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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Interest income:      
Loans, including fees $ 1,950,365,000 $ 1,182,492,000 $ 924,043,000
Securities:      
Taxable 140,308,000 67,063,000 34,769,000
Tax-exempt 97,625,000 81,522,000 64,848,000
Federal funds sold and other 165,070,000 42,858,000 7,554,000
Total interest income 2,353,368,000 1,373,935,000 1,031,214,000
Interest expense:      
Deposits 983,118,000 204,119,000 54,116,000
Securities sold under agreements to repurchase 3,744,000 794,000 239,000
Federal Home Loan Bank advances and other borrowings 104,388,000 39,729,000 44,458,000
Total interest expense 1,091,250,000 244,642,000 98,813,000
Net interest income 1,262,118,000 1,129,293,000 932,401,000
Provision for credit losses 93,596,000 67,925,000 16,126,000
Net interest income after provision for credit losses 1,168,522,000 1,061,368,000 916,275,000
Noninterest income:      
Total noninterest income 433,253,000 416,124,000 395,734,000
Noninterest expense:      
Salaries and employee benefits 531,828,000 510,175,000 436,006,000
Equipment and occupancy 138,980,000 109,672,000 95,250,000
Other real estate (benefit) expense, net 315,000 280,000 (712,000)
Marketing and other business development 23,914,000 21,073,000 12,888,000
Postage and supplies 11,143,000 10,168,000 8,195,000
Amortization of intangibles 7,090,000 7,810,000 8,518,000
Other noninterest expense 174,499,000 120,821,000 99,959,000
Total noninterest expense 887,769,000 779,999,000 660,104,000
Income before income taxes 714,006,000 697,493,000 651,905,000
Income tax expense 151,854,000 136,751,000 124,582,000
Net income 562,152,000 560,742,000 527,323,000
Preferred stock dividends 15,192,000 15,192,000 15,192,000
Net income available to common shareholders $ 546,960,000 $ 545,550,000 $ 512,131,000
Per share information:      
Basic net income per common share $ 7.20 $ 7.20 $ 6.79
Diluted net income per common share $ 7.14 $ 7.17 $ 6.75
Weighted average common shares outstanding:      
Basic 76,016,370 75,735,404 75,468,339
Diluted 76,647,543 76,133,865 75,927,147
Service charges on deposit accounts      
Noninterest income:      
Total noninterest income $ 49,223,000 $ 44,675,000 $ 41,311,000
Investment services      
Noninterest income:      
Total noninterest income 52,432,000 46,441,000 37,917,000
Insurance sales commissions      
Noninterest income:      
Total noninterest income 13,670,000 12,186,000 10,516,000
Gains on mortgage loans sold, net      
Noninterest income:      
Total noninterest income 6,511,000 7,268,000 32,424,000
Investment gains (losses) on sales, net      
Noninterest income:      
Total noninterest income (19,674,000) 156,000 759,000
Trust fees      
Noninterest income:      
Total noninterest income 26,683,000 23,511,000 20,724,000
Income from equity method investment      
Noninterest income:      
Total noninterest income 85,402,000 145,466,000 122,274,000
Other noninterest income      
Noninterest income:      
Total noninterest income 132,958,000 135,964,000 129,794,000
Gain loss on sale of fixed assets      
Noninterest income:      
Total noninterest income $ 86,048,000 $ 457,000 $ 15,000