INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 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	(506)	(554)
Balance, end of period	3,724	5,777
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	(506)	(552)
Balance, end of period	3,724	5,770
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	0	9
Amortization	0	(2)
Balance, end of period	$ 0	$ 7