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INVESTMENTS IN QUALIFIED AFFORDABLE HOUSING PARTNERSHIPS, TAX CREDIT AND OTHER INVESTMENTS, NET (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Impact of new accounting guidance |  |  |  |  |  |  |  |
Investments in qualified affordable housing partnerships, net | $ 176,566 |  |  | $ 176,566 |  |  | $ 178,962 | [1]
Other assets - Deferred tax assets |  |  |  |  |  |  | 389,601 |
Retained earnings | 1,744,955 |  |  | 1,744,955 |  |  | 1,604,141 | [1]
Noninterest expense - Amortization of tax credit and other investments | 2,997 | $ 5,490 | [1] | 9,296 | $ 6,982 | [1] |  |
Income before income taxes | 144,421 | 122,966 | [1] | 291,247 | 239,129 | [1] |  |
Income tax expense | 45,673 | 38,661 | [1] | 92,472 | 80,653 | [1] |  |
Net income | $ 98,748 | $ 84,305 | [1] | $ 198,775 | $ 158,476 | [1] |  |
EARNINGS PER SHARE |  |  |  |  |  |  |  |
BASIC (in dollars per share) | $ 0.69 | $ 0.59 | [1] | $ 1.38 | $ 1.11 | [1] |  |
DILUTED (in dollars per share) | $ 0.68 | $ 0.59 | [1] | $ 1.38 | $ 1.11 | [1] |  |
Previously Reported |  |  |  |  |  |  |  |
Impact of new accounting guidance |  |  |  |  |  |  |  |
Investments in qualified affordable housing partnerships, net |  |  |  |  |  |  | 178,652 |
Other assets - Deferred tax assets |  |  |  |  |  |  | 384,367 |
Retained earnings |  |  |  |  |  |  | $ 1,598,598 |
Noninterest expense - Amortization of tax credit and other investments |  | $ 12,851 |  |  | $ 18,815 |  |  |
Income before income taxes |  | 115,606 |  |  | 227,296 |  |  |
Income tax expense |  | 31,618 |  |  | 66,567 |  |  |
Net income |  | $ 83,988 |  |  | $ 160,729 |  |  |
EARNINGS PER SHARE |  |  |  |  |  |  |  |
BASIC (in dollars per share) |  | $ 0.59 |  |  | $ 1.13 |  |  |
DILUTED (in dollars per share) |  | $ 0.58 |  |  | $ 1.12 |  |  |
[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 Accounting Standards Update ("ASU") 2014-01. See Note 10 of the Notes to Consolidated Financial Statements for additional information.

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