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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 |

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