FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Measurements
Blended interest rate for determining fair value of nonaccrual loans (as a percent)	0.00%
Fair value of commitments	$ 0
Financial assets:
Interest-bearing deposits	11,391	$ 13,374
Marketable securities	73,902
Carrying Amount
Financial assets:
Total financial assets	938,250	938,084
Financial liabilities:
Total financial liabilities	897,096	897,872
Estimated Fair Value
Financial assets:
Total financial assets	928,562	929,811
Financial liabilities:
Total financial liabilities	861,970	868,196
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	40,427	37,426
Level 1 | Estimated Fair Value
Financial assets:
Cash and cash equivalents	40,427	37,426
Level 2 | Carrying Amount
Financial assets:
Interest-bearing deposits	11,391	13,374
Federal Home Loan Bank stock	3,112	3,112
Financial liabilities:
Deposits	806,797	817,998
Borrowings	90,002	79,552
Level 2 | Estimated Fair Value
Financial assets:
Interest-bearing deposits	11,391	13,374
Federal Home Loan Bank stock	3,112	3,112
Financial liabilities:
Deposits	772,589	788,632
Borrowings	89,084	79,242
Level 3 | Carrying Amount
Financial assets:
Net loans	807,340	805,999
Accrued interest receivable	2,078	2,276
Financial liabilities:
Accrued interest payable	297	322
Level 3 | Estimated Fair Value
Financial assets:
Net loans	797,652	797,726
Accrued interest receivable	2,078	2,276
Financial liabilities:
Accrued interest payable	297	322
Available-for-sale Securities
Financial assets:
Marketable securities	73,402	75,397
Available-for-sale Securities | Level 2 | Carrying Amount
Financial assets:
Marketable securities	72,402	74,397
Available-for-sale Securities | Level 2 | Estimated Fair Value
Financial assets:
Marketable securities	72,402	74,397
Available-for-sale Securities | Level 3 | Carrying Amount
Financial assets:
Marketable securities	1,000	1,000
Available-for-sale Securities | Level 3 | Estimated Fair Value
Financial assets:
Marketable securities	1,000	1,000
Corporate
Financial assets:
Marketable securities	24,222	24,391
US Agencies
Financial assets:
Marketable securities	16,657	16,846
US Agencies - MBS
Financial assets:
Marketable securities	11,677	12,716
Obligations of states and political subdivisions
Financial assets:
Marketable securities	20,846	21,444
Equity securities
Financial assets:
Marketable securities	500
Equity securities | Level 3 | Carrying Amount
Financial assets:
Marketable securities	500	500
Equity securities | Level 3 | Estimated Fair Value
Financial assets:
Marketable securities	$ 500	$ 500