Derivatives (Offsetting Derivatives Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Liabilities
Total liability derivatives	$ 22,675	$ 9,288
Interest Rate Swap
Derivative Liabilities
Derivative liabilities, gross amounts of recognized liabilities	21,424	7,229
Derivative liability, fair value, gross asset	0	0
Total liability derivatives	21,424	7,229
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative liabilities, gross amounts not offset in the statement of financial position, financial instruments	(12,206)	(7,229)
Derivative liabilities, gross amounts not offset in the statement of financial position, collateral posted	0	0
Derivative liabilities, net amount	9,218	0
Foreign Exchange Contract
Derivative Liabilities
Derivative liabilities, gross amounts of recognized liabilities	106	1,492
Derivative liability, fair value, gross asset	0	0
Total liability derivatives	106	1,492
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative liabilities, gross amounts not offset in the statement of financial position, financial instruments	0	0
Derivative liabilities, gross amounts not offset in the statement of financial position, collateral posted	0	0
Derivative liabilities, net amount	$ 106	$ 1,492