FAIR VALUE - RECURRING BASIS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2008
Financial assets:          
Securities available for sale $ 481,275,000 $ 517,058,000      
Mortgage loans held for sale, at fair value 11,662,000 4,083,000 $ 6,388,000 $ 3,506,000  
Consumer loans held for sale $ 2,198,000        
Financial Liabilities:          
Consumer loans held for sale period 21 days        
Mortgage Servicing Rights          
Financial assets:          
Mortgage loans held for sale, at fair value $ 0 0      
U.S. Treasury securities and U.S. Government agencies          
Financial assets:          
Securities available for sale 294,544,000 286,479,000      
Private label mortgage backed security          
Financial assets:          
Securities available for sale 4,777,000 5,132,000      
Mortgage backed securities - residential          
Financial assets:          
Securities available for sale 73,004,000 92,268,000      
Collateralized mortgage obligations          
Financial assets:          
Securities available for sale 87,654,000 113,668,000      
Freddie Mac preferred stock          
Financial assets:          
Securities available for sale 483,000 173,000     $ 0
Community Reinvestment Act mutual fund          
Financial assets:          
Securities available for sale 2,455,000 1,011,000      
Corporate bonds          
Financial assets:          
Securities available for sale 15,158,000 14,922,000      
Trust preferred security          
Financial assets:          
Securities available for sale 3,200,000 3,405,000      
Recurring basis          
Financial assets:          
Securities available for sale 481,275,000 517,058,000      
Mortgage loans held for sale, at fair value 11,662,000 4,083,000      
Consumer loans held for sale 2,198,000        
Rate lock loan commitments 299,000 306,000      
Mandatory forward contracts 204,000        
Interest rate swap agreements 305,000 400,000      
Financial Liabilities:          
Mandatory forward contracts   25,000      
Interest rate swap agreements 597,000 1,000,000      
Transfers between Level 1, 2 or 3 0 0      
Recurring basis | U.S. Treasury securities and U.S. Government agencies          
Financial assets:          
Securities available for sale 294,544,000 286,479,000      
Recurring basis | Private label mortgage backed security          
Financial assets:          
Securities available for sale 4,777,000 5,132,000      
Recurring basis | Mortgage backed securities - residential          
Financial assets:          
Securities available for sale 73,004,000 92,268,000      
Recurring basis | Collateralized mortgage obligations          
Financial assets:          
Securities available for sale 87,654,000 113,668,000      
Recurring basis | Freddie Mac preferred stock          
Financial assets:          
Securities available for sale 483,000 173,000      
Recurring basis | Community Reinvestment Act mutual fund          
Financial assets:          
Securities available for sale 2,455,000 1,011,000      
Recurring basis | Corporate bonds          
Financial assets:          
Securities available for sale 15,158,000 14,922,000      
Recurring basis | Trust preferred security          
Financial assets:          
Securities available for sale 3,200,000 3,405,000      
Recurring basis | Fair Value, Inputs, Level 1          
Financial assets:          
Securities available for sale 2,455,000 1,011,000      
Recurring basis | Fair Value, Inputs, Level 1 | Community Reinvestment Act mutual fund          
Financial assets:          
Securities available for sale 2,455,000 1,011,000      
Recurring basis | Fair Value, Inputs, Level 2          
Financial assets:          
Securities available for sale 470,843,000 507,510,000      
Mortgage loans held for sale, at fair value 11,662,000 4,083,000      
Rate lock loan commitments 299,000 306,000      
Mandatory forward contracts 204,000        
Interest rate swap agreements 305,000 400,000      
Financial Liabilities:          
Mandatory forward contracts   25,000      
Interest rate swap agreements 597,000 1,000,000      
Recurring basis | Fair Value, Inputs, Level 2 | U.S. Treasury securities and U.S. Government agencies          
Financial assets:          
Securities available for sale 294,544,000 286,479,000      
Recurring basis | Fair Value, Inputs, Level 2 | Mortgage backed securities - residential          
Financial assets:          
Securities available for sale 73,004,000 92,268,000      
Recurring basis | Fair Value, Inputs, Level 2 | Collateralized mortgage obligations          
Financial assets:          
Securities available for sale 87,654,000 113,668,000      
Recurring basis | Fair Value, Inputs, Level 2 | Freddie Mac preferred stock          
Financial assets:          
Securities available for sale 483,000 173,000      
Recurring basis | Fair Value, Inputs, Level 2 | Corporate bonds          
Financial assets:          
Securities available for sale 15,158,000 14,922,000      
Recurring basis | Fair Value, Inputs, Level 3          
Financial assets:          
Securities available for sale 7,977,000 8,537,000      
Consumer loans held for sale 2,198,000        
Recurring basis | Fair Value, Inputs, Level 3 | Private label mortgage backed security          
Financial assets:          
Securities available for sale 4,777,000 5,132,000      
Recurring basis | Fair Value, Inputs, Level 3 | Trust preferred security          
Financial assets:          
Securities available for sale $ 3,200,000 $ 3,405,000