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LOANS AND ALLOWANCE FOR CREDIT LOSSES (Impaired Financing Receivables by Loan Class) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance $ 19,266 $ 26,160
Recorded investment with no allowance 10,977 10,896
Recorded investment with an allowance 7,320 11,076
Related allowance 805 2,141
Average recorded investment 19,913 25,490
Interest income recognized 447 465
Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 5,940 13,160
Recorded investment with no allowance 1,813 3,015
Recorded investment with an allowance 3,158 5,957
Related allowance 492 1,904
Average recorded investment 7,155 11,565
Impaired Accruing Restructured Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 13,326 13,000
Recorded investment with no allowance 9,164 7,881
Recorded investment with an allowance 4,162 5,119
Related allowance 313 237
Average recorded investment 12,758 13,925
Interest income recognized 447 465
Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 6,156 7,888
Recorded investment with no allowance 3,524 4,786
Recorded investment with an allowance 2,494 2,992
Related allowance 239 317
Average recorded investment 7,022 8,163
Interest income recognized 161 195
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 1,620 4,013
Recorded investment with no allowance 1,482 1,957
Recorded investment with an allowance   1,946
Related allowance   166
Average recorded investment 3,191 3,500
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 4,536 3,875
Recorded investment with no allowance 2,042 2,829
Recorded investment with an allowance 2,494 1,046
Related allowance 239 151
Average recorded investment 3,831 4,663
Interest income recognized 161 195
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 5,613 6,737
Recorded investment with no allowance 4,233 2,532
Recorded investment with an allowance 734 3,556
Related allowance 33 185
Average recorded investment 5,402 7,234
Interest income recognized 185 174
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 795 1,801
Recorded investment with no allowance 149 959
Recorded investment with an allowance   193
Related allowance   117
Average recorded investment 542 2,144
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 4,818 4,936
Recorded investment with no allowance 4,084 1,573
Recorded investment with an allowance 734 3,363
Related allowance 33 68
Average recorded investment 4,860 5,090
Interest income recognized 185 174
Commercial Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 425  
Recorded investment with an allowance 337  
Related allowance 33  
Average recorded investment 200 108
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 425  
Recorded investment with an allowance 337  
Related allowance 33  
Average recorded investment 200 108
Consumer Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance   99
Recorded investment with no allowance   99
Average recorded investment 41 106
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance   99
Recorded investment with no allowance   99
Average recorded investment 41 106
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 7,072 11,436
Recorded investment with no allowance 3,220 3,479
Recorded investment with an allowance 3,755 4,528
Related allowance 500 1,639
Average recorded investment 7,248 9,879
Interest income recognized 101 96
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 3,100 7,247
Recorded investment with no allowance 182  
Recorded investment with an allowance 2,821 3,818
Related allowance 459 1,621
Average recorded investment 3,181 5,707
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 3,972 4,189
Recorded investment with no allowance 3,038 3,479
Recorded investment with an allowance 934 710
Related allowance 41 18
Average recorded investment 4,067 4,172
Interest income recognized $ 101 $ 96