PREMISES AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 91,650	$ 69,671
Less accumulated depreciation and amortization	(28,189)	(25,073)
Premises and equipment, net	63,461	44,598
Depreciation expense	3,799	3,265	3,300
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	14,949	9,521
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	40,505	29,296
Furniture, fixtures, and equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	23,775	19,647
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	812	495
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	10,047	10,006
Construction-in-process [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 1,562	$ 706