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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Interest income:      
Loans, including fees $ 1,182,492,000 $ 924,043,000 $ 919,744,000
Securities:      
Taxable 67,063,000 34,769,000 35,663,000
Tax-exempt 81,522,000 64,848,000 58,867,000
Federal funds sold and other 42,858,000 7,554,000 6,768,000
Total interest income 1,373,935,000 1,031,214,000 1,021,042,000
Interest expense:      
Deposits 204,119,000 54,116,000 135,547,000
Securities sold under agreements to repurchase 794,000 239,000 350,000
Federal Home Loan Bank advances and other borrowings 39,729,000 44,458,000 63,357,000
Total interest expense 244,642,000 98,813,000 199,254,000
Net interest income 1,129,293,000 932,401,000 821,788,000
Provision for credit losses 67,925,000 16,126,000 203,815,000
Net interest income after provision for credit losses 1,061,368,000 916,275,000 617,973,000
Noninterest income:      
Total noninterest income 416,124,000 395,734,000 317,840,000
Noninterest expense:      
Salaries and employee benefits 510,175,000 436,006,000 334,483,000
Equipment and occupancy 109,672,000 95,250,000 88,475,000
Other real estate (benefit) expense, net 280,000 (712,000) 8,555,000
Marketing and other business development 21,073,000 12,888,000 10,693,000
Postage and supplies 10,168,000 8,195,000 7,819,000
Amortization of intangibles 7,810,000 8,518,000 9,793,000
Other noninterest expense 120,821,000 99,959,000 104,637,000
Total noninterest expense 779,999,000 660,104,000 564,455,000
Income (Loss) from Continuing Operations before Income Taxes, Domestic 697,493,000 651,905,000 371,358,000
Income tax expense 136,751,000 124,582,000 59,037,000
Net income 560,742,000 527,323,000 312,321,000
Preferred stock dividends 15,192,000 15,192,000 7,596,000
Net income available to common shareholders $ 545,550,000 $ 512,131,000 $ 304,725,000
Per share information:      
Basic net income per common share $ 7.20 $ 6.79 $ 4.04
Diluted net income per common share $ 7.17 $ 6.75 $ 4.03
Weighted average common shares outstanding:      
Basic 75,735,404 75,468,339 75,376,489
Diluted 76,133,865 75,927,147 75,654,385
Service charges on deposit accounts      
Noninterest income:      
Total noninterest income $ 44,675,000 $ 41,311,000 $ 34,282,000
Investment services      
Noninterest income:      
Total noninterest income 46,441,000 37,917,000 29,537,000
Insurance sales commissions      
Noninterest income:      
Total noninterest income 12,186,000 10,516,000 10,055,000
Gains on mortgage loans sold, net      
Noninterest income:      
Total noninterest income 7,268,000 32,424,000 60,042,000
Investment gains on sales, net      
Noninterest income:      
Total noninterest income 156,000 759,000 986,000
Trust fees      
Noninterest income:      
Total noninterest income 23,511,000 20,724,000 16,496,000
Income from equity method investment      
Noninterest income:      
Total noninterest income 145,466,000 122,274,000 83,539,000
Other noninterest income      
Noninterest income:      
Total noninterest income $ 136,421,000 $ 129,809,000 $ 82,903,000