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Derivatives (Effects of Derivative Instruments on the Statements of Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative income reflected in income statement | $ (1,472) | $ 6,419 | $ 7,506
Other NonInterest Income [Member] | All Other Instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative income reflected in income statement | 5,368 | 5,870 | 5,196
Cash Flow Hedge [Member] | Interest Income [Member] | Interest Rate Swaps [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative income reflected in income statement | (4,497) | (280) | $ 2,310
Fair Value Hedging [Member] | Interest Expense [Member] | Interest Rate Swaps [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative income reflected in income statement | $ (2,343) | $ 829 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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