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Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | $ 6,861,293 | $ 7,171,917
Loans held for sale | 59,766 | 63,696
Fair Value, Measurements, Recurring | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 6,861,293 | 7,171,917
Loans held for sale | 59,766 |
Interest rate swaps accounted for as cash flow hedges | 1,429 | 4,337
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 1,668 | 0
Loans held for sale | 0 |
Interest rate swaps accounted for as cash flow hedges | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 6,859,625 | 7,171,917
Loans held for sale | 59,766 |
Interest rate swaps accounted for as cash flow hedges | 1,429 | 4,337
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 0 | 0
Loans held for sale | 0 |
Interest rate swaps accounted for as cash flow hedges | 0 | 0
Fair Value, Measurements, Recurring | U.S. Treasury | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 1,674,882 | 2,629,670
Fair Value, Measurements, Recurring | U.S. Treasury | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. Treasury | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 1,674,882 | 2,629,670
Fair Value, Measurements, Recurring | U.S. Treasury | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Government Agency | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 498,660 | 908,817
Fair Value, Measurements, Recurring | Government Agency | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Government Agency | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 498,660 | 908,817
Fair Value, Measurements, Recurring | Government Agency | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 4,668,198 | 3,633,304
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 4,668,198 | 3,633,304
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Other Debt Obligations | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 10,660 |
Fair Value, Measurements, Recurring | Other Debt Obligations | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 0 |
Fair Value, Measurements, Recurring | Other Debt Obligations | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 10,660 |
Fair Value, Measurements, Recurring | Other Debt Obligations | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 0 |
Fair Value, Measurements, Recurring | Equity Securities | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 8,893 |
Fair Value, Measurements, Recurring | Equity Securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 1,668 |
Fair Value, Measurements, Recurring | Equity Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 7,225 |
Fair Value, Measurements, Recurring | Equity Securities | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | $ 0 |
Fair Value, Measurements, Recurring | State, County, Municipal | Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale |  | 126
Fair Value, Measurements, Recurring | State, County, Municipal | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale |  | 0
Fair Value, Measurements, Recurring | State, County, Municipal | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale |  | 126
Fair Value, Measurements, Recurring | State, County, Municipal | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale |  | $ 0

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