Derivatives and Balance Sheet Offsetting Balance Sheet Offsetting (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Balance Sheet Offsetting [Line Items]
Repurchase agreements, amounts offset in balance sheet	$ 0	$ 0
repurchase agreements, net amount presented in statement of financial position	25,000,000	25,000,000
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(25,000,000)	(25,000,000)
securities sold under agreements to repurchase, amount not offset	0	0
Interest Rate Contracts [Member]
Balance Sheet Offsetting [Line Items]
Derivative Assets, Gross Amounts Offset in the Balance Sheets	0	0
Derivative Asset	9,044,000	14,921,000
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	9,044	14,921
Derivative Liability, Gross Amounts Offset in Balance Sheets	0	0
Derivative Liability	9,044,000	14,921,000
Derivative, Collateral, Right to Reclaim Securities	(9,044,000)	(14,921,000)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0	0
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contracts [Member]
Balance Sheet Offsetting [Line Items]
Derivative Asset, Fair Value, Gross Asset	9,044,000	14,921,000
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contracts [Member]
Balance Sheet Offsetting [Line Items]
Derivative Liability, Fair Value, Gross Liability	9,044,000	14,921,000
Available-for-sale Securities [Member]
Balance Sheet Offsetting [Line Items]
Assets Sold under Agreements to Repurchase, Carrying Amount	$ 25,000,000	$ 25,000,000