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LOANS AND ALLOWANCE FOR LOAN LOSSES - Credit Quality Indicator (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]        
Number of days past due after which a retail loan is rated 90 days      
Loans $ 1,315,582,000 $ 1,203,482,000    
Deteriorated Loans Transferred in [Abstract]        
Contractually required principal and interest, beginning of period 1,940,000 2,912,000 $ 3,621,000  
Contractually required principal and interest, income accretion 0 0 0  
Contractually required principal and interest, all other adjustments (988,000) (972,000) (709,000)  
Contractually required principal and interest, end of period 952,000 1,940,000 2,912,000  
Contractual cash flows not expected to be collected (nonaccretable discount), beginning of period (352,000) (506,000) (570,000)  
Contractual cash flows not expected to be collected (nonaccretable discount), income accretion 0 0 0  
Contractual cash flows not expected to be collected (nonaccretable discount), all other adjustments 286,000 154,000 64,000  
Contractual cash flows not expected to be collected (nonaccretable discount), end of period (66,000) (352,000) (506,000)  
Cash flows expected to be collected 886,000 1,588,000 2,406,000 $ 3,051,000
Cash flows expected to be collected, income accretion 0 0 0  
Cash flows expected to be collected, all other adjustments (702,000) (818,000) (645,000)  
Interest component of expected cash flows (accretable yield), beginning of period (170,000) (311,000) (420,000)  
Interest component of expected cash flows (accretable yield), income accretion 61,000 112,000 174,000  
Interest component of expected cash flows (accretable yield), all other adjustments 15,000 29,000 (65,000)  
Interest component of expected cash flows (accretable yield, end of period (94,000) (170,000) (311,000)  
Recorded Investment in loans acquired with deteriorating credit quality 792,000 1,418,000 2,095,000 $ 2,631,000
Recorded Investment in loans acquired with deteriorating credit quality, income accretion 61,000 112,000 174,000  
Recorded Investment in loans acquired with deteriorating credit quality, all other adjustments (687,000) (789,000) (710,000)  
Increase in allowance for loan losses for loans acquired 55,000 15,000 5,000  
Writedowns on OREO 30,000 0 $ 0  
Not Rated        
Financing Receivable, Recorded Investment [Line Items]        
Loans 464,414,000 449,634,000    
Pass        
Financing Receivable, Recorded Investment [Line Items]        
Loans 807,976,000 715,012,000    
Special Mention        
Financing Receivable, Recorded Investment [Line Items]        
Loans 14,112,000 11,110,000    
Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Loans 25,489,000 24,848,000    
Doubtful        
Financing Receivable, Recorded Investment [Line Items]        
Loans 2,799,000 1,460,000    
Commercial, and Agricultural        
Financing Receivable, Recorded Investment [Line Items]        
Loans 199,576,000 177,027,000    
Commercial mortgages:        
Financing Receivable, Recorded Investment [Line Items]        
Loans 646,174,000 570,156,000    
Commercial mortgages: | Construction        
Financing Receivable, Recorded Investment [Line Items]        
Loans 45,688,000 46,510,000    
Commercial mortgages: | Commercial mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 600,486,000 523,646,000    
Commercial mortgages: | Not Rated | Construction        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Commercial mortgages: | Not Rated | Commercial mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Commercial mortgages: | Pass | Construction        
Financing Receivable, Recorded Investment [Line Items]        
Loans 45,553,000 45,055,000    
Commercial mortgages: | Pass | Commercial mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 575,321,000 496,723,000    
Commercial mortgages: | Special Mention | Construction        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 259,000    
Commercial mortgages: | Special Mention | Commercial mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 9,665,000 8,574,000    
Commercial mortgages: | Substandard | Construction        
Financing Receivable, Recorded Investment [Line Items]        
Loans 135,000 1,196,000    
Commercial mortgages: | Substandard | Commercial mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 13,331,000 15,566,000    
Commercial mortgages: | Doubtful | Construction        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Commercial mortgages: | Doubtful | Commercial mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 1,377,000 1,460,000    
Residential Mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 194,937,000 198,965,000    
Residential Mortgages | Not Rated        
Financing Receivable, Recorded Investment [Line Items]        
Loans 191,777,000 194,669,000    
Residential Mortgages | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Residential Mortgages | Special Mention        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Residential Mortgages | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Loans 3,160,000 4,201,000    
Residential Mortgages | Doubtful        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 274,895,000 257,334,000    
Consumer Loans | Credit cards        
Financing Receivable, Recorded Investment [Line Items]        
Loans 1,516,000 1,476,000    
Consumer Loans | Home equity lines and loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 100,878,000 98,853,000    
Consumer Loans | Indirect Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 153,532,000 139,993,000    
Consumer Loans | Direct consumer loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 18,969,000 17,012,000    
Consumer Loans | Not Rated | Credit cards        
Financing Receivable, Recorded Investment [Line Items]        
Loans 1,516,000 1,476,000    
Consumer Loans | Not Rated | Home equity lines and loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 99,568,000 97,183,000    
Consumer Loans | Not Rated | Indirect Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 152,598,000 139,339,000    
Consumer Loans | Not Rated | Direct consumer loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 18,955,000 16,967,000    
