Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 17,479	$ 17,479	$ 17,479
Finite-Lived Intangible Assets, Accumulated Amortization	(10,205)	(9,240)	(8,154)
Finite-Lived Intangible Assets, Net	7,274	8,239	9,325
Core Deposits [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	16,759	16,759	16,760
Finite-Lived Intangible Assets, Accumulated Amortization	(9,689)	(8,829)	(7,850)
Finite-Lived Intangible Assets, Net	7,070	7,930	8,910
Noncompete Agreements [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	102	102	102
Finite-Lived Intangible Assets, Accumulated Amortization	(63)	(51)	(38)
Finite-Lived Intangible Assets, Net	39	51	64
Lease Agreements [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	618	618	617
Finite-Lived Intangible Assets, Accumulated Amortization	(453)	(360)	(266)
Finite-Lived Intangible Assets, Net	$ 165	$ 258	$ 351