Derivatives and Hedging Activities Derivatives not designated as hedges, effect on statement of operations (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ (87)	$ 258
Interest rate products
Derivative Instruments, Gain (Loss) [Line Items]
Total	(191)	92
Risk participation agreements
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ 104	$ 166