Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 17,479	$ 17,479	$ 17,479
Finite-Lived Intangible Assets, Accumulated Amortization	(10,662)	(9,240)	(8,697)
Finite-Lived Intangible Assets, Net	6,817	8,239	8,782
Core Deposits [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	16,759	16,759	16,760
Finite-Lived Intangible Assets, Accumulated Amortization	(10,117)	(8,829)	(8,339)
Finite-Lived Intangible Assets, Net	6,642	7,930	8,421
Noncompete Agreements [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	102	102	102
Finite-Lived Intangible Assets, Accumulated Amortization	(70)	(51)	(45)
Finite-Lived Intangible Assets, Net	32	51	57
Lease Agreements [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	618	618	617
Finite-Lived Intangible Assets, Accumulated Amortization	(475)	(360)	(313)
Finite-Lived Intangible Assets, Net	$ 143	$ 258	$ 304