Goodwill and Intangible Assets (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Accumulated amortization of intangible assets
Gross Carrying Amount	$ 17,479	$ 17,479	$ 17,479
Accumulated Amortization	(8,154)	(7,068)	(5,057)
Net Carrying Amount	9,325	10,411	12,422
Core deposit intangibles [Member]
Accumulated amortization of intangible assets
Gross Carrying Amount	16,760	16,760	16,760
Accumulated Amortization	(7,850)	(6,871)	(4,966)
Net Carrying Amount	8,910	9,889	11,794
Non-compete covenant [Member]
Accumulated amortization of intangible assets
Gross Carrying Amount	102	102	102
Accumulated Amortization	(38)	(25)	(13)
Net Carrying Amount	64	77	89
Lease intangible [Member]
Accumulated amortization of intangible assets
Gross Carrying Amount	617	617	617
Accumulated Amortization	(266)	(172)	(78)
Net Carrying Amount	$ 351	$ 445	$ 539