BRANCH DIVESTITURES AND RESTRUCTURING CHARGES (Textual) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 25, 2015 USD ($) offices	Sep. 11, 2015 USD ($) offices
Branch Divestitures and Restructuring Charges [Line Items]
Net gain (loss) on sale of retail branch offices	$ 3,331,000	$ 0	$ 3,331,000	$ 0
Restructuring charges on retail branch offices and other facilities	961,000	$ 0	18,540,000	$ 0
Retail branch offices [Member]
Branch Divestitures and Restructuring Charges [Line Items]
Restructuring charges on retail branch offices and other facilities	154,000		4,700,000
Former retail branch offices and other facilities [Member]
Branch Divestitures and Restructuring Charges [Line Items]
Restructuring charges on retail branch offices and other facilities	807,000		$ 13,000,000
Napa, Brentwood, Fairfield California Branches [Member]
Branch Divestitures and Restructuring Charges [Line Items]
Number of Branch Offices Sold | offices					3
Loans purchased pursuant to sales agreement					$ 11,700,000
Premises and equipment purchased pursuant to sales agreement					3,200,000
Net gain (loss) on sale of retail branch offices	3,400,000
Napa, Brentwood, Fairfield California Branches [Member] | Deposits [Member]
Branch Divestitures and Restructuring Charges [Line Items]
Deposits assumed pursuant to sales agreement					$ 73,600,000
Bradenton, Palmetto, Longboat Key Florida Branches [Member]
Branch Divestitures and Restructuring Charges [Line Items]
Number of Branch Offices Sold | offices						8
Loans purchased pursuant to sales agreement						$ 30,300,000
Premises and equipment purchased pursuant to sales agreement						4,900,000
Net gain (loss) on sale of retail branch offices	$ (62,000)
Bradenton, Palmetto, Longboat Key Florida Branches [Member] | Deposits [Member]
Branch Divestitures and Restructuring Charges [Line Items]
Deposits assumed pursuant to sales agreement						$ 150,800,000