Derivatives (Offsetting Derivatives Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivative Assets
Derivatives assets, net amounts of assets presented in the statement of financial position	$ 34,029	$ 47,501
Interest Rate Swap
Derivative Assets
Derivative assets, gross amounts of recognized assets	27,368	34,701
Derivative asset, fair value, gross liability	0	0
Derivatives assets, net amounts of assets presented in the statement of financial position	27,368	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	(6,333)	(11,225)
Derivative assets, gross amounts not offset in the statement of financial position, collateral posted	0	0
Derivative assets, net amount	21,035	23,476
Foreign Exchange Contract
Derivative Assets
Derivative assets, gross amounts of recognized assets	289	670
Derivative asset, fair value, gross liability	0	0
Derivatives assets, net amounts of assets presented in the statement of financial position	289	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	$ 289	$ 670