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Fair Value Accounting and Measurement (Financial Assets And Liabilities Accounted for Fair Value On Recurring Basis) (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Level 1 to level 2 Transfers, Amount |  | $ 0 |  | $ 0
Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 3,367,572,000 | $ 3,167,448,000 |
Other assets (Interest rate contracts) |  | 25,045,000 | 7,033,000 |
Interest Rate Cash Flow Hedge Asset at Fair Value |  | 19,703,000 |  |
Other liabilities (Interest rate contracts) |  | 25,046,000 | 7,033,000 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 250,000 | 248,000 |
Other assets (Interest rate contracts) |  | 0 | 0 |
Interest Rate Cash Flow Hedge Asset at Fair Value |  | 0 |  |
Other liabilities (Interest rate contracts) |  | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 3,367,322,000 | 3,167,200,000 |
Other assets (Interest rate contracts) |  | 25,045,000 | 7,033,000 |
Interest Rate Cash Flow Hedge Asset at Fair Value |  | 19,703,000 |  |
Other liabilities (Interest rate contracts) |  | 25,046,000 | 7,033,000 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 0 | 0 |
Other assets (Interest rate contracts) |  | 0 | 0 |
Interest Rate Cash Flow Hedge Asset at Fair Value |  | 0 |  |
Other liabilities (Interest rate contracts) |  | 0 | 0 |
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | [1] | 2,482,835,000 | 2,013,355,000 |
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | [1] | 0 | 0 |
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | [1] | 2,482,835,000 | 2,013,355,000 |
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | [1] | 0 | 0 |
Asset-backed Securities [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | [1] | 171,578,000 | 174,935,000 |
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | [1] | 0 | 0 |
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | [1] | 171,578,000 | 174,935,000 |
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale | [1] | 0 | 0 |
State and Municipal Securities [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 497,314,000 | 574,323,000 |
State and Municipal Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 0 | 0 |
State and Municipal Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 497,314,000 | 574,323,000 |
State and Municipal Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 0 | 0 |
U.S. Government Agency [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 215,595,000 | 404,587,000 |
U.S. Government Agency [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 0 | 0 |
U.S. Government Agency [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 215,595,000 | 404,587,000 |
U.S. Government Agency [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 0 | 0 |
US Government Securities [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 250,000 | 248,000 |
US Government Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 250,000 | 248,000 |
US Government Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | 0 | 0 |
US Government Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities available for sale |  | $ 0 | $ 0 |
[1] | Beginning July 2019, other asset-backed securities were presented separately in this table. Prior period amounts that were previously reported in U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations have been reclassified to conform to current period presentation.

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