Derivatives (Offsetting Derivatives Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative Assets
Derivatives assets, net amounts of assets presented in the statement of financial position	$ 84,090	$ 49,484
Interest Rate Swap
Derivative Assets
Derivative assets, gross amounts of recognized assets	75,271	42,276
Derivative asset, fair value, gross liability	0	0
Derivatives assets, net amounts of assets presented in the statement of financial position	75,271	42,276
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative assets, gross amounts not offset in the statement of financial position, financial instruments	(7,717)	(12,746)
Derivative assets, gross amounts not offset in the statement of financial position, collateral posted	0	0
Derivative assets, net amount	67,554	29,530
Foreign currency derivative
Derivative Assets
Derivative assets, gross amounts of recognized assets	617	450
Derivative asset, fair value, gross liability	0	0
Derivatives assets, net amounts of assets presented in the statement of financial position	617	450
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	$ 617	$ 450