Derivatives (Offsetting Derivative Assets and Liabilities Subject to Master Netting Arrangements) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivatives [Abstract]
Gross Amounts Recognized, Derivative Assets	$ 1,352	$ 224
Gross Amounts Offset in the Statement of Financial Position, Derivative Assets
Net Amounts Presented in the Statement of Financial Position, Derivative Assets	1,352	224
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Assets	1,352	224
Gross Amounts Not offset in the Statement of Financial Position -Cash Collateral, Derivative Assets
Net Amount, Derivative Asset
Gross Amounts Recognized, Derivative Liabilities	36,267	21,034
Gross Amounts Offset in the Statement of Financial Position, Derivative Liabilities
Net Amounts Presented in the Statement of Financial Position, Derivative Liabilities	36,267	21,034
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments, Derivative Liabilities	1,352	224
Gross Amounts Not offset in the Statement of Financial Position -Cash Collateral, Derivative Liabilities	37,451	23,482
Net Amount, Derivative Liabilities	$ (2,536)	$ (2,672)