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BUSINESS COMBINATIONS AND BRANCH SALES - Private Bank of California Acquisition (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jul. 01, 2013
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Business Acquisition [Line Items]          
Goodwill   $ 30,143 $ 39,244 $ 31,591 $ 7,048
Series A Preferred Stock          
Business Acquisition [Line Items]          
Preferred stock, shares outstanding     32,000 32,000  
Preferred stock, liquidation preference per share (in dollars per share) $ 1,000   $ 1,000 $ 1,000  
Preferred stock, shares issued 32,000   32,000 32,000  
Core deposit intangibles | Minimum          
Business Acquisition [Line Items]          
Amortization period of other intangible assets     4 years    
Core deposit intangibles | Maximum          
Business Acquisition [Line Items]          
Amortization period of other intangible assets     10 years    
Private Bank of California          
Business Acquisition [Line Items]          
Shares paid as merger consideration 2,082,654        
Value of shares paid as merger consideration $ 28,300        
Per share closing price of common stock $ 13.58        
Cash paid as merger consideration $ 25,400        
Option payout 2,700        
Replacement awards 30        
Direct acquisition costs   $ 2,600      
Goodwill 15,126        
Other intangible assets $ 10,400        
Private Bank of California | Core deposit intangibles | Minimum          
Business Acquisition [Line Items]          
Amortization period of other intangible assets 2 years        
Private Bank of California | Core deposit intangibles | Maximum          
Business Acquisition [Line Items]          
Amortization period of other intangible assets 7 years        
Private Bank of California | Common Stock          
Business Acquisition [Line Items]          
Cash received per share $ 6.52        
Shares received conversion ratio 0.5379        
Private Bank of California | Preferred Stock          
Business Acquisition [Line Items]          
Shares received conversion ratio 1        
Private Bank of California          
Business Acquisition [Line Items]          
Preferred stock, shares outstanding 10,000        
Preferred stock, liquidation preference per share (in dollars per share) $ 1,000