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LOANS - Credit quality segments of loans receivable and allowance for loan losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Collectively evaluated Loans    
Performing loans $ 783,206 $ 744,455
Potential problem loans 9,898 7,275
Impaired loans
Unallocated allowance
Totals 793,104 751,730
Collectively evaluated Allowance    
Performing loans 5,619 5,117
Potential problem loans 339 261
Impaired loans
Unallocated allowance 563 337
Totals 6,521 5,715
Individually evaluated Loans    
Performing loans
Potential problem loans
Impaired loans 14,086 16,334
Unallocated allowance
Totals 14,086 16,334
Individually evaluated Allowance    
Performing loans
Potential problem loans
Impaired loans 255 412
Unallocated allowance
Totals 255 412
Total portfolio Loans    
Performing loans 783,206 744,455
Potential problem loans 9,898 7,275
Impaired loans 14,086 16,334
Unallocated allowance
Totals 807,190 768,064
Total portfolio Allowance    
Performing loans 5,619 5,117
Potential problem loans 339 261
Impaired loans 255 412
Unallocated allowance 563 337
Totals $ 6,776 $ 6,127