Premises and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 205,625,000	$ 164,863,000
Less accumulated depreciation and amortization	(50,893,000)	(46,155,000)
Total	154,732,000	118,708,000
Depreciation and amortization expense	10,200,000	6,300,000	5,700,000
Change in estimate, impact to net income	886,000
Change in estimate, impact to earnings per share	0.02
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	48,992,000	39,441,000
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	94,878,000	84,407,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14,254,000	2,684,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	29,465,000	24,110,000
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	546,000	438,000
Computer Software, Intangible Asset [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 17,490,000	$ 13,783,000