Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Purchase of Legacy Bank [Member]	Dec. 31, 2011 Purchase of The First National Bank of Olathe [Member]
Goodwill [Roll Forward]
Goodwill	$ 30,334	$ 30,334	$ 2,064
Goodwill, Acquired During Period				1,558	26,712
Goodwill	$ 30,334	$ 30,334	$ 2,064