Trust Preferred Securities - Additional Information (Details) (USD $)	1 Months Ended		3 Months Ended
	Aug. 31, 2010	May 31, 2007	Mar. 31, 2015	Dec. 31, 2014
Trust Preferred Securities [Line Items]
Accrued interest payable			$ 591,000	$ 596,000
Maturity date of subordinate notes			Jun. 15, 2037
Weighted average price of shares issued from securities conversion (in dollars per share)	$ 4.41
Balance of the subordinated notes payable			16,238,000	16,238,000
Common Stock
Trust Preferred Securities [Line Items]
Shares issued from conversion of preferred securities	462,234
Trust I [Member]
Trust Preferred Securities [Line Items]
Preferred securities sold to outside investors		10,000,000
Floating interest rate period		three-month LIBOR
LIBOR basis points		1.48%
Effective interest rate			1.75%
Accrued interest payable			6,000	6,000
Amount of principal securities exchanged for common stock	2,125,000
Balance of the subordinated notes payable				8,119,000
Trust II [Member]
Trust Preferred Securities [Line Items]
Preferred securities sold to outside investors		10,000,000.0
Floating interest rate period		three-month LIBOR
LIBOR basis points		1.48%
Fixed interest rate of Trust II		6.64%
Effective interest rate			6.64%
Accrued interest payable			22,000	22,000
Amount of principal securities exchanged for common stock	2,125,000
Balance of the subordinated notes payable			$ 8,119,000	$ 8,119,000