Derivative and Hedging Activities - Gains and Losses on Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivatives Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	$ (117)	$ (351)	$ (420)
Derivatives Not Designated as Hedging Instrument | Interest Rate Products | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	(64)	(414)	(422)
Derivatives Not Designated as Hedging Instrument | Credit Risk Contract | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	(53)	63	2
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	158	312	(205)
Designated as Hedging Instrument | Interest Rate Products | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	$ 158	$ 312	$ (205)