Goodwill and Core Deposit and Trust Relationship Intangibles (Additional Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 26, 2012 Branch Acquisition [Member]	Dec. 31, 2013 Banking [Member]	Dec. 31, 2012 Banking [Member]	Dec. 31, 2011 Banking [Member]	Dec. 31, 2013 Financial Services [Member]	Dec. 31, 2012 Financial Services [Member]	Dec. 31, 2011 Financial Services [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill acquired in business acquisition	$ 44,806	$ 47,636	$ 41,730	$ 6,182	$ 40,902	$ 40,902	$ 34,720	$ 3,904	$ 6,734	$ 7,010
Core deposit intangible				2,856
Goodwill, Impaired, Accumulated Impairment Loss	3,570	740	740		0	0	0	3,570	740	740
Goodwill, Period Increase (Decrease)	2,830	(5,906)			0	(6,182)		2,830	276
Goodwill, Written off Related to Sale of Business Unit									$ 276