Consumer Loans | Pass | Credit cards        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Pass | Home equity lines and loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Pass | Indirect Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Pass | Direct consumer loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Special Mention | Credit cards        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Special Mention | Home equity lines and loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Special Mention | Indirect Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Special Mention | Direct consumer loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Substandard | Credit cards        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Substandard | Home equity lines and loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 1,310,000 1,670,000    
Consumer Loans | Substandard | Indirect Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 934,000 654,000    
Consumer Loans | Substandard | Direct consumer loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 14,000 45,000    
Consumer Loans | Doubtful | Credit cards        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Doubtful | Home equity lines and loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Doubtful | Indirect Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Consumer Loans | Doubtful | Direct consumer loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Loans acquired with deteriorated credit quality        
Financing Receivable, Recorded Investment [Line Items]        
Loans 792,000 1,418,000    
Loans acquired with deteriorated credit quality | Commercial, and Agricultural        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Loans acquired with deteriorated credit quality | Commercial mortgages:        
Financing Receivable, Recorded Investment [Line Items]        
Loans 792,000 1,323,000    
Loans acquired with deteriorated credit quality | Commercial mortgages: | Construction        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Loans acquired with deteriorated credit quality | Commercial mortgages: | Commercial mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 792,000 1,323,000    
Loans acquired with deteriorated credit quality | Residential Mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 95,000    
Loans acquired with deteriorated credit quality | Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Loans acquired with deteriorated credit quality | Consumer Loans | Credit cards        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Loans acquired with deteriorated credit quality | Consumer Loans | Home equity lines and loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Loans acquired with deteriorated credit quality | Consumer Loans | Indirect Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Loans acquired with deteriorated credit quality | Consumer Loans | Direct consumer loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Commercial and industrial | Commercial, and Agricultural        
Financing Receivable, Recorded Investment [Line Items]        
Loans 199,030,000 176,666,000    
Commercial and industrial | Commercial, and Agricultural | Not Rated        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Commercial and industrial | Commercial, and Agricultural | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Loans 186,556,000 172,873,000    
Commercial and industrial | Commercial, and Agricultural | Special Mention        
Financing Receivable, Recorded Investment [Line Items]        
Loans 4,447,000 2,277,000    
Commercial and industrial | Commercial, and Agricultural | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Loans 6,605,000 1,516,000    
Commercial and industrial | Commercial, and Agricultural | Doubtful        
Financing Receivable, Recorded Investment [Line Items]        
Loans 1,422,000 0    
Commercial and industrial | Loans acquired with deteriorated credit quality | Commercial, and Agricultural        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Agricultural | Commercial, and Agricultural        
Financing Receivable, Recorded Investment [Line Items]        
Loans 546,000 361,000    
Agricultural | Commercial, and Agricultural | Not Rated        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Agricultural | Commercial, and Agricultural | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Loans 546,000 361,000    
Agricultural | Commercial, and Agricultural | Special Mention        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Agricultural | Commercial, and Agricultural | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Agricultural | Commercial, and Agricultural | Doubtful        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Agricultural | Loans acquired with deteriorated credit quality | Commercial, and Agricultural        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Performing | Residential Mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 191,777,000 194,764,000    
Performing | Consumer Loans | Credit cards        
Financing Receivable, Recorded Investment [Line Items]        
Loans 1,516,000 1,476,000    
Performing | Consumer Loans | Home equity lines and loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 99,568,000 97,183,000    
Performing | Consumer Loans | Indirect Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 152,598,000 139,339,000    
Performing | Consumer Loans | Direct consumer loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 18,955,000 16,967,000    
Non-Performing | Residential Mortgages        
Financing Receivable, Recorded Investment [Line Items]        
Loans 3,160,000 4,201,000    
Non-Performing | Consumer Loans | Credit cards        
Financing Receivable, Recorded Investment [Line Items]        
Loans 0 0    
Non-Performing | Consumer Loans | Home equity lines and loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 1,310,000 1,670,000    
Non-Performing | Consumer Loans | Indirect Consumer Loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans 934,000 654,000    
Non-Performing | Consumer Loans | Direct consumer loans        
Financing Receivable, Recorded Investment [Line Items]        
Loans $ 14,000 $ 45,000