Derivative Financial Instruments - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Details) - Interest rate contracts - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 81	$ 137
Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2,403	2,650
Not Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	3,559	3,730
Not Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 3,661	$ 3,887