Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 17,479	$ 17,479	$ 17,479
Finite-Lived Intangible Assets, Accumulated Amortization	(9,723)	(9,240)	(7,611)
Finite-Lived Intangible Assets, Net	7,756	8,239	9,868
Core Deposits [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	16,759	16,759	16,760
Finite-Lived Intangible Assets, Accumulated Amortization	(9,246)	(8,829)	(7,360)
Finite-Lived Intangible Assets, Net	7,513	7,930	9,400
Noncompete Agreements [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	102	102	102
Finite-Lived Intangible Assets, Accumulated Amortization	(70)	(51)	(32)
Finite-Lived Intangible Assets, Net	32	51	70
Lease Agreements [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	618	618	617
Finite-Lived Intangible Assets, Accumulated Amortization	(407)	(360)	(219)
Finite-Lived Intangible Assets, Net	$ 211	$ 258	$ 398