Derivative Financial Instruments - Additional Information (Details 2) (Interest Rate Swap [Member], Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Customer
Customer interest rate swaps (commerical customer counterparty):
Notional amount of assets, Assets	$ 24,300	$ 24,485
Customer interest rate swaps (commerical customer counterparty):
Fair Value of assets, Assets	350	274
Correspondent
Correspondent interest rate swaps (financial institution counterparty):
Notional amount of liabilities, Liabilities	24,300	24,485
Correspondent interest rate swaps (financial institution counterparty):
Fair Value of liabilities, Liabilities	$ (362)	$ (287)