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INVESTMENT SECURITIES (Details 2) (USD $) | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 Available-for-sale Securities | Jun. 30, 2011 Available-for-sale Securities | Mar. 31, 2012 Available-for-sale Securities | Mar. 31, 2011 Available-for-sale Securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ 115,412,000 | $ 124,340,000 | $ 115,511,000 | $ 115,243,000
Additional increases to the amount related to the credit loss for which an other-than-temporary impairment was previously recognized |  |  |  |  | 99,000 | 464,000 |  |
Reduction for securities sold |  |  |  |  |  | (9,561,000) |  |
Ending balance |  |  |  |  | 115,511,000 | 115,243,000 | 115,511,000 | 115,243,000
Gross gains on sale of investment securities | 26,300,000 | 1,700,000 | 28,000,000 | 11,900,000 |  |  |  |
Gross losses on sale of investment securities | 26,200,000 | 563,000 | 27,400,000 | 8,300,000 |  |  |  |
Net income statement impact of gain on sale of investment securities | 71,000 | 1,100,000 | 554,000 | 3,600,000 |  |  |  |
Net proceeds for sales of investment securities | $ 837,000,000 | $ 215,000,000 | $ 1,100,000,000 | $ 527,800,000 |  |  |  |

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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