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QUARTERLY FINANCIAL INFORMATION (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information (unaudited) |
|  | Quarters Ended
($ in thousands, except per share data) |  | December 31, |  | September 30, |  | June 30, |  | March 31,
2015 |  |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income |  | $ | 270,477 |  |  | $ | 264,632 |  |  | $ | 255,445 |  |  | $ | 263,261 |
Interest expense |  | 23,536 |  |  | 24,343 |  |  | 27,953 |  |  | 27,544 |
Net interest income before (reversal of) provision for credit losses |  | 246,941 |  |  | 240,289 |  |  | 227,492 |  |  | 235,717 |
(Reversal of) provision for credit losses |  | (2,000 | ) |  | 7,736 |  |  | 3,494 |  |  | 4,987 |
Net interest income after (reversal of) provision for credit losses |  | 248,941 |  |  | 232,553 |  |  | 223,998 |  |  | 230,730 |
Noninterest income |  | 44,483 |  |  | 54,181 |  |  | 40,593 |  |  | 44,126 |
Noninterest expense |  | 144,939 |  |  | 147,745 |  |  | 120,170 |  |  | 128,030 |
Income before taxes |  | 148,485 |  |  | 138,989 |  |  | 144,421 |  |  | 146,826 |
Income tax expense |  | 56,680 |  |  | 44,892 |  |  | 45,673 |  |  | 46,799 |
Net income |  | $ | 91,805 |  |  | $ | 94,097 |  |  | $ | 98,748 |  |  | $ | 100,027 |
Earnings per share |  |  |  |  |  |  |  |
Basic |  | $ | 0.64 |  |  | $ | 0.65 |  |  | $ | 0.69 |  |  | $ | 0.70 |
Diluted |  | $ | 0.63 |  |  | $ | 0.65 |  |  | $ | 0.68 |  |  | $ | 0.69 |
Weighted average number of shares outstanding (in thousands) |  |  |  |  |  |  |  |
Basic |  | 143,900 |  |  | 143,861 |  |  | 143,846 |  |  | 143,655 |
Diluted |  | 144,686 |  |  | 144,590 |  |  | 144,480 |  |  | 144,349 |
Dividends declared per common share |  | $ | 0.20 |  |  | $ | 0.20 |  |  | $ | 0.20 |  |  | $ | 0.20 |
|  | Quarters Ended
($ in thousands, except per share data) |  | December 31, |  | September 30, |  | June 30, |  | March 31,
2014 |  |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income |  | $ | 287,135 |  |  | $ | 285,948 |  |  | $ | 294,442 |  |  | $ | 286,173 |
Interest expense |  | 27,647 |  |  | 28,974 |  |  | 27,992 |  |  | 28,207 |
Net interest income before provision for credit losses |  | 259,488 |  |  | 256,974 |  |  | 266,450 |  |  | 257,966 |
Provision for credit losses |  | 19,000 |  |  | 15,225 |  |  | 8,000 |  |  | 6,933 |
Net interest income after provision for credit losses |  | 240,488 |  |  | 241,749 |  |  | 258,450 |  |  | 251,033 |
Noninterest income (loss) |  | 7,805 |  |  | 10,342 |  |  | (14,945 | ) |  | (14,916 | )
Noninterest expense (1) |  | 125,698 |  |  | 166,792 |  |  | 120,539 |  |  | 119,954 |
Income before taxes (1) |  | 122,595 |  |  | 85,299 |  |  | 122,966 |  |  | 116,163 |
Income tax expense (benefit) (1) |  | 27,093 |  |  | (6,601 | ) |  | 38,661 |  |  | 41,992 |
Net income (1) |  | $ | 95,502 |  |  | $ | 91,900 |  |  | $ | 84,305 |  |  | $ | 74,171 |
Earnings per share |  |  |  |  |  |  |  |
Basic (1) |  | $ | 0.67 |  |  | $ | 0.64 |  |  | $ | 0.59 |  |  | $ | 0.52 |
Diluted (1) |  | $ | 0.66 |  |  | $ | 0.64 |  |  | $ | 0.59 |  |  | $ | 0.52 |
Weighted average number of shares outstanding (in thousands) |  |  |  |  |  |  |  |
Basic |  | 143,432 |  |  | 143,210 |  |  | 143,187 |  |  | 141,962 |
Diluted |  | 144,116 |  |  | 143,810 |  |  | 143,689 |  |  | 142,632 |
Dividends declared per common share |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |
(1) | Prior periods were restated to reflect the retrospective application of adopting the new accounting guidance related to the Company’s investments in qualified affordable housing projects ASU 2014-01. Please see Note 9 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net to the Consolidated Financial Statements for additional information.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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