Derivative Financial Instruments Counterparty Credit Risk Narrative (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Cash Collateral Posted	$ (23,505,000)	$ (8,115,000)
Current Derivative Credit Exposure [Member] | Interest Rate Swaps With Bank Customers [Member]
Derivative [Line Items]
Maximum exposure	35,200,000
Future Derivative Credit Exposure [Member] | Interest Rate Swaps With Bank Customers [Member]
Derivative [Line Items]
Maximum exposure	14,200,000
Dealer D [Member]
Derivative [Line Items]
Cash Collateral Posted	(29,000,000)
Cash collateral	$ (5,500,000)