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PARENT COMPANY CONDENSED FINANCIAL STATEMENTS (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of income |  |  |  |  |  |  |  |  |  |  |
Interest expense | $ 27,647 us-gaap_InterestExpense | $ 28,974 us-gaap_InterestExpense | $ 27,992 us-gaap_InterestExpense | $ 28,207 us-gaap_InterestExpense | $ 28,195 us-gaap_InterestExpense | $ 27,456 us-gaap_InterestExpense | $ 27,709 us-gaap_InterestExpense | $ 29,132 us-gaap_InterestExpense | $ 112,820 us-gaap_InterestExpense | $ 112,492 us-gaap_InterestExpense | $ 132,168 us-gaap_InterestExpense
Compensation and net occupancy reimbursement to subsidiary |  |  |  |  |  |  |  |  | 63,815 us-gaap_OccupancyNet | 56,641 us-gaap_OccupancyNet | 55,475 us-gaap_OccupancyNet
Other expense |  |  |  |  |  |  |  |  | 92,359 us-gaap_OtherNoninterestExpense | 77,576 us-gaap_OtherNoninterestExpense | 80,582 us-gaap_OtherNoninterestExpense
Income before income taxes and equity in undistributed income of subsidiaries | 113,047 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 75,112 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 115,606 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 111,690 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 98,564 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 108,906 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 111,870 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 106,510 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 415,455 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 425,850 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 425,592 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit | (20,049)us-gaap_IncomeTaxExpenseBenefit | 13,644 us-gaap_IncomeTaxExpenseBenefit | (31,618)us-gaap_IncomeTaxExpenseBenefit | (34,949)us-gaap_IncomeTaxExpenseBenefit | (22,782)us-gaap_IncomeTaxExpenseBenefit | (35,749)us-gaap_IncomeTaxExpenseBenefit | (37,855)us-gaap_IncomeTaxExpenseBenefit | (34,419)us-gaap_IncomeTaxExpenseBenefit | (72,972)us-gaap_IncomeTaxExpenseBenefit | (130,805)us-gaap_IncomeTaxExpenseBenefit | (143,942)us-gaap_IncomeTaxExpenseBenefit
NET INCOME | 92,998 us-gaap_NetIncomeLoss | 88,756 us-gaap_NetIncomeLoss | 83,988 us-gaap_NetIncomeLoss | 76,741 us-gaap_NetIncomeLoss | 75,782 us-gaap_NetIncomeLoss | 73,157 us-gaap_NetIncomeLoss | 74,015 us-gaap_NetIncomeLoss | 72,091 us-gaap_NetIncomeLoss | 342,483 us-gaap_NetIncomeLoss | 295,045 us-gaap_NetIncomeLoss | 281,650 us-gaap_NetIncomeLoss
Parent Company |  |  |  |  |  |  |  |  |  |  |
Statement of income |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 111,701 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 319,085 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 324,094 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income |  |  |  |  |  |  |  |  | 7,414 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 821 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total income |  |  |  |  |  |  |  |  | 119,115 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 319,906 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 324,096 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  | 4,823 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,436 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,092 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Compensation and net occupancy reimbursement to subsidiary |  |  |  |  |  |  |  |  | 4,039 us-gaap_OccupancyNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,662 us-gaap_OccupancyNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,573 us-gaap_OccupancyNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expense |  |  |  |  |  |  |  |  | 50,280 us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12,677 us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,309 us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expense |  |  |  |  |  |  |  |  | 59,142 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 19,775 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,974 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income taxes and equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 59,973 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 300,131 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 317,122 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit |  |  |  |  |  |  |  |  | 80,674 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22,885 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,892 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 201,836 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (27,971)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (38,364)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
NET INCOME |  |  |  |  |  |  |  |  | $ 342,483 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 295,045 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 281,650 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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