BUSINESS COMBINATIONS BUSINESS COMBINATIONS (Schedule of Components of Acquisition) (Details) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Mar. 06, 2015	Mar. 31, 2015	Dec. 31, 2013	Jun. 20, 2014
Fair value of liabilities assumed:
Goodwill	$ 0	$ 21,148,000	$ 21,148,000	$ 0
Acquisition bargain purchase gain	9,079,000
Siuslaw Financial Group, Inc [Member]
Business Acquisition [Line Items]
Acquisition Date		Mar. 06, 2015
Consideration Transferred
Cash paid		5,806,000
Fair value of common shares issued		58,100,000
Total consideration		63,906,000
Fair value of assets acquired:
Cash and cash equivalents		84,405,000
Securities—available-for-sale		12,865,000
Loans receivable		247,098,000
Real estate owned, held for sale		2,525,000
Property and equipment		8,127,000
Core deposit intangible		3,895,000
Other assets		11,391,000
Total assets acquired		370,306,000
Fair value of liabilities assumed:
Deposits		316,406,000
Junior subordinated debentures		5,959,000
Other liabilities		5,183,000
Total liabilities assumed		327,548,000
Net assets acquired		42,758,000
Business Combination, Acquired Receivables, Gross Contractual Amount		252,200,000
Six Oregon Branches [Member]
Business Acquisition [Line Items]
Acquisition Date	Jun. 20, 2014
Consideration Transferred
Total consideration	0
Fair value of assets acquired:
Cash and cash equivalents					127,557,000
Loans receivable					87,923,000
Property and equipment					3,079,000
Core deposit intangible					2,372,000
Other assets					275,000
Total assets acquired					221,206,000
Fair value of liabilities assumed:
Deposits					212,085,000
Other liabilities					42,000
Total liabilities assumed					212,127,000
Net assets acquired					9,079,000
Business Combination, Acquired Receivables, Gross Contractual Amount					$ 88,300,000