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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest income:      
Loans, including fees $ 578,286,155 $ 335,734,531 $ 232,847,334
Securities:      
Taxable 39,060,195 19,179,012 15,060,392
Tax-exempt 13,711,759 6,014,037 5,783,443
Federal funds sold and other 5,080,140 2,681,348 1,478,711
Total interest income 636,138,249 363,608,928 255,169,880
Interest expense:      
Deposits 59,583,527 23,917,318 13,209,425
Securities sold under agreements to repurchase 405,837 185,305 138,347
Federal Home Loan Bank advances and other borrowings 32,841,874 14,512,024 5,189,193
Total interest expense 92,831,238 38,614,647 18,536,965
Net interest income 543,307,011 324,994,281 236,632,915
Provision for loan losses 23,663,944 18,328,058 9,188,497
Net interest income after provision for loan losses 519,643,067 306,666,223 227,444,418
Noninterest income:      
Service charges on deposit accounts 20,032,979 14,500,679 12,745,742
Investment services 14,315,228 10,757,348 9,971,313
Insurance sales commissions 7,404,928 5,309,494 4,824,007
Gains on mortgage loans sold, net (18,624,621) (15,754,473) (7,668,960)
Investment gains (losses) on sales, net (8,264,639) 395,186 552,063
Trust fees 8,663,590 6,328,021 5,461,257
Income from equity method investment 37,957,692 31,402,923 20,591,484
Other noninterest income 46,168,416 36,554,938 24,715,442
Total noninterest income 144,902,815 121,003,062 86,530,268
Noninterest expense:      
Salaries and employee benefits 209,661,812 140,818,772 105,928,914
Equipment and occupancy 54,091,964 35,071,654 27,241,477
Other real estate expense (benefit), net 1,079,193 395,561 (305,956)
Marketing and other business development 8,321,073 6,536,484 4,863,307
Postage and supplies 5,735,716 3,929,323 3,228,300
Amortization of intangibles 8,815,609 4,281,459 1,973,953
Merger related expenses 31,843,413 11,746,584 4,797,018
Other noninterest expense 47,011,079 33,505,586 23,149,743
Total noninterest expense 366,559,859 236,285,423 170,876,756
Income before income taxes 297,986,023 191,383,862 143,097,930
Income tax expense 124,006,536 64,159,167 47,588,528
Net income $ 173,979,487 $ 127,224,695 $ 95,509,402
Per share information:      
Basic net income per common share $ 2.73 $ 2.96 $ 2.58
Diluted net income per common share $ 2.70 $ 2.91 $ 2.52
Weighted average common shares outstanding:      
Basic 63,760,578 43,037,083 37,015,468
Diluted 64,328,189 43,731,992 37,973,788