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Segment Reporting - Financial Information for Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Financial information for the Company's operating segments |  |  |  |  |  |  |
Net interest income (loss) | $ 105,782 |  | $ 112,800 |  | $ 212,384 | $ 225,947 |
Provision for credit losses on loans | 26,900 |  | 900 |  | 53,250 | 2,400 |
Noninterest income | 64,170 |  | 41,960 |  | 101,740 | 77,845 |
Noninterest expense | 118,285 |  | 93,290 |  | 233,326 | 182,122 |
Income (loss) before income taxes | 24,767 |  | 60,570 |  | 27,548 | 119,270 |
Income tax expense (benefit) | 4,637 |  | 13,945 |  | 5,410 | 27,535 |
Net income (loss) | 20,130 | $ 2,008 | 46,625 | $ 45,110 | 22,138 | 91,735 |
Total assets | 14,897,207 |  | 12,892,653 |  | 14,897,207 | 12,892,653 | $ 13,400,618
Goodwill | 939,683 |  | 932,971 |  | 939,683 | 932,971 | 939,683
Community Banks |  |  |  |  |  |  |
Financial information for the Company's operating segments |  |  |  |  |  |  |
Goodwill | 936,916 |  |  |  | 936,916 |  | 936,916
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) | 108,110 |  | 115,664 |  | 216,970 | 231,722 |
Provision for credit losses on loans | 26,861 |  | 900 |  | 53,073 | 2,400 |
Noninterest income | 58,115 |  | 36,293 |  | 88,798 | 65,878 |
Noninterest expense | 112,776 |  | 87,596 |  | 222,060 | 170,909 |
Income (loss) before income taxes | 26,588 |  | 63,461 |  | 30,635 | 124,291 |
Income tax expense (benefit) | 5,425 |  | 14,910 |  | 6,705 | 29,196 |
Net income (loss) | 21,163 |  | 48,551 |  | 23,930 | 95,095 |
Total assets | 14,775,811 |  | 12,790,623 |  | 14,775,811 | 12,790,623 |
Goodwill | 936,916 |  | 930,204 |  | 936,916 | 930,204 |
Operating segments | Insurance |  |  |  |  |  |  |
Financial information for the Company's operating segments |  |  |  |  |  |  |
Net interest income (loss) | 111 |  | 171 |  | 298 | 339 |
Provision for credit losses on loans | 0 |  | 0 |  | 0 | 0 |
Noninterest income | 2,153 |  | 2,222 |  | 5,093 | 5,101 |
Noninterest expense | 1,848 |  | 1,898 |  | 3,734 | 3,713 |
Income (loss) before income taxes | 416 |  | 495 |  | 1,657 | 1,727 |
Income tax expense (benefit) | 111 |  | 128 |  | 441 | 448 |
Net income (loss) | 305 |  | 367 |  | 1,216 | 1,279 |
Total assets | 29,095 |  | 26,722 |  | 29,095 | 26,722 |
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) | 397 |  | 409 |  | 847 | 759 |
Provision for credit losses on loans | 39 |  | 0 |  | 177 | 0 |
Noninterest income | 4,312 |  | 3,890 |  | 8,656 | 7,549 |
Noninterest expense | 3,452 |  | 3,464 |  | 7,397 | 6,912 |
Income (loss) before income taxes | 1,218 |  | 835 |  | 1,929 | 1,396 |
Income tax expense (benefit) | 0 |  | 0 |  | 0 | 0 |
Net income (loss) | 1,218 |  | 835 |  | 1,929 | 1,396 |
Total assets | 68,257 |  | 61,363 |  | 68,257 | 61,363 |
Goodwill | 0 |  | 0 |  | 0 | 0 |
Other |  |  |  |  |  |  |
Financial information for the Company's operating segments |  |  |  |  |  |  |
Net interest income (loss) | (2,836) |  | (3,444) |  | (5,731) | (6,873) |
Provision for credit losses on loans | 0 |  | 0 |  | 0 | 0 |
Noninterest income | (410) |  | (445) |  | (807) | (683) |
Noninterest expense | 209 |  | 332 |  | 135 | 588 |
Income (loss) before income taxes | (3,455) |  | (4,221) |  | (6,673) | (8,144) |
Income tax expense (benefit) | (899) |  | (1,093) |  | (1,736) | (2,109) |
Net income (loss) | (2,556) |  | (3,128) |  | (4,937) | (6,035) |
Total assets | 24,044 |  | 13,945 |  | 24,044 | 13,945 |
Goodwill | $ 0 |  | $ 0 |  | $ 0 | $ 0 |

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