Derivatives (Offsetting Derivatives Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative Assets
Derivatives assets, net amounts of assets presented in the statement of financial position	$ 42,028	$ 47,501
Interest Rate Swap
Derivative Assets
Derivative assets, gross amounts of recognized assets	35,280	34,701
Derivative asset, fair value, gross liability	0	0
Derivatives assets, net amounts of assets presented in the statement of financial position	35,280	34,701
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative assets, gross amounts not offset in the statement of financial position, financial instruments	(4,348)	(11,225)
Derivative assets, gross amounts not offset in the statement of financial position, collateral posted	0	0
Derivative assets, net amount	30,932	23,476
Foreign Exchange Contract
Derivative Assets
Derivative assets, gross amounts of recognized assets	210	670
Derivative asset, fair value, gross liability	0	0
Derivatives assets, net amounts of assets presented in the statement of financial position	210	670
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative assets, gross amounts not offset in the statement of financial position, financial instruments	0	0
Derivative assets, gross amounts not offset in the statement of financial position, collateral posted	0	0
Derivative assets, net amount	$ 210	$ 670