Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accumulated amortization of intangible assets
Gross Carrying Amount	$ 17,479	$ 17,479
Accumulated Amortization	(11,106)	(9,240)
Net Carrying Amount	6,373	8,239
Core deposit intangibles [Member]
Accumulated amortization of intangible assets
Gross Carrying Amount	16,759	16,759
Accumulated Amortization	(10,546)	(8,829)
Net Carrying Amount	6,213	7,930
Non-compete covenant [Member]
Accumulated amortization of intangible assets
Gross Carrying Amount	102	102
Accumulated Amortization	(76)	(51)
Net Carrying Amount	26	51
Lease intangible [Member]
Accumulated amortization of intangible assets
Gross Carrying Amount	618	618
Accumulated Amortization	(484)	(360)
Net Carrying Amount	$ 134	$ 258