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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative income reflected in income statement | $ 6,952 | $ (1,472) | $ 6,419
Other Noninterest Income [Member] | All Other Instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative income reflected in income statement | 12,958 | 5,368 | 5,870
Fair Value Hedging [Member] | Interest Income [Member] | Securities [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative income reflected in income statement | 1 |  |
Fair Value Hedging [Member] | Interest Expense [Member] | Brokered Deposits [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative income reflected in income statement | (1,752) | (2,343) | 829
Cash Flow Hedge [Member] | Interest Income [Member] | Variable Rate Loans [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative income reflected in income statement | $ (4,255) | $ (4,497) | $ (280)

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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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