Derivatives and Hedging Activities Interest Rate Swap Gains or Losses (Details) - Interest Rate Swap - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest Expense
Pre-Tax Gains or Losses
Amount of loss reclassified from OCI to interest expense	$ (1,578)	$ (1,257)	$ (3,407)	$ (2,508)
Other Non-Interest Expense
Pre-Tax Gains or Losses
Amount of loss recognized in other non-interest expense (ineffective portion)	0	0	0	0
Other Comprehensive Income
Pre-Tax Gains or Losses
Amount of (loss) gain recognized in OCI (effective portion)	$ (4,020)	$ 3,896	$ (13,948)	$ (2,097)