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Derivatives (Effects of Derivative Instruments on the Statements of Income) (Details) - Interest Rate Swaps Designated as Hedges [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative income reflected in income statement | $ 3,140 | $ (638) | $ 2,424 | $ 262
Other Noninterest Income [Member] | All Other Instruments [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative income reflected in income statement | 4,324 | 1,363 | 8,733 | 4,474
Cash Flow Hedge [Member] | Interest Income [Member] | Variable Rate Loans [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative income reflected in income statement | (956) | (1,276) | (4,632) | (2,841)
Fair Value Hedging [Member] | Interest Income [Member] | Securities [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative income reflected in income statement | 15 |  | 15 |
Fair Value Hedging [Member] | Interest Expense [Member] | Brokered Deposits [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative income reflected in income statement | $ (243) | $ (725) | $ (1,692) | $ (1,371)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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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