Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Other Assets
Derivatives (included in Other Assets)
Gross amounts recognized		$ 8,733	$ 4,974
Gross amounts offset		(3,229)	(1,900)
Net amounts presented in the Consolidated Balance Sheets		5,504	3,074
Gross amounts not offset	[1]	(160)	0
Net Amount		5,344	3,074
Other Liabilities
Derivatives (included in Other Liabilities)
Gross amounts recognized		8,569	4,955
Gross amounts offset		(3,229)	(1,900)
Net amounts presented in the Consolidated Balance Sheets		5,340	3,055
Gross amounts not offset	[1]	0	(1,448)
Net Amount		$ 5,340	$ 1,607

[1] Amounts represent collateral received for the periods presented.