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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest income:      
Loans, including fees $ 850,472,000 $ 578,286,000 $ 335,735,000
Securities:      
Taxable 48,192,000 39,060,000 19,179,000
Tax-exempt 35,995,000 13,712,000 6,014,000
Federal funds sold and other 12,058,000 5,080,000 2,681,000
Total interest income 946,717,000 636,138,000 363,609,000
Interest expense:      
Deposits 151,043,000 59,584,000 23,918,000
Securities sold under agreements to repurchase 588,000 406,000 185,000
Federal Home Loan Bank advances and other borrowings 58,744,000 32,842,000 14,512,000
Total interest expense 210,375,000 92,832,000 38,615,000
Net interest income 736,342,000 543,306,000 324,994,000
Provision for loan losses 34,377,000 23,664,000 18,328,000
Net interest income after provision for loan losses 701,965,000 519,642,000 306,666,000
Noninterest income:      
Total noninterest income 200,870,000 144,904,000 121,003,000
Noninterest expense:      
Salaries and employee benefits 271,673,000 209,662,000 140,819,000
Equipment and occupancy 74,276,000 54,092,000 35,072,000
Other real estate expense, net 723,000 1,079,000 396,000
Marketing and other business development 11,712,000 8,321,000 6,536,000
Postage and supplies 7,815,000 5,736,000 3,929,000
Amortization of intangibles 10,549,000 8,816,000 4,281,000
Merger related expenses 8,259,000 31,843,000 11,747,000
Other noninterest expense 67,880,000 47,011,000 33,505,000
Total noninterest expense 452,887,000 366,560,000 236,285,000
Income before income taxes 449,948,000 297,986,000 191,384,000
Income tax expense 90,508,000 124,007,000 64,159,000
Net income $ 359,440,000 $ 173,979,000 $ 127,225,000
Per share information:      
Basic net income per common share $ 4.66 $ 2.73 $ 2.96
Diluted net income per common share $ 4.64 $ 2.70 $ 2.91
Weighted average common shares outstanding:      
Basic 77,111,372 63,760,578 43,037,083
Diluted 77,449,917 64,328,189 43,731,992
Service charges on deposit accounts      
Noninterest income:      
Total noninterest income $ 24,906,000 $ 20,034,000 $ 14,501,000
Investment services      
Noninterest income:      
Total noninterest income 21,175,000 14,315,000 10,757,000
Insurance sales commissions      
Noninterest income:      
Total noninterest income 9,331,000 7,405,000 5,310,000
Gain on mortgage loans sold, net      
Noninterest income:      
Total noninterest income 14,564,000 18,625,000 15,754,000
Investment gains (losses) on sales, net      
Noninterest income:      
Total noninterest income (2,254,000) (8,265,000) 395,000
Trust fees      
Noninterest income:      
Total noninterest income 13,143,000 8,664,000 6,328,000
Income from equity method investment      
Noninterest income:      
Total noninterest income 51,222,000 37,958,000 31,403,000
Other noninterest income      
Noninterest income:      
Total noninterest income $ 68,783,000 $ 46,168,000 $ 36,555,000