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Segment Reporting - Financial Information for Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Financial information for the Company's operating segments              
Net interest income (loss) $ 112,800   $ 92,389   $ 225,947 $ 181,629  
Provision for loan losses 900   1,810   2,400 3,560  
Noninterest income 41,960   35,581   77,845 69,534  
Noninterest expense 93,290   79,026   182,122 156,970  
Income before income taxes 60,570   47,134   119,270 90,633  
Income tax expense (benefit) 13,945   10,424   27,535 20,097  
Net income (loss) 46,625 $ 45,110 36,710 $ 33,826 91,735 70,536  
Total assets 12,892,653   10,544,475   12,892,653 10,544,475 $ 12,934,878
Goodwill 932,971   611,046   932,971 611,046 932,928
Community Banks              
Financial information for the Company's operating segments              
Goodwill 930,204       930,204   930,161
Insurance              
Financial information for the Company's operating segments              
Goodwill 2,767       2,767   $ 2,767
Operating Segments | Community Banks              
Financial information for the Company's operating segments              
Net interest income (loss) 115,664   94,676   231,722 186,103  
Provision for loan losses 900   1,810   2,400 3,560  
Noninterest income 36,293   29,949   65,878 57,867  
Noninterest expense 87,596   73,628   170,909 146,261  
Income before income taxes 63,461   49,187   124,291 94,149  
Income tax expense (benefit) 14,910   11,165   29,196 21,332  
Net income (loss) 48,551   38,022   95,095 72,817  
Total assets 12,790,623   10,439,785   12,790,623 10,439,785  
Goodwill 930,204   608,279   930,204 608,279  
Operating Segments | Insurance              
Financial information for the Company's operating segments              
Net interest income (loss) 171   118   339 224  
Provision for loan losses 0   0   0 0  
Noninterest income 2,222   2,148   5,101 4,920  
Noninterest expense 1,898   1,819   3,713 3,550  
Income before income taxes 495   447   1,727 1,594  
Income tax expense (benefit) 128   116   448 413  
Net income (loss) 367   331   1,279 1,181  
Total assets 26,722   24,513   26,722 24,513  
Goodwill 2,767   2,767   2,767 2,767  
Operating Segments | Wealth Management              
Financial information for the Company's operating segments              
Net interest income (loss) 409   315   759 628  
Provision for loan losses 0   0   0 0  
Noninterest income 3,890   3,714   7,549 7,241  
Noninterest expense 3,464   3,213   6,912 6,605  
Income before income taxes 835   816   1,396 1,264  
Income tax expense (benefit) 0   0   0 0  
Net income (loss) 835   816   1,396 1,264  
Total assets 61,363   61,869   61,363 61,869  
Goodwill 0   0   0 0  
Other              
Financial information for the Company's operating segments              
Net interest income (loss) (3,444)   (2,720)   (6,873) (5,326)  
Provision for loan losses 0   0   0 0  
Noninterest income (445)   (230)   (683) (494)  
Noninterest expense 332   366   588 554  
Income before income taxes (4,221)   (3,316)   (8,144) (6,374)  
Income tax expense (benefit) (1,093)   (857)   (2,109) (1,648)  
Net income (loss) (3,128)   (2,459)   (6,035) (4,726)  
Total assets 13,945   18,308   13,945 18,308  
Goodwill $ 0   $ 0   $ 0 $ 0