FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
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	13,374	$ 14,047
Securities available for sale	75,897	86,273
Carrying Amount
Financial assets:
Total financial assets	938,084	928,839
Financial liabilities:
Total financial liabilities	897,872	891,358
Estimated Fair Value
Financial assets:
Total financial assets	929,811	930,379
Financial liabilities:
Total financial liabilities	868,196	884,520
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	37,426	46,755
Level 1 | Estimated Fair Value
Financial assets:
Cash and cash equivalents	37,426	46,755
Level 2 | Carrying Amount
Financial assets:
Interest-bearing deposits	13,374	14,047
Securities available for sale	74,397	84,623
Federal Home Loan Bank stock	3,112	2,911
Financial liabilities:
Deposits	817,998	823,512
Borrowings	79,552	67,579
Level 2 | Estimated Fair Value
Financial assets:
Interest-bearing deposits	13,374	14,047
Securities available for sale	74,397	84,623
Federal Home Loan Bank stock	3,112	2,911
Financial liabilities:
Deposits	788,632	815,960
Borrowings	79,242	68,293
Level 3 | Carrying Amount
Financial assets:
Securities available for sale	1,500	1,650
Net loans	805,999	776,837
Accrued interest receivable	2,276	2,016
Financial liabilities:
Accrued interest payable	322	267
Level 3 | Estimated Fair Value
Financial assets:
Securities available for sale	1,500	1,650
Net loans	797,726	778,377
Accrued interest receivable	2,276	2,016
Financial liabilities:
Accrued interest payable	$ 322	$ 267