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v2.4.1.9

Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Investment securities available for sale |  |
Cost | $ 7,011,477 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 7,163,574 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains | 39,354 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 20,589 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses | 5,722 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | 12,246 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair Value | 7,045,109 us-gaap_AvailableForSaleSecurities | 7,171,917 us-gaap_AvailableForSaleSecurities
Investment securities held to maturity |  |
Cost | 441 us-gaap_HeldToMaturitySecurities | 518 us-gaap_HeldToMaturitySecurities
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 2,237,002 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 2,626,900 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Gross Unrealized Gains | 9,966 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 2,922 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Gross Unrealized Losses | 2 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 152 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Fair Value | 2,246,966 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember | 2,629,670 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Government Agency |  |
Investment securities available for sale |  |
Cost | 988,563 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember | 908,362 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
Gross Unrealized Gains | 2,382 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember | 702 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
Gross Unrealized Losses | 51 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember | 247 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
Fair Value | 990,894 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember | 908,817 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
Mortgage Backed Securities, Other [Member] |  |
Investment securities available for sale |  |
Cost | 3,785,912 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember | 3,628,187 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Gross Unrealized Gains | 27,006 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember | 16,964 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Gross Unrealized Losses | 5,669 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember | 11,847 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Fair Value | 3,807,249 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember | 3,633,304 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Investment securities held to maturity |  |
Cost | 441 us-gaap_HeldToMaturitySecurities / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember | 518 us-gaap_HeldToMaturitySecurities / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 18 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember | 26 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
Fair Value | 459 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember | 544 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember
State, County and Municipal |  |
Investment securities available for sale |  |
Cost |  | 125 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Gross Unrealized Gains |  | 1 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Gross Unrealized Losses |  | 0 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Fair Value |  | $ 126 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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