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Segment Reporting - Financial Information for Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financial information for the Company's operating segments |  |  |  |  |
Net interest income (loss) | $ 92,389 | $ 79,603 | $ 181,629 | $ 153,618 |
Provision for loan losses | 1,810 | 1,750 | 3,560 | 3,250 |
Noninterest income | 35,581 | 34,265 | 69,534 | 66,286 |
Noninterest expense | 79,026 | 74,841 | 156,970 | 144,150 |
Income before income taxes | 47,134 | 37,277 | 90,633 | 72,504 |
Income tax expense (benefit) | 10,424 | 11,993 | 20,097 | 23,248 |
Net income (loss) | 36,710 | 25,284 | 70,536 | 49,256 |
Total assets | 10,544,475 | 8,872,272 | 10,544,475 | 8,872,272 | $ 9,829,981
Goodwill | 611,046 | 470,534 | 611,046 | 470,534 | 611,046
Community Banks |  |  |  |  |
Financial information for the Company's operating segments |  |  |  |  |
Goodwill | 608,279 |  | 608,279 |  | 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) | 94,676 | 81,392 | 186,103 | 157,348 |
Provision for loan losses | 1,810 | 1,750 | 3,560 | 3,250 |
Noninterest income | 29,949 | 28,592 | 57,867 | 55,170 |
Noninterest expense | 73,628 | 70,018 | 146,261 | 134,239 |
Income before income taxes | 49,187 | 38,216 | 94,149 | 75,029 |
Income tax expense (benefit) | 11,165 | 12,712 | 21,332 | 24,822 |
Net income (loss) | 38,022 | 25,504 | 72,817 | 50,207 |
Total assets | 10,439,785 | 8,776,737 | 10,439,785 | 8,776,737 |
Goodwill | 608,279 | 467,767 | 608,279 | 467,767 |
Operating Segments | Insurance |  |  |  |  |
Financial information for the Company's operating segments |  |  |  |  |
Net interest income (loss) | 118 | 124 | 224 | 216 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest income | 2,148 | 2,264 | 4,920 | 4,813 |
Noninterest expense | 1,819 | 1,766 | 3,550 | 3,458 |
Income before income taxes | 447 | 622 | 1,594 | 1,571 |
Income tax expense (benefit) | 116 | 238 | 413 | 613 |
Net income (loss) | 331 | 384 | 1,181 | 958 |
Total assets | 24,513 | 24,746 | 24,513 | 24,746 |
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) | 315 | 524 | 628 | 1,011 |
Provision for loan losses | 0 | 0 |  | 0 |
Noninterest income | 3,714 | 3,267 | 7,241 | 6,386 |
Noninterest expense | 3,213 | 2,905 | 6,605 | 5,901 |
Income before income taxes | 816 | 886 | 1,264 | 1,496 |
Income tax expense (benefit) | 0 | 0 | 0 | 0 |
Net income (loss) | 816 | 886 | 1,264 | 1,496 |
Total assets | 61,869 | 58,156 | 61,869 | 58,156 |
Goodwill | 0 | 0 | 0 | 0 |
Other |  |  |  |  |
Financial information for the Company's operating segments |  |  |  |  |
Net interest income (loss) | (2,720) | (2,437) | (5,326) | (4,957) |
Provision for loan losses | 0 | 0 | 0 | 0 |
Noninterest income | (230) | 142 | (494) | (83) |
Noninterest expense | 366 | 152 | 554 | 552 |
Income before income taxes | (3,316) | (2,447) | (6,374) | (5,592) |
Income tax expense (benefit) | (857) | (957) | (1,648) | (2,187) |
Net income (loss) | (2,459) | (1,490) | (4,726) | (3,405) |
Total assets | 18,308 | 12,633 | 18,308 | 12,633 |
Goodwill | $ 0 | $ 0 | $ 0 | $ 0 |

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