REGULATORY MATTERS - Comparison of the Company's and Bank's Actual Capital Amounts and Ratios to Required Capital Amounts and Ratios (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Total capital to risk-weighted assets:
Actual, Amount	$ 219,251,000	$ 215,720,000
Actual, Ratio	14.06%	14.13%
Minimum Required for Capital Adequacy Purposes, Amount	$ 124,722,000	$ 122,111,000
Minimum Required for Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets:
Actual, Amount	$ 205,876,000	$ 202,861,000
Actual, Ratio	13.21%	13.29%
Minimum Required for Capital Adequacy Purposes, Amount	$ 93,541,000	$ 91,583,000
Minimum Required for Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 capital to average assets:
Actual, Amount	$ 205,876,000	$ 202,861,000
Actual, Ratio	10.64%	10.53%
Minimum Required for Capital Adequacy Purposes, Amount	$ 77,389,000	$ 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	$ 195,566,000	$ 192,551,000
Actual, Ratio	12.54%	12.61%
Minimum Required for Capital Adequacy Purposes, Amount	$ 70,156,000	$ 68,687,000
Minimum Required for Capital Adequacy Purposes, Ratio	4.50%	4.50%
Subordinated Debentures | Subordinated Debentures II, Subordinated Debentures III, and DCB Debentures I
Common equity tier 1 capital to risk-weighted assets:
Debenture issued	$ 10,310,000	$ 10,310,000
Bank
Total capital to risk-weighted assets:
Actual, Amount	$ 212,015,000	$ 206,490,000
Actual, Ratio	13.60%	13.53%
Minimum Required for Capital Adequacy Purposes, Amount	$ 124,719,000	$ 122,122,000
Minimum Required for Capital Adequacy Purposes, Ratio	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 155,899,000	$ 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	$ 198,640,000	$ 193,631,000
Actual, Ratio	12.74%	12.68%
Minimum Required for Capital Adequacy Purposes, Amount	$ 93,539,000	$ 91,591,000
Minimum Required for Capital Adequacy Purposes, Ratio	6.00%	6.00%
To Be Well Capitalized Under Prompt Correct Action Provisions, Amount	$ 124,719,000	$ 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	$ 198,640,000	$ 193,631,000
Actual, Ratio	10.27%	10.05%
Minimum Required for Capital Adequacy Purposes, Amount	$ 77,391,000	$ 77,054,000
Minimum Required for Capital Adequacy Purposes, Ratio	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 96,738,000	$ 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	$ 198,640,000	$ 193,631,000
Actual, Ratio	12.74%	12.68%
Minimum Required for Capital Adequacy Purposes, Amount	$ 70,155,000	$ 68,694,000
Minimum Required for Capital Adequacy Purposes, Ratio	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 101,334,000	$ 99,224,000
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%