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QUARTERLY FINANCIAL INFORMATION (unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income | $ 270,477 | $ 264,632 | $ 255,445 | $ 263,261 | $ 287,135 | $ 285,948 | $ 294,442 | $ 286,173 | $ 1,053,815 |  | $ 1,153,698 |  | $ 1,068,685 |
Interest expense | 23,536 | 24,343 | 27,953 | 27,544 | 27,647 | 28,974 | 27,992 | 28,207 | 103,376 |  | 112,820 |  | 112,492 |
Net interest income before provision for credit losses | 246,941 | 240,289 | 227,492 | 235,717 | 259,488 | 256,974 | 266,450 | 257,966 | 950,439 |  | 1,040,878 |  | 956,193 |
(Reversal of) provision for credit losses | (2,000) | 7,736 | 3,494 | 4,987 | 19,000 | 15,225 | 8,000 | 6,933 | 14,217 |  | 49,158 |  | 22,364 |
Net interest income after provision for credit losses | 248,941 | 232,553 | 223,998 | 230,730 | 240,488 | 241,749 | 258,450 | 251,033 | 936,222 |  | 991,720 |  | 933,829 |
Noninterest income (loss) | 44,483 | 54,181 | 40,593 | 44,126 | 7,805 | 10,342 | (14,945) | (14,916) | 183,383 |  | (11,714) |  | (92,468) |
Noninterest expense | 144,939 | 147,745 | 120,170 | 128,030 | 125,698 | 166,792 | 120,539 | 119,954 | 540,884 | [1] | 532,983 | [1] | 394,215 | [1]
Income before income taxes | 148,485 | 138,989 | 144,421 | 146,826 | 122,595 | 85,299 | 122,966 | 116,163 | 578,721 | [1] | 447,023 | [1] | 447,146 | [1]
INCOME TAX EXPENSE | 56,680 | 44,892 | 45,673 | 46,799 | 27,093 | (6,601) | 38,661 | 41,992 | 194,044 | [1] | 101,145 | [1] | 153,822 | [1]
NET INCOME | $ 91,805 | $ 94,097 | $ 98,748 | $ 100,027 | $ 95,502 | $ 91,900 | $ 84,305 | $ 74,171 | $ 384,677 | [1] | $ 345,878 | [1] | $ 293,324 | [1]
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
BASIC (in dollars per share) | $ 0.64 | $ 0.65 | $ 0.69 | $ 0.70 | $ 0.67 | $ 0.64 | $ 0.59 | $ 0.52 | $ 2.67 | [1] | $ 2.42 | [1] | $ 2.10 | [1]
DILUTED (in dollars per share) | $ 0.63 | $ 0.65 | $ 0.68 | $ 0.69 | $ 0.66 | $ 0.64 | $ 0.59 | $ 0.52 | $ 2.66 | [1] | $ 2.41 | [1] | $ 2.09 | [1]
Basic weighted-average common shares outstanding (in shares) | 143,900 | 143,861 | 143,846 | 143,655 | 143,432 | 143,210 | 143,187 | 141,962 | 143,818 |  | 142,952 |  | 137,342 |
Diluted average common shares outstanding (in shares) | 144,686 | 144,590 | 144,480 | 144,349 | 144,116 | 143,810 | 143,689 | 142,632 | 144,512 |  | 143,563 |  | 139,574 |
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.80 |  | $ 0.72 |  | $ 0.60 |
[1] | Prior period was restated to reflect the retrospective application of adopting the new accounting guidance related to the Company’s investments in qualified affordable housing projects Accounting Standards Update (“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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