Derivatives (Offsetting Derivatives Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative Liabilities
Total liability derivatives	$ 39,893	$ 9,288
Interest Rate Swap
Derivative Liabilities
Derivative liabilities, gross amounts of recognized liabilities	39,303	7,229
Derivative liability, fair value, gross asset	0	0
Total liability derivatives	39,303	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	(10,890)	(7,229)
Derivative liabilities, gross amounts not offset in the statement of financial position, collateral posted	0	0
Derivative liabilities, net amount	28,413	0
Foreign Exchange Contract
Derivative Liabilities
Derivative liabilities, gross amounts of recognized liabilities	513	1,492
Derivative liability, fair value, gross asset	0	0
Total liability derivatives	513	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	$ 513	$ 1,492