Derivatives and Hedging Activities Derivatives and Hedge Activities (Master Netting Agreements) (Details) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014
Derivative [Line Items]
Gross fair value, Derivative assets		$ 28,274		$ 24,699
Netting adjustments, Derivative assets		8,971	[1]	(5,858)	[2]
Derivative Assets		37,245		18,841
Cash collateral paid, Derivative assets	[3]			0
Securities pledged, Derivative assets		0		0
Net amount - Derivative assets		37,245		18,841
Gross fair value, Derivative Liabilities		(5,511)		(6,636)
Netting adjustments, Derivative Liabilities		(5,411)	[1]	(5,858)	[2]
Derivative Liabilities		(100)		(778)
Cash collateral paid, Derivative Liabilities	[3]			0
Securities pledged, Derivative liabilities		5		762
Net amount, Derivative liabilities		(95)		(16)
Fair Value, Concentration of Credit Risk, Master Netting Arrangements [Member]
Derivative [Line Items]
Cash collateral		$ 14,400		$ 20,400

[1] Includes cash collateral of $14.4 million at December 31, 2015, as part of netting adjustments which primarily consists of collateral transferred by the Company at the initiation of derivative transactions and held by the counterparty as security.

[2] Excludes cash collateral of $20.4 million at December 31, 2014 as part of netting adjustments which primarily consists of collateral transferred by the Company at the initiation of derivative transactions and held by the counterparty as security.

[3] Excludes cash collateral of $20.4 million at December 31, 2014, as part of the netting adjustments which primarily consists of collateral transferred by the Company at the initiation of derivative transactions and held by the counterparty as security. These amounts were not netted against the derivative receivables and payables, because, at an individual counterparty level, the collateral exceeded the fair value exposure at December 31, 2014.