Derivative Financial Instruments - Additional Information (Details 2) - Interest Rate Swap [Member] - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Customer
Customer interest rate swaps (commerical customer counterparty):
Notional amount of assets, Assets	$ 20,634	$ 24,485
Customer interest rate swaps (commerical customer counterparty):
Fair Value of assets, Assets	245	274
Correspondent
Correspondent interest rate swaps (financial institution counterparty):
Notional amount of liabilities, Liabilities	20,634	24,485
Correspondent interest rate swaps (financial institution counterparty):
Fair Value of liabilities, Liabilities	$ (256)	$ (287)