GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes to carrying amount of goodwill [Roll Forward]
Goodwill, beginning of period	$ 9,271,000	$ 24,959,000	$ 9,271,000
Goodwill acquired during the year		17,958,000	15,688,000
Adjustment to goodwill		(136,000)	0	0
Goodwill, end of period		42,781,000	24,959,000	9,271,000
Number of businesses acquired	3
Finite-Lived Intangible Assets [Line Items]
Amortization expense		762,000	229,000	97,000
Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		11,674,000	9,012,000
Less accumulated amortization		(2,627,000)	(1,865,000)
Net carrying amount		9,047,000	7,147,000
Core deposit intangibles acquired		2,700,000	7,300,000
Amortization expense		762,000	230,000	97,000
Summary of estimated amortization expense [Abstract]
2013		1,106,000
2014		1,106,000
2015		1,106,000
2016		1,106,000
2017		1,106,000
Thereafter		$ 3,517,000