Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives [Abstract]
Gross Amounts Recognized, Derivative Assets	$ 16,167	$ 7,155
Gross Amounts Offset in the Statement of Income, Derivative Assets	(12,842)	(5,007)
Net Amounts Presented in the Statement of Income, Derivative Assets	3,325	2,148
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Assets	1,846	2,148
Gross Amounts Not offset in the Statement of Income - Cash Collateral, Derivative Assets
Net Amounts Presented in the Statement of Income, Derivative Assets	1,479
Gross Amounts Recognized, Derivative Liabilities	23,811	24,015
Gross Amounts Offset in the Statement of Income, Derivative Liabilities	(21,651)	(20,077)
Net Amounts Presented in the Statement of Income, Derivative Liabilities	2,160	3,938
Gross Amounts Not Offset in the Statement of Income - Financial Instruments, Derivative Liabilities	1,846	2,148
Gross Amounts Not offset in the Statement of Income - Cash Collateral, Derivative Liabilities	2,871	4,099
Net Amounts Presented in the Statement of Income, Derivative Liabilities	$ (2,557)	$ (2,309)