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LOANS - Credit quality segments of loans receivable and allowance for loan losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Business Activities Loans - Collectively evaluated Loans    
Performing loans $ 649,738 $ 636,645
Potential problem loans 4,346 4,816
Impaired loans
Unallocated allowance
Totals 654,084 641,461
Business Activities Loans - Collectively evaluated Allowance    
Performing loans 5,088 5,062
Potential problem loans 174 196
Impaired loans
Unallocated allowance 530 337
Totals 5,792 5,595
Business Activities Loans - Individually evaluated Loans    
Performing loans
Potential problem loans
Impaired loans 12,132 12,688
Unallocated allowance
Totals 12,132 12,688
Business Activities Loans - Individually evaluated Allowance    
Performing loans
Potential problem loans
Impaired loans 174 221
Unallocated allowance
Totals 174 221
Business Activities Loans - Total portfolio Loans    
Performing loans 649,738 636,645
Potential problem loans 4,346 4,816
Impaired loans 12,132 12,688
Unallocated allowance
Totals 666,216 654,149
Business Activities Loans - Total portfolio Allowance    
Performing loans 5,088 5,062
Potential problem loans 174 196
Impaired loans 174 221
Unallocated allowance 530 337
Totals 5,966 5,816
Acquired Loans - Collectively evaluated Loans    
Performing loans 98,588 107,810
Potential problem loans 2,453 2,459
Impaired loans
Unallocated allowance
Totals 101,041 110,269
Acquired Loans - Collectively evaluated Allowance    
Performing loans 51 55
Potential problem loans 75 65
Impaired loans
Unallocated allowance
Totals 126 120
Acquired Loans - Individually evaluated Loans    
Performing loans
Potential problem loans
Impaired loans 2,598 3,646
Unallocated allowance
Totals 2,598 3,646
Acquired Loans - Individually evaluated Allowance    
Performing loans
Potential problem loans
Impaired loans 193 191
Unallocated allowance
Totals 193 191
Acquired Loans - Total portfolio Loans    
Performing loans 98,588 107,810
Potential problem loans 2,453 2,459
Impaired loans 2,598 3,646
Unallocated allowance
Totals 103,639 113,915
Acquired Loans - Total portfolio Allowance    
Performing loans 51 55
Potential problem loans 75 65
Impaired loans 193 191
Unallocated allowance
Totals $ 319 $ 311