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Derivative and Hedging Activities - Gains and Losses on Derivatives (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivatives Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) recognized in Income on derivatives | $ (920) | $ (117) | $ (351)
Derivatives Not Designated as Hedging Instrument | Interest Rate Products | Other Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) recognized in Income on derivatives | (950) | (64) | (414)
Derivatives Not Designated as Hedging Instrument | Credit Risk Contract | Other Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) recognized in Income on derivatives | 30 | (53) | 63
Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) recognized in Income on derivatives | 1,741 | (624) | 312
Designated as Hedging Instrument | Interest Rate Products | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) recognized in Income on derivatives | $ 1,741 | $ (624) | $ 312

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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=121590274&loc=SL5618551-113959 + Details
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