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Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | $ 9,019,788 | $ 7,059,674
Investment securities available for sale | 9,019,788 | 7,059,674
Investment in marketable equity securities | 93,074 | 82,333
Loans held for sale | 120,305 | 67,869
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 9,019,788 |
Investment securities available for sale |  | 7,059,674
Loans held for sale | 120,305 | 67,869
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 | 0 | 0
Loans held for sale | 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] |  |
Debt Securities, Available-for-sale | 8,769,074 |
Investment securities available for sale |  | 6,989,989
Loans held for sale | 120,305 | 67,869
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale | 250,714 | 69,685
Loans held for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. Treasury |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 654,762 |
Investment securities available for sale |  | 409,999
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] |  |
Debt Securities, Available-for-sale | 0 |
Investment securities available for sale |  | 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] |  |
Debt Securities, Available-for-sale | 654,762 |
Investment securities available for sale |  | 409,999
Fair Value, Measurements, Recurring | U.S. Treasury | Significant Unobservable Inputs (Level 3 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 0 |
Investment securities available for sale |  | 0
Fair Value, Measurements, Recurring | Agency Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 654,941 |
Investment securities available for sale |  | 682,772
Fair Value, Measurements, Recurring | Agency 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] |  |
Debt Securities, Available-for-sale | 0 |
Investment securities available for sale |  | 0
Fair Value, Measurements, Recurring | Agency Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 654,941 |
Investment securities available for sale |  | 682,772
Fair Value, Measurements, Recurring | Agency Securities | Significant Unobservable Inputs (Level 3 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 0 |
Investment securities available for sale |  | 0
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 1,090,210 |
Investment securities available for sale |  | 380,020
Fair Value, Measurements, Recurring | Commercial Mortgage Backed 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] |  |
Debt Securities, Available-for-sale | 0 |
Investment securities available for sale |  | 0
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 1,090,210 |
Investment securities available for sale |  | 380,020
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities | Significant Unobservable Inputs (Level 3 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 0 |
Investment securities available for sale |  | 0
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 6,069,668 |
Investment securities available for sale |  | 5,267,090
Fair Value, Measurements, Recurring | Residential Mortgage Backed 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] |  |
Debt Securities, Available-for-sale | 0 |
Investment securities available for sale |  | 0
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 6,069,668 |
Investment securities available for sale |  | 5,267,090
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities | Significant Unobservable Inputs (Level 3 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 0 |
Investment securities available for sale |  | 0
Fair Value, Measurements, Recurring | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in marketable equity securities | 93,074 | 82,333
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 in marketable equity securities | 38,192 | 29,458
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 in marketable equity securities | 54,882 | 52,875
Fair Value, Measurements, Recurring | Equity Securities | Significant Unobservable Inputs (Level 3 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in marketable equity securities | 0 | 0
Fair Value, Measurements, Recurring | Corporate Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 550,207 |
Investment securities available for sale |  | 201,566
Fair Value, Measurements, Recurring | Corporate Bonds | 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] |  |
Debt Securities, Available-for-sale | 0 |
Investment securities available for sale |  | 0
Fair Value, Measurements, Recurring | Corporate Bonds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | 299,493 |
Investment securities available for sale |  | 131,881
Fair Value, Measurements, Recurring | Corporate Bonds | Significant Unobservable Inputs (Level 3 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale | $ 250,714 |
Investment securities available for sale |  | 69,685
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale |  | 118,227
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities [Member] | 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 | US States and Political Subdivisions Debt Securities [Member] | 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 |  | 118,227
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities [Member] | Significant Unobservable Inputs (Level 3 Inputs) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available for sale |  | $ 0

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