Acquisitions Acquisitions-Narrative (Details) (USD $)	12 Months Ended		12 Months Ended							0 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 First National Bank of Olathe [Member]	Nov. 01, 2011 First National Bank of Olathe [Member]	Oct. 31, 2011 First National Bank of Olathe [Member]	Aug. 12, 2011 First National Bank of Olathe [Member] value_appreciation_instrument	Jan. 21, 2011 Legacy [Member]	Jan. 20, 2011 Legacy [Member]	Jan. 07, 2011 Legacy [Member] value_appreciation_instrument	Oct. 21, 2011 Creve Coeur, Missouri Branch [Member] sqft	Dec. 31, 2013 Residential Mortgage [Member]	Dec. 31, 2013 Covered Assets [Member]	Dec. 31, 2013 Covered Assets [Member] First National Bank of Olathe [Member]	Dec. 31, 2013 Up to $112.6 million [Member] Covered Assets [Member] First National Bank of Olathe [Member]	Dec. 31, 2013 $112.6 million to $148.9 million [Member] Covered Assets [Member] First National Bank of Olathe [Member]	Dec. 31, 2013 In excess of $148.9 million [Member] Covered Assets [Member] First National Bank of Olathe [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits										$ 43,000,000
Duration of FDIC shared-loss agreement											10 years	5 years
Reimbursement period for FDIC shared-loss agreement	8 years
Value Appreciation Instrument, Number of Units Issued						1,000,000			372,500
Value Appreciation Instrument, Exercise Price						13.59			10.63
Value Appreciation Instrument, Settlement Price					15.8393			11.8444
Value Appreciation Instrument, Cash Payment for Settlement of Units				2,200,000			452,364
FDIC indemnification asset	34,319,000	61,475,000											388,200,000
FDIC Share-loss Agreements, Coverage Percent			80.00%											80.00%	0.00%	80.00%
FDIC Share-loss Agreements, Loss Range, Upper Range Limit														112,600,000	148,900,000
FDIC Share-loss Agreements, Loss Range, Lower Range Limit															112,600,000	148,900,000
Discretionary trust assets									55,600,000
Non-discretionary trust asset									13,600,000
Total deposits										(18,500,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Demand Deposits										2,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Money Market Funds										21,900,000
Deposit premium										323,000
Personal property purchased in the branch	$ 38,957,000	$ 42,939,000								$ 150,000
Square feet of the office sublease										6,556
Number of branches to be sold	2