FAIR VALUE OF FINANCIAL INSTRUMENTS- Carrying values and fair value (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Assets      
Fair value $ 246,339,000 $ 236,627,000  
Investment securities held to maturity 81,952,000 92,816,000  
Accrued interest receivable 8,202,000 7,697,000  
Liabilities      
Trust preferred debentures 37,405,000 37,057,000  
Accrued interest payable 1,045,000 979,000  
Fair value, additional information      
Other than temporary impairment, net of applicable loss-share reimbursements 824,000 461,000 $ 190,000
Level 1      
Assets      
Cash and due from banks 189,543,000 211,976,000  
Federal funds sold 1,173,000 499,000  
Fair value 75,901,000 48,302,000  
Level 2      
Assets      
Fair value 162,957,000 188,325,000  
Investment securities held to maturity 81,952,000 92,816,000  
Nonmarketable equity securities 19,485,000 15,472,000  
Loans held for sale 70,565,000 54,413,000  
Accrued interest receivable 8,202,000 7,697,000  
Derivative Assets 6,253,000 6,029,000  
Liabilities      
Deposits 2,404,231,000 2,371,397,000  
Short-term borrowings 131,557,000 107,538,000  
FHLB and other borrowings 236,736,000 40,054,000  
Subordinated debt 49,692,000 58,198,000  
Trust preferred debentures 33,054,000 33,537,000  
Accrued interest payable 1,045,000 979,000  
Level 3      
Assets      
Fair value 7,481,000    
Loans, net 2,305,206,000 1,992,745,000  
Carrying value      
Assets      
Cash and due from banks 189,543,000 211,976,000  
Federal funds sold 1,173,000 499,000  
Fair value 246,339,000 236,627,000  
Investment securities held to maturity 78,672,000 87,521,000  
Nonmarketable equity securities 19,485,000 15,472,000  
Loans, net 2,305,114,000 1,979,601,000  
Loans held for sale 70,565,000 54,413,000  
Accrued interest receivable 8,202,000 7,697,000  
Derivative Assets 6,253,000 6,029,000  
Liabilities      
Deposits 2,404,366,000 2,367,648,000  
Short-term borrowings 131,557,000 107,538,000  
FHLB and other borrowings 237,518,000 40,178,000  
Subordinated debt 54,508,000 61,859,000  
Trust preferred debentures 37,405,000 37,057,000  
Accrued interest payable 1,045,000 979,000  
Fair value      
Assets      
Cash and due from banks 189,543,000 211,976,000  
Federal funds sold 1,173,000 499,000  
Fair value 246,339,000 236,627,000  
Investment securities held to maturity 81,952,000 92,816,000  
Nonmarketable equity securities 19,485,000 15,472,000  
Loans, net 2,305,206,000 1,992,745,000  
Loans held for sale 70,565,000 54,413,000  
Accrued interest receivable 8,202,000 7,697,000  
Derivative Assets 6,253,000 6,029,000  
Liabilities      
Deposits 2,404,231,000 2,371,397,000  
Short-term borrowings 131,557,000 107,538,000  
FHLB and other borrowings 236,736,000 40,054,000  
Subordinated debt 49,692,000 58,198,000  
Trust preferred debentures 33,054,000 33,537,000  
Accrued interest payable 1,045,000 979,000  
Forward commitments to sell mortgage-backed securities | Level 2      
Assets      
Derivative Assets 125,000    
Liabilities      
Derivative Liability   126,000  
Forward commitments to sell mortgage-backed securities | Carrying value      
Assets      
Derivative Assets 125,000    
Liabilities      
Derivative Liability   126,000  
Forward commitments to sell mortgage-backed securities | Fair value      
Assets      
Derivative Assets 125,000    
Liabilities      
Derivative Liability   126,000  
Interest rate swap agreements | Level 2      
Liabilities      
Derivative Liability   2,000  
Interest rate swap agreements | Carrying value      
Liabilities      
Derivative Liability   2,000  
Interest rate swap agreements | Fair value      
Liabilities      
Derivative Liability   2,000  
Corporate securities      
Assets      
Fair value 47,405,000 19,869,000  
Fair value, additional information      
AFS transferred to Level 3 6,749,000    
Transferred to Level 2 $ 2,000,000    
Corporate securities | Minimum      
Fair value, additional information      
Discount rate (negative) (2.5)    
Corporate securities | Maximum      
Fair value, additional information      
Discount rate 2.50%    
Corporate securities | Weighted average      
Fair value, additional information      
Discount rate 1.50%    
Non-agency mortgage-backed securities      
Fair value, additional information      
AFS transferred to Level 3 $ 2,000    
Other than temporary impairment, net of applicable loss-share reimbursements $ 824,000 461,000  
Non-agency mortgage-backed securities | Minimum      
Fair value, additional information      
Discount rate (negative) (5.0)    
Non-agency mortgage-backed securities | Maximum      
Fair value, additional information      
Discount rate 5.00%    
Covered non-agency mortgage-backed securities      
Fair value, additional information      
Transferred to Level 2   $ 55,910,000