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Derivative Instruments and Hedging Activities (Effect of Derivative Instruments on the Income Statement) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income | $ (377) | $ 1,931 | $ 1,660 | $ 4,617
Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income | 377 | 1,931 | 1,660 | 4,617
Interest Rate Swap [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Income from Derivative Instruments, Net [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income | 248 | 1,310 | 1,687 | 3,715
Credit Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Income from Derivative Instruments, Net [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income | 38 | 13 | 74 | 136
Mortgage Banking [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Income from Derivative Instruments, Net [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) recognized in income | $ 91 | $ 608 | $ (101) | $ 766

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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=125515794&loc=SL5618551-113959 + Details
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