Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,488,000		$ 4,488,000
Total goodwill and intangible assets	4,690,000		4,737,000
Estimated value of core deposits intangible assets		226,000
Legacy Merger [Member]
Business Acquisition [Line Items]
Date of acquisition agreement	Feb. 28, 2007
Purchase price allocation, goodwill amount	2,900,000
Taft Branch [Member]
Business Acquisition [Line Items]
Date of acquisition agreement	Apr. 30, 2004
Core Deposits Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Core deposit intangible assets	202,000		249,000
Impairment losses	0	36,000
Total amount of core deposit intangible asset at the time of merger	3,000,000
Estimated life of amortization	7 years
Pre-adjustment carrying value of core deposit intangible assets		262,000
Impairment loss on core deposit intangible, net of tax			21,000
Core Deposits Intangible Assets [Member] | Legacy Merger [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense	0	12,000
Core Deposits Intangible Assets [Member] | Taft Branch [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Core deposit intangible assets	$ 202,000