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Segment Reporting - Financial Information for Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financial information for the Company's operating segments          
Net interest income (loss) $ 90,017 $ 75,731 $ 243,635 $ 222,942  
Provision for loan losses 2,150 2,650 5,400 5,880  
Noninterest income 33,413 38,272 99,699 107,160  
Noninterest expense 80,660 76,468 224,810 223,541  
Income before income taxes 40,620 34,885 113,124 100,681  
Income tax expense (benefit) 14,199 11,706 37,447 33,386  
Net income (loss) 26,421 23,179 75,677 67,295  
Total assets 10,323,687 8,542,471 10,323,687 8,542,471 $ 8,699,851
Goodwill 611,046 470,534 611,046 470,534 470,534
Community Banks          
Financial information for the Company's operating segments          
Goodwill 608,279   608,279   467,767
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) 92,007 77,064 249,355 225,449  
Provision for loan losses 2,150 2,655 5,400 5,893  
Noninterest income 28,120 32,773 83,290 89,515  
Noninterest expense 75,681 71,784 209,920 209,442  
Income before income taxes 42,296 35,398 117,325 99,629  
Income tax expense (benefit) 15,199 12,284 40,021 33,875  
Net income (loss) 27,097 23,114 77,304 65,754  
Total assets 10,216,826 8,446,403 10,216,826 8,446,403  
Goodwill 608,279 467,767 608,279 467,767  
Operating Segments | Insurance          
Financial information for the Company's operating segments          
Net interest income (loss) 114 85 330 259  
Provision for loan losses 0 0 0 0  
Noninterest income 2,394 2,454 7,207 7,734  
Noninterest expense 1,805 1,762 5,263 5,240  
Income before income taxes 703 777 2,274 2,753  
Income tax expense (benefit) 275 301 888 1,074  
Net income (loss) 428 476 1,386 1,679  
Total assets 25,729 22,708 25,729 22,708  
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) 564 472 1,575 1,349  
Provision for loan losses 0 (5) 0 (13)  
Noninterest income 3,213 3,248 9,599 9,296  
Noninterest expense 2,887 2,745 8,788 8,312  
Income before income taxes 890 980 2,386 2,346  
Income tax expense (benefit) 0 0 0 0  
Net income (loss) 890 980 2,386 2,346  
Total assets 59,703 51,176 59,703 51,176  
Goodwill 0 0 0 0  
Other          
Financial information for the Company's operating segments          
Net interest income (loss) (2,668) (1,890) (7,625) (4,115)  
Provision for loan losses 0 0 0 0  
Noninterest income (314) (203) (397) 615  
Noninterest expense 287 177 839 547  
Income before income taxes (3,269) (2,270) (8,861) (4,047)  
Income tax expense (benefit) (1,275) (879) (3,462) (1,563)  
Net income (loss) (1,994) (1,391) (5,399) (2,484)  
Total assets 21,429 22,184 21,429 22,184  
Goodwill $ 0 $ 0 $ 0 $ 0