Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 24,564	$ 28,192
Finite-Lived Intangible Assets-Future Amortization Expense [Abstract]
2013	2,722
2014	2,683
2015	2,537
2016	2,080
2017	1,595
Thereafter	12,947
Goodwill [Roll Forward]
Goodwill, Gross	359,987	362,207	335,829
Goodwill, Accumulated Impairment	(228)	(228)	(228)
Goodwill	359,759	361,979	335,601
Goodwill, Acquired During Period		26,378
Goodwill, Purchase Accounting Adjustments	(2,220)
Commercial [Member]
Goodwill [Roll Forward]
Goodwill, Gross	268,942	271,162	266,728
Goodwill, Accumulated Impairment	0	0	0
Goodwill	268,942	271,162	266,728
Goodwill, Acquired During Period		4,434
Goodwill, Purchase Accounting Adjustments	(2,220)
Consumer [Member]
Goodwill [Roll Forward]
Goodwill, Gross	39,251	39,251	39,251
Goodwill, Accumulated Impairment	(228)	(228)	(228)
Goodwill	39,023	39,023	39,023
Goodwill, Acquired During Period		0
Goodwill, Purchase Accounting Adjustments	0
Wealth Management [Member]
Goodwill [Roll Forward]
Goodwill, Gross	51,794	51,794	29,850
Goodwill, Accumulated Impairment	0	0	0
Goodwill	51,794	51,794	29,850
Goodwill, Acquired During Period		21,944
Goodwill, Purchase Accounting Adjustments	0
Arizona [Member]
Goodwill [Roll Forward]
Goodwill	16,422	16,422
Colorado [Member]
Goodwill [Roll Forward]
Goodwill	77,555	77,555
New Mexico
Goodwill [Roll Forward]
Goodwill	15,273	15,273
Oklahoma [Member]
Goodwill [Roll Forward]
Goodwill	10,387	12,607
Texas [Member]
Goodwill [Roll Forward]
Goodwill	240,122	240,122
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	33,749	33,749
Accumulated amortization	32,656	32,180
Finite-lived intangible assets, net	1,093	1,569
Finite-Lived Intangible Assets-Future Amortization Expense [Abstract]
2013	432
2014	393
2015	247
2016	21
2017	0
Thereafter	0
Core Deposits [Member] | Arizona [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	0	0
Core Deposits [Member] | Colorado [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	277	377
Core Deposits [Member] | Texas [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	816	1,192
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	37,992	38,191
Accumulated amortization	14,521	11,568
Finite-lived intangible assets, net	23,471	26,623
Finite-Lived Intangible Assets-Future Amortization Expense [Abstract]
2013	2,290
2014	2,290
2015	2,290
2016	2,059
2017	1,595
Thereafter	12,947
Other Intangible Assets [Member] | Colorado [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	13,482	15,976
Other Intangible Assets [Member] | Kansas/Missouri [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	790	790
Other Intangible Assets [Member] | Oklahoma [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 9,199	$ 9,857