Derivative Instruments and Hedging Activities - Gains (Losses) on Interest Rate Derivatives Designated as Fair Value Hedges (Details) - Fair value hedge - Interest income - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest rate swaps
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Gain (loss) related to derivative interest rate swaps	$ 73	$ 75	$ 292	$ 224
Loans \| Derivatives designated as hedging instruments
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Gain (loss) related to hedged loans	$ (73)	$ (75)	$ (292)	$ (224)

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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