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PARENT COMPANY CONDENSED FINANCIAL STATEMENTS (Details) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 1,039,885 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 895,820 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 1,323,106 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 1,431,185 us-gaap_CashAndCashEquivalentsAtCarryingValue
Investment securities available-for-sale | 2,626,365 us-gaap_AvailableForSaleSecurities | 2,733,797 us-gaap_AvailableForSaleSecurities |  |
Other assets | 1,001,770 us-gaap_OtherAssets | 784,907 us-gaap_OtherAssets |  |
TOTAL | 28,738,049 us-gaap_Assets | 24,730,068 us-gaap_Assets | 22,536,110 us-gaap_Assets |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Long-term debt | 225,848 us-gaap_LongTermDebt | 226,868 us-gaap_LongTermDebt |  |
Total liabilities | 25,887,481 us-gaap_Liabilities | 22,365,843 us-gaap_Liabilities |  |
STOCKHOLDERS' EQUITY |  |  |  |
Common stock, $0.001 par value, 200,000,000 shares authorized; 163,772,218 and 163,098,008 shares issued in 2014 and 2013, respectively; 143,582,229 and 137,630,896 shares outstanding in 2014 and 2013, respectively. | 164 us-gaap_CommonStockValue | 163 us-gaap_CommonStockValue |  |
Common stock, par value (in dollars per share) | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |  |
Common stock, shares authorized | 200,000,000 us-gaap_CommonStockSharesAuthorized | 200,000,000 us-gaap_CommonStockSharesAuthorized |  |
Common stock, shares issued | 163,772,218 us-gaap_CommonStockSharesIssued | 163,098,008 us-gaap_CommonStockSharesIssued |  |
Common stock, shares outstanding | 143,582,229 us-gaap_CommonStockSharesOutstanding | 137,630,896 us-gaap_CommonStockSharesOutstanding |  |
Additional paid in capital | 1,677,767 us-gaap_AdditionalPaidInCapital | 1,571,670 us-gaap_AdditionalPaidInCapital |  |
Retained earnings | 1,598,598 us-gaap_RetainedEarningsAccumulatedDeficit | 1,360,130 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Treasury stock, at cost-20,189,989 shares in 2014 and 25,467,112 shares in 2013 | (430,198)us-gaap_TreasuryStockValue | (537,279)us-gaap_TreasuryStockValue |  |
Treasury stock, shares | 20,189,989 us-gaap_TreasuryStockShares | 25,467,112 us-gaap_TreasuryStockShares |  |
Accumulated other comprehensive income (loss), net of tax | 4,237 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (30,459)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 4,669 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (33,940)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity | 2,850,568 us-gaap_StockholdersEquity | 2,364,225 us-gaap_StockholdersEquity | 2,382,122 us-gaap_StockholdersEquity | 2,311,743 us-gaap_StockholdersEquity
TOTAL | 28,738,049 us-gaap_LiabilitiesAndStockholdersEquity | 24,730,068 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 211,053 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 79,934 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 64,489 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,287 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment securities available-for-sale | 8,370 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 69,796 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries | 2,841,684 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,400,937 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other investments | 41,054 us-gaap_OtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 21,371 us-gaap_OtherInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 22,474 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 37,037 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
TOTAL | 3,124,635 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,609,075 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |  |
Long-term debt | 225,848 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 226,868 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other liabilities | 48,219 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,982 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 274,067 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 244,850 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
STOCKHOLDERS' EQUITY |  |  |  |
Common stock, $0.001 par value, 200,000,000 shares authorized; 163,772,218 and 163,098,008 shares issued in 2014 and 2013, respectively; 143,582,229 and 137,630,896 shares outstanding in 2014 and 2013, respectively. | 164 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 163 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock, par value (in dollars per share) | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock, shares authorized | 200,000,000 us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 200,000,000 us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock, shares issued | 163,772,218 us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 163,098,008 us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock, shares outstanding | 143,582,229 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 137,630,896 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Additional paid in capital | 1,677,767 us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,571,670 us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 1,598,598 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,360,130 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Treasury stock, at cost-20,189,989 shares in 2014 and 25,467,112 shares in 2013 | (430,198)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (537,279)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Treasury stock, shares | 20,189,989 us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25,467,112 us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated other comprehensive income (loss), net of tax | 4,237 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (30,459)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total stockholders' equity | 2,850,568 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,364,225 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
TOTAL | $ 3,124,635 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 2,609,075 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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