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MERGER AND ACQUISITION ACTIVITY (Details)
3 Months Ended 9 Months Ended
Oct. 16, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
shares
Business Acquisition [Line Items]            
Assets   $ 2,871,798,000   $ 2,871,798,000   $ 2,789,853,000
Loans and Leases Receivable, Net Amount   1,809,011,000   1,809,011,000   1,751,494,000
Deposits   $ 2,008,177,000   $ 2,008,177,000   $ 1,932,097,000
Common stock, outstanding (shares) | shares   7,454,045   7,454,045   7,426,222
Merger and acquisition costs   $ 766,000 $ 0 $ 1,629,000 $ 0  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs       (537,000)    
SBM Financial, Inc.            
Business Acquisition [Line Items]            
Merger and acquisition costs   $ 766,000   $ 1,600,000    
Effective income tax rate increase (percent)   0.00%   2.10%    
Common Stock            
Business Acquisition [Line Items]            
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs       $ (537,000)    
Common Stock | SBM Financial, Inc.            
Business Acquisition [Line Items]            
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs       $ 537,000    
Subsequent Event | SBM Financial, Inc.            
Business Acquisition [Line Items]            
Business acquisition, cash consideration, per share amount (dollars per share) | $ / shares $ 206.00          
Business acquisition, stock for stock consideration, conversion ratio 5.421          
Business Acquisition, Percentage of Voting Interests Acquired 80.00%          
Common stock, outstanding (shares) | shares 10,203,807          
Consideration transferred $ 136,700,000          
Payments to Acquire Businesses, Gross $ 26,100,000          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 2,749,762          
Share Price | $ / shares $ 39.48          
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 108,600,000          
Share-based compensation, options, nonvested (shares) | shares 92,688          
Subsequent Event | Nonqualified Stock Options [Member] | SBM Financial, Inc.            
Business Acquisition [Line Items]            
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 2,000,000          
Subsequent Event | Pro Forma [Member] | SBM Financial, Inc.            
Business Acquisition [Line Items]            
Assets 815,000,000          
Loans and Leases Receivable, Net Amount 640,000,000          
Deposits $ 710,000,000