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INVESTMENT SECURITIES (Details 5) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Scheduled maturities of investment securities available-for sale, amortized cost basis    
Due within one year $ 343,193,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year through five years 1,018,469,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five years through ten years 328,317,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years 929,226,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Total investment securities available-for-sale 2,619,205,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Scheduled maturities of investment securities available-for sale, estimated fair value    
Due within one year 339,814,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years 1,022,566,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through ten years 329,172,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 934,813,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Fair Value 2,626,365,000us-gaap_AvailableForSaleSecurities 2,733,797,000us-gaap_AvailableForSaleSecurities
Par value of securities pledged to secure public deposits $ 1,930,000,000us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments $ 1,970,000,000us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments