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Quarterly Financial Information (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information (Unaudited) | Quarterly Financial Information (Unaudited)
|  | Quarters Ended
($ and shares in thousands, except per share data) |  | December 31, |  | September 30, |  | June 30, |  | March 31,
2017 |  |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income |  | $ | 359,765 |  |  | $ | 339,910 |  |  | $ | 322,775 |  |  | $ | 302,669 |
Interest expense |  | 40,064 |  |  | 36,755 |  |  | 32,684 |  |  | 30,547 |
Net interest income before provision for credit losses |  | 319,701 |  |  | 303,155 |  |  | 290,091 |  |  | 272,122 |
Provision for credit losses |  | 15,517 |  |  | 12,996 |  |  | 10,685 |  |  | 7,068 |
Net interest income after provision for credit losses |  | 304,184 |  |  | 290,159 |  |  | 279,406 |  |  | 265,054 |
Noninterest income |  | 45,359 |  |  | 49,624 |  |  | 47,400 |  |  | 116,023 |
Noninterest expense |  | 175,416 |  |  | 164,499 |  |  | 169,121 |  |  | 153,073 |
Income before income taxes |  | 174,127 |  |  | 175,284 |  |  | 157,685 |  |  | 228,004 |
Income tax expense |  | 89,229 |  |  | 42,624 |  |  | 39,355 |  |  | 58,268 |
Net income |  | $ | 84,898 |  |  | $ | 132,660 |  |  | $ | 118,330 |  |  | $ | 169,736 |
EPS |  |  |  |  |  |  |  |
- Basic |  | $ | 0.59 |  |  | $ | 0.92 |  |  | $ | 0.82 |  |  | $ | 1.18 |
- Diluted |  | $ | 0.58 |  |  | $ | 0.91 |  |  | $ | 0.81 |  |  | $ | 1.16 |
Weighted-average number of shares outstanding |  |  |  |  |  |  |  |
- Basic |  | 144,542 |  |  | 144,498 |  |  | 144,485 |  |  | 144,249 |
- Diluted |  | 146,030 |  |  | 145,882 |  |  | 145,740 |  |  | 145,732 |
Cash dividends declared per common share |  | $ | 0.20 |  |  | $ | 0.20 |  |  | $ | 0.20 |  |  | $ | 0.20 |
|  | Quarters Ended
($ and shares in thousands, except per share data) |  | December 31, |  | September 30, |  | June 30, |  | March 31,
2016 |  |  |  |  |  |  |  |
Interest and dividend income |  | $ | 302,127 |  |  | $ | 280,317 |  |  | $ | 278,865 |  |  | $ | 276,172 |
Interest expense |  | 29,425 |  |  | 26,169 |  |  | 25,281 |  |  | 23,968 |
Net interest income before provision for credit losses |  | 272,702 |  |  | 254,148 |  |  | 253,584 |  |  | 252,204 |
Provision for credit losses |  | 10,461 |  |  | 9,525 |  |  | 6,053 |  |  | 1,440 |
Net interest income after provision for credit losses |  | 262,241 |  |  | 244,623 |  |  | 247,531 |  |  | 250,764 |
Noninterest income |  | 48,800 |  |  | 49,341 |  |  | 44,264 |  |  | 40,513 |
Noninterest expense |  | 149,904 |  |  | 170,500 |  |  | 148,879 |  |  | 146,606 |
Income before income taxes |  | 161,137 |  |  | 123,464 |  |  | 142,916 |  |  | 144,671 |
Income tax expense |  | 50,403 |  |  | 13,321 |  |  | 39,632 |  |  | 37,155 |
Net income |  | $ | 110,734 |  |  | $ | 110,143 |  |  | $ | 103,284 |  |  | $ | 107,516 |
EPS |  |  |  |  |  |  |  |
- Basic |  | $ | 0.77 |  |  | $ | 0.76 |  |  | $ | 0.72 |  |  | $ | 0.75 |
- Diluted |  | $ | 0.76 |  |  | $ | 0.76 |  |  | $ | 0.71 |  |  | $ | 0.74 |
Weighted-average number of shares outstanding |  |  |  |  |  |  |  |
- Basic |  | 144,166 |  |  | 144,122 |  |  | 144,101 |  |  | 143,958 |
- Diluted |  | 145,428 |  |  | 145,238 |  |  | 145,078 |  |  | 144,803 |
Cash dividends declared per common share |  | $ | 0.20 |  |  | $ | 0.20 |  |  | $ | 0.20 |  |  | $ | 0.20 |

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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