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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
Total
Bankers Healthcare Group, LLC [Member]
Avenue Financial Holdings, Inc. (Avenue) [Member]
CapitalMark Bank & Trust [Member]
Magna Bank [Member]
Bank of North Carolina [Member]
Common Stock [Member]
Common Stock [Member]
Bankers Healthcare Group, LLC [Member]
Common Stock [Member]
Avenue Financial Holdings, Inc. (Avenue) [Member]
Common Stock [Member]
CapitalMark Bank & Trust [Member]
Common Stock [Member]
Magna Bank [Member]
Common Stock [Member]
Bank of North Carolina [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Bankers Healthcare Group, LLC [Member]
Additional Paid-in Capital [Member]
Avenue Financial Holdings, Inc. (Avenue) [Member]
Additional Paid-in Capital [Member]
CapitalMark Bank & Trust [Member]
Additional Paid-in Capital [Member]
Magna Bank [Member]
Additional Paid-in Capital [Member]
Bank of North Carolina [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Balance at Dec. 31, 2014 $ 802,693,381           $ 35,732,483           $ 561,431,449           $ 201,371,081 $ 4,158,368
Balance (in shares) at Dec. 31, 2014             35,732,483                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                        
Exercise of employee common stock options, stock appreciation rights, and related tax benefits $ 7,491,942           $ 304,313           7,187,629              
Exercise of employee common stock options, stock appreciation rights, and related tax benefits (in shares) 303,754           304,313                          
Issuance of restricted common shares, net of forfeitures $ 0           $ 257,218           (257,218)              
Issuance of restricted common shares, net of forfeitures (in shares)             257,218                          
Common stock issued in conjunction with acquisition 269,492,990     $ 205,955,059 $ 63,537,931         $ 3,306,184 $ 1,371,717         $ 202,648,875 $ 62,166,214      
Common stock issued in conjunction with acquisition (in shares)                   3,306,184 1,371,717                  
Restricted shares withheld for taxes (967,353)           $ (65,851)           (901,502)              
Restricted shares withheld for taxes (in shares)             (65,851)                          
Compensation expense for restricted shares 7,341,603                       7,341,603              
Common dividends paid (18,307,075)                                   (18,307,075)  
Net income 95,509,402                                   95,509,402  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (7,643,590)                                     (7,643,590)
Balance at Dec. 31, 2015 1,155,611,300           $ 40,906,064           839,617,050           278,573,408 (3,485,222)
Balance (in shares) at Dec. 31, 2015             40,906,064                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                        
Exercise of employee common stock options, stock appreciation rights, and related tax benefits $ 17,436,175           $ 699,810           16,736,365              
Exercise of employee common stock options, stock appreciation rights, and related tax benefits (in shares) 698,673           699,810                          
Issuance of restricted common shares, net of forfeitures $ 0           $ 200,098           (200,098)              
Issuance of restricted common shares, net of forfeitures (in shares)             200,098                          
Common stock issued in conjunction with acquisition 222,162,640 $ 39,694,036 $ 182,468,604         $ 860,470 $ 3,760,326         $ 38,833,566 $ 178,708,278          
Common stock issued in conjunction with acquisition (in shares)               860,470 3,760,326                      
Restricted shares withheld for taxes (1,242,673)           $ (67,391)           (1,175,282)              
Restricted shares withheld for taxes (in shares)             (67,391)                          
Compensation expense for restricted shares 10,970,849                       10,970,849              
Common dividends paid (24,725,598)                                   (24,725,598)  
Net income 127,224,695                                   127,224,695  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (10,741,276)                                     (10,741,276)
Balance at Dec. 31, 2016 1,496,696,112           $ 46,359,377           1,083,490,728           381,072,505 (14,226,498)
Balance (in shares) at Dec. 31, 2016             46,359,377                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                        
Exercise of employee common stock options, stock appreciation rights, and related tax benefits $ 5,484,622           $ 275,431           5,209,191              
Exercise of employee common stock options, stock appreciation rights, and related tax benefits (in shares) 275,904           275,431                          
Issuance of restricted common shares, net of forfeitures $ 0           $ 271,602           (271,602)              
Stock Issued During Period, Value, Other 192,193,750           $ 3,220,000           188,973,750              
Issuance of restricted common shares, net of forfeitures (in shares)             271,602                          
Common stock issued in conjunction with acquisition 1,850,968,026         $ 1,850,968,026           $ 27,687,100           $ 1,823,280,926    
Common stock issued in conjunction with acquisition (in shares)                       27,687,100                
Restricted shares withheld for taxes (4,991,275)           $ (73,874)           (4,917,401)              
Restricted shares withheld for taxes (in shares)             (73,874)                          
Compensation expense for restricted shares 19,538,083                       19,538,083              
Common dividends paid (35,907,449)                                   (35,907,449)  
Net income 173,979,487                                   173,979,487  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 9,990,675                                     9,990,675
Balance at Dec. 31, 2017 $ 3,707,952,031           $ 77,739,636           $ 3,115,303,675           $ 519,144,543 $ (4,235,823)
Balance (in shares) at Dec. 31, 2017             77,739,636