 1,198
Total interest income 585,117 585,500
Interest expense:    
Deposits 133,168 155,634
Federal funds purchased 201 444
Repurchase agreements 32,419 35,948
Junior subordinated deferrable interest debentures 1,945 2,259
Subordinated notes 1,164 1,164
Total interest expense 168,897 195,449
Net interest income 416,220 390,051
Credit loss expense 13,070 13,650
Net interest income after credit loss expense 403,150 376,401
Non-interest income:    
Trust and investment management fees 42,931 39,085
Service charges on deposit accounts 28,621 24,795
Insurance commissions and fees 21,019 18,296
Interchange and card transaction fees 5,402 4,474
Other charges, commissions, and fees 13,586 12,060
Net gain (loss) on securities transactions (14) 0
Other 12,466 12,667
Total non-interest income 124,011 111,377
Non-interest expense:    
Salaries and wages 160,857 148,000
Employee benefits 42,157 35,970
Net occupancy 33,277 31,778
Technology, furniture, and equipment 40,118 34,995
Deposit insurance 7,184 14,724
Other 64,473 60,750
Total non-interest expense 348,066 326,217
Income before income taxes 179,095 161,561
Income taxes 28,173 25,871
Net income 150,922 135,690
Preferred stock dividends 1,669 1,669
Net income available to common shareholders $ 149,253 $ 134,021
Earnings per common share:    
Basic $ 2.30 $ 2.06
Diluted $ 2.30 $ 2.06