REGULATORY MATTERS - Comparison of the Company's and Bank's Actual Capital Amounts and Ratios to Required Capital Amounts and Ratios (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jul. 31, 2017
Total capital to risk-weighted assets:
Actual, Amount	$ 236,625,000	$ 215,720,000
Actual, Ratio	13.32%	14.13%
Minimum Required for Capital Adequacy Purposes, Amount	$ 142,097,000	$ 122,111,000
Minimum Required for Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets:
Actual, Amount	$ 222,735,000	$ 202,861,000
Actual, Ratio	12.54%	13.29%
Minimum Required for Capital Adequacy Purposes, Amount	$ 106,572,000	$ 91,583,000
Minimum Required for Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 capital to average assets:
Actual, Amount	$ 222,735,000	$ 202,861,000
Actual, Ratio	11.04%	10.53%
Minimum Required for Capital Adequacy Purposes, Amount	$ 80,720,000	$ 77,048,000
Minimum Required for Capital Adequacy Purposes, Ratio	4.00%	4.00%
Common equity tier 1 capital to risk-weighted assets:
Actual, Amount	$ 212,425,000	$ 192,551,000
Actual, Ratio	11.96%	12.61%
Minimum Required for Capital Adequacy Purposes, Amount	$ 79,929,000	$ 68,687,000
Minimum Required for Capital Adequacy Purposes, Ratio	4.50%	4.50%
Bank
Total capital to risk-weighted assets:
Actual, Amount	$ 238,197,000	$ 206,490,000
Actual, Ratio	13.41%	13.53%
Minimum Required for Capital Adequacy Purposes, Amount	$ 142,079,000	$ 122,122,000
Minimum Required for Capital Adequacy Purposes, Ratio	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 177,599,000	$ 152,652,000
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 capital to risk-weighted assets:
Actual, Amount	$ 224,307,000	$ 193,631,000
Actual, Ratio	12.63%	12.68%
Minimum Required for Capital Adequacy Purposes, Amount	$ 106,560,000	$ 91,591,000
Minimum Required for Capital Adequacy Purposes, Ratio	6.00%	6.00%
To Be Well Capitalized Under Prompt Correct Action Provisions, Amount	$ 142,079,000	$ 122,122,000
To Be Well Capitalized Under Prompt Correct Action Provisions, Ratio	8.00%	8.00%
Tier 1 capital to average assets:
Actual, Amount	$ 224,307,000	$ 193,631,000
Actual, Ratio	11.12%	10.05%
Minimum Required for Capital Adequacy Purposes, Amount	$ 80,711,000	$ 77,054,000
Minimum Required for Capital Adequacy Purposes, Ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 100,889,000	$ 96,318,000
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Common equity tier 1 capital to risk-weighted assets:
Actual, Amount	$ 224,307,000	$ 193,631,000
Actual, Ratio	12.63%	12.68%
Minimum Required for Capital Adequacy Purposes, Amount	$ 79,920,000	$ 68,694,000
Minimum Required for Capital Adequacy Purposes, Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 115,439,000	$ 99,224,000
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Federal Home Loan Bank advances | Other Subordinated Debentures, 2.50%
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stated interest rate	25.00%		2.50%
Federal Home Loan Bank advances | Subordinated Debentures II, Subordinated Debentures III, and DCB Debentures I
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Debenture issued	$ 10,310,000	$ 10,310,000