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Derivative Instruments (Change In Fair Value Of Derivative Instruments) (Details) - Non-hedging interest rate derivatives: - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Other Assets | Other Income | Customer Back-to-Back Swap Program |  |
Derivatives, Fair Value [Line Items] |  |
Change in Fair Value Non-Hedging Interest Rate Derivatives: |  | $ 37,911
Other Assets | Other Expense | Customer Back-to-Back Swap Program |  |
Derivatives, Fair Value [Line Items] |  |
Change in Fair Value Non-Hedging Interest Rate Derivatives: | $ (22,994) |
Other Liabilities | Other Income | Customer Back-to-Back Swap Program |  |
Derivatives, Fair Value [Line Items] |  |
Change in Fair Value Non-Hedging Interest Rate Derivatives: |  | (37,911)
Other Liabilities | Other Expense |  |
Derivatives, Fair Value [Line Items] |  |
Change in Fair Value Non-Hedging Interest Rate Derivatives: | 385 | $ 172
Other Liabilities | Other Expense | Customer Back-to-Back Swap Program |  |
Derivatives, Fair Value [Line Items] |  |
Change in Fair Value Non-Hedging Interest Rate Derivatives: | $ 22,994 |

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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