INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2007 acquisition
Finite-Lived Intangible Assets [Line Items]
Number of Bank Acquisitions, Created Finite-Lived Intangible Asset			3
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	$ 4,230	$ 6,331
Amortization	(983)	(2,101)
Balance, end of period	3,247	4,230
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	4,230	6,322
Amortization	(983)	(2,092)
Balance, end of period	3,247	4,230
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	0	9
Amortization	0	(9)
Balance, end of period	$ 0	$ 0