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Segment Reporting - Financial Information for Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financial information for the Company's operating segments |  |  |  |  |
Net interest income (loss) | $ 99,439 | $ 90,017 | $ 281,068 | $ 243,635 |
Provision for loan losses | 2,250 | 2,150 | 5,810 | 5,400 |
Noninterest income | 38,053 | 33,413 | 107,587 | 99,699 |
Noninterest expense | 94,746 | 80,660 | 251,716 | 224,810 |
Income before income taxes | 40,496 | 40,620 | 131,129 | 113,124 |
Income tax expense (benefit) | 8,532 | 14,199 | 28,629 | 37,447 |
Net income (loss) | 31,964 | 26,421 | 102,500 | 75,677 |
Total assets | 12,746,939 | 10,323,687 | 12,746,939 | 10,323,687 | $ 9,829,981
Goodwill | 927,261 | 611,046 | 927,261 | 611,046 | 611,046
Community Banks |  |  |  |  |
Financial information for the Company's operating segments |  |  |  |  |
Goodwill | 924,494 |  | 924,494 |  | 608,279
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) | 101,970 | 92,007 | 288,073 | 249,355 |
Provision for loan losses | 2,250 | 2,150 | 5,810 | 5,400 |
Noninterest income | 32,140 | 28,120 | 90,007 | 83,290 |
Noninterest expense | 89,370 | 75,681 | 235,631 | 209,920 |
Income before income taxes | 42,490 | 42,296 | 136,639 | 117,325 |
Income tax expense (benefit) | 9,226 | 15,199 | 30,558 | 40,021 |
Net income (loss) | 33,264 | 27,097 | 106,081 | 77,304 |
Total assets | 12,634,614 | 10,216,826 | 12,634,614 | 10,216,826 |
Goodwill | 924,494 | 608,279 | 924,494 | 608,279 |
Operating Segments | Insurance |  |  |  |  |
Financial information for the Company's operating segments |  |  |  |  |
Net interest income (loss) | 124 | 114 | 348 | 330 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest income | 2,488 | 2,394 | 7,408 | 7,207 |
Noninterest expense | 1,899 | 1,805 | 5,449 | 5,263 |
Income before income taxes | 713 | 703 | 2,307 | 2,274 |
Income tax expense (benefit) | 186 | 275 | 599 | 888 |
Net income (loss) | 527 | 428 | 1,708 | 1,386 |
Total assets | 25,236 | 25,729 | 25,236 | 25,729 |
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) | 324 | 564 | 952 | 1,575 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest income | 3,641 | 3,213 | 10,882 | 9,599 |
Noninterest expense | 3,284 | 2,887 | 9,889 | 8,788 |
Income before income taxes | 681 | 890 | 1,945 | 2,386 |
Income tax expense (benefit) | 0 | 0 | 0 | 0 |
Net income (loss) | 681 | 890 | 1,945 | 2,386 |
Total assets | 62,502 | 59,703 | 62,502 | 59,703 |
Goodwill | 0 | 0 | 0 | 0 |
Other |  |  |  |  |
Financial information for the Company's operating segments |  |  |  |  |
Net interest income (loss) | (2,979) | (2,668) | (8,305) | (7,625) |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest income | (216) | (314) | (710) | (397) |
Noninterest expense | 193 | 287 | 747 | 839 |
Income before income taxes | (3,388) | (3,269) | (9,762) | (8,861) |
Income tax expense (benefit) | (880) | (1,275) | (2,528) | (3,462) |
Net income (loss) | (2,508) | (1,994) | (7,234) | (5,399) |
Total assets | 24,587 | 21,429 | 24,587 | 21,429 |
Goodwill | $ 0 | $ 0 | $ 0 | $ 0 |

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