Other Comprehensive Income (Loss) (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (54,751)	$ (55,659)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(12,177)	(12,217)	$ (12,336)	$ (12,504)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member] | Valuation Allowance of Deferred Tax Assets [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(12,100)
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(43,444)	$ (44,324)	$ 10,747	$ (18,222)
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member] | Valuation Allowance of Deferred Tax Assets [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (13,300)