REGULATORY CAPITAL REQUIREMENTS (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 15, 2004	Dec. 31, 2019	Dec. 31, 2016	Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations
Capital conservation buffer (as a percent)		2.50%	0.625%	0.00%
Tier 1 Leverage Capital
Tier One Leverage Capital, Actual Amount			$ 173,945	$ 165,799
Tier One Leverage Capital, Actual Percent			8.71%	8.77%
Tier One Leverage Capital For Capital Adequacy Purposes, Amount			$ 79,903	$ 75,646
Tier One Leverage Capital For Capital Adequacy Purposes, Percent			4.00%	4.00%
Tier One Leverage Capital Fully Phased-in, with Capital Conservation Buffers, Amount			$ 79,903	$ 75,646
Tier One Leverage Capital Required Fully Phased In With Capital Conservation Buffers Percent			4.00%	4.00%
Tier 1 Risk-Based Capital
Tier One Risk Based Capital, Actual Amount			$ 173,945	$ 165,799
Tier One Risk Based Capital, Actual Percent			14.04%	14.63%
Tier One Risk Based Capital For Capital Adequacy Purposes, Amount			$ 74,360	$ 68,005
Tier One Risk Based Capital For Capital Adequacy Purposes, Percent			6.00%	6.00%
Tier One Risk Based Capital Fully Phased-in, with Capital Conservation Buffers, Amount			$ 