OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2007 acquisition
Finite-Lived Intangible Assets [Line Items]
Number of bank acquisitions				3
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	$ 6,331	$ 8,609	$ 11,070
Amortization	(2,101)	(2,278)	(2,461)
Balance, end of period	4,230	6,331	8,609
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	8 years
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	6,322	8,598	11,057
Amortization	(2,092)	(2,276)	(2,459)
Balance, end of period	4,230	6,322	8,598
Other [Member]
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of period	9	11	13
Amortization	(9)	(2)	(2)
Balance, end of period	$ 0	$ 9	$ 11