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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information (unaudited) |
($ and shares in thousands, except per share data) |  | 2019 Quarters
| Fourth |  | Third |  | Second |  | First
Interest and dividend income |  | $ | 467,233 |  |  | $ | 476,912 |  |  | $ | 474,844 |  |  | $ | 463,311 |
Interest expense |  | 99,014 |  |  | 107,105 |  |  | 107,518 |  |  | 100,850 |
Net interest income before provision for credit losses |  | 368,219 |  |  | 369,807 |  |  | 367,326 |  |  | 362,461 |
Provision for credit losses |  | 18,577 |  |  | 38,284 |  |  | 19,245 |  |  | 22,579 |
Net interest income after provision for credit losses |  | 349,642 |  |  | 331,523 |  |  | 348,081 |  |  | 339,882 |
Noninterest income |  | 63,013 |  |  | 51,474 |  |  | 52,759 |  |  | 42,131 |
Noninterest expense |  | 193,373 |  |  | 176,630 |  |  | 177,663 |  |  | 186,922 |
Income before income taxes |  | 219,282 |  |  | 206,367 |  |  | 223,177 |  |  | 195,091 |
Income tax expense |  | 31,067 |  |  | 34,951 |  |  | 72,797 |  |  | 31,067 |
Net income |  | $ | 188,215 |  |  | $ | 171,416 |  |  | $ | 150,380 |  |  | $ | 164,024 |
EPS |  |  |  |  |  |  |  |
- Basic |  | $ | 1.29 |  |  | $ | 1.18 |  |  | $ | 1.03 |  |  | $ | 1.13 |
- Diluted |  | $ | 1.29 |  |  | $ | 1.17 |  |  | $ | 1.03 |  |  | $ | 1.12 |
Weighted-average number of shares outstanding |  |  |  |  |  |  |  |
- Basic |  | 145,624 |  |  | 145,559 |  |  | 145,546 |  |  | 145,256 |
- Diluted |  | 146,318 |  |  | 146,120 |  |  | 146,052 |  |  | 145,921 |
($ and shares in thousands, except per share data) |  | 2018 Quarters
| Fourth |  | Third |  | Second |  | First
Interest and dividend income |  | $ | 457,334 |  |  | $ | 422,185 |  |  | $ | 400,311 |  |  | $ | 371,873 |
Interest expense |  | 87,918 |  |  | 73,465 |  |  | 58,632 |  |  | 45,180 |
Net interest income before provision for credit losses |  | 369,416 |  |  | 348,720 |  |  | 341,679 |  |  | 326,693 |
Provision for credit losses |  | 17,959 |  |  | 10,542 |  |  | 15,536 |  |  | 20,218 |
Net interest income after provision for credit losses |  | 351,457 |  |  | 338,178 |  |  | 326,143 |  |  | 306,475 |
Noninterest income |  | 41,695 |  |  | 46,502 |  |  | 48,268 |  |  | 74,444 |
Noninterest expense |  | 188,097 |  |  | 179,815 |  |  | 177,419 |  |  | 169,135 |
Income before income taxes |  | 205,055 |  |  | 204,865 |  |  | 196,992 |  |  | 211,784 |
Income tax expense |  | 32,037 |  |  | 33,563 |  |  | 24,643 |  |  | 24,752 |
Net income |  | $ | 173,018 |  |  | $ | 171,302 |  |  | $ | 172,349 |  |  | $ | 187,032 |
EPS |  |  |  |  |  |  |  |
- Basic |  | $ | 1.19 |  |  | $ | 1.18 |  |  | $ | 1.19 |  |  | $ | 1.29 |
- Diluted |  | $ | 1.18 |  |  | $ | 1.17 |  |  | $ | 1.18 |  |  | $ | 1.28 |
Weighted-average number of shares outstanding |  |  |  |  |  |  |  |
- Basic |  | 144,960 |  |  | 144,921 |  |  | 144,899 |  |  | 144,664 |
- Diluted |  | 146,133 |  |  | 146,173 |  |  | 146,091 |  |  | 145,939 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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