BUSINESS COMBINATIONS BUSINESS COMBINATIONS (Textual) (Details) (USD $)	12 Months Ended	3 Months Ended
	Dec. 31, 2014 location	Mar. 16, 2015	Jun. 20, 2014	Mar. 06, 2015
Six Oregon Branches [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Jun. 20, 2014
Business Combination, Number of Branches	6
Business Combination, Acquired Receivables			$ 87,923,000
Business Combination, Acquired Assets			221,206,000
Business Combination, Acquired Deposits			212,085,000
Acquisition bargain purchase gain			9,079,000
Discount on net asset acquired			7,000,000
Net fair value adjustments on acquired assets and assumed liabilities			300,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years
Business Acquisition [Member] | Siuslaw Financial Group, Inc [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Mar. 06, 2015
Business Combination, Aggregate Consideration, Total		63,900,000
Business Combination, Aggregate Consideration, Cash		5,800,000
Business Combination, Aggregate Consideration, Common Stock Issued		58,100,000
Business Combination, Acquired Receivables				252,000,000
Business Combination, Acquired Assets				370,000,000
Business Combination, Acquired Deposits				$ 318,000,000