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QUARTERLY FINANCIAL INFORMATION (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
QUARTERLY FINANCIAL INFORMATION (unaudited) |  |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income | $ 293,203 | $ 281,706 | $ 255,353 | $ 238,423 | $ 276,521 | $ 254,162 | $ 266,362 | $ 254,050 | $ 1,068,685 | $ 1,051,095 |  | $ 1,080,448
Interest expense | 28,195 | 27,456 | 27,709 | 29,132 | 31,577 | 32,254 | 33,205 | 35,132 | 112,492 | 132,168 |  | 177,422
Net interest income | 265,008 | 254,250 | 227,644 | 209,291 | 244,944 | 221,908 | 233,157 | 218,918 | 956,193 | 918,927 |  | 903,026
Provision for (reversal of) loan losses, excluding covered loans | 6,286 | 4,535 | 8,277 | (762) | 13,773 | 13,321 | 16,595 | 16,479 | 17,780 | 64,912 |  |
Provision for loan losses on covered loans | (820) | (964) | 723 | 5,089 | (689) | 5,179 | (1,095) | 1,621 | 4,028 | 5,016 |  | 2,422
Net interest income after provision for loan losses | 259,542 | 250,679 | 218,644 | 204,964 | 231,860 | 203,408 | 217,657 | 200,818 | 933,829 | 853,743 |  | 808,020
Noninterest (loss) income | (36,594) | (41,421) | (12,354) | (2,099) | (18,454) | 2,751 | (11,655) | 21,740 | (92,468) | (5,618) |  | 10,924
Noninterest expense | 124,384 | 100,352 | 94,420 | 96,355 | 105,206 | 100,956 | 101,608 | 114,763 | 415,511 | 422,533 |  | 435,610
Income before provision for income taxes | 98,564 | 108,906 | 111,870 | 106,510 | 108,200 | 105,203 | 104,394 | 107,795 | 425,850 | 425,592 |  | 383,334
Provision for income taxes | 22,782 | 35,749 | 37,855 | 34,419 | 36,300 | 34,093 | 33,837 | 39,712 | 130,805 | 143,942 |  | 138,100
Net income | 75,782 | 73,157 | 74,015 | 72,091 | 71,900 | 71,110 | 70,557 | 68,083 | 295,045 | 281,650 |  | 245,234
Preferred stock dividends |  |  | 1,714 | 1,714 | 1,715 | 1,714 | 1,714 | 1,714 | 3,428 | 6,857 |  | 6,857
Net income available to common stockholders | $ 75,782 | $ 73,157 | $ 72,301 | $ 70,377 | $ 70,185 | $ 69,396 | $ 68,843 | $ 66,369 | $ 291,617 | $ 274,793 |  | $ 238,377
Basic earnings per share | $ 0.55 | $ 0.53 | $ 0.52 | $ 0.51 | $ 0.50 | $ 0.49 | $ 0.48 | $ 0.46 | $ 2.11 | $ 1.92 | [1] | $ 1.62
Diluted earnings per share | $ 0.55 | $ 0.53 | $ 0.52 | $ 0.50 | $ 0.49 | $ 0.48 | $ 0.47 | $ 0.45 | $ 2.10 | $ 1.89 | [1] | $ 1.60
[1] | On April 1, 2012, the Company revised its calculation of earnings per share to account for participating securities under the two-class method. This revision to the earnings per share calculation does not have an impact to previous periods as the amounts are immaterial.

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