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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 | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivatives (Loss)/Gain | $ (1) | $ 230
Interest rate swap contracts—commercial loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivatives (Loss)/Gain | (122) | 145
Interest rate lock commitments—mortgage loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivatives (Loss)/Gain | 88 | 25
Forward sale contracts—mortgage loans |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivatives (Loss)/Gain | $ 33 | $ 60

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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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