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Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instruments - 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] |  |  |
Total Derivative (Loss)/Gain | $ (116) | $ 230 | $ 58
Interest Rate Swap Contracts—Commercial Loans |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total Derivative (Loss)/Gain | (132) | 145 | 17
Interest Rate Lock Commitments—Mortgage Loans |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total Derivative (Loss)/Gain | 70 | 25 | (11)
Forward Sale Contracts—Mortgage Loans |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total Derivative (Loss)/Gain | $ (54) | $ 60 | $ 52

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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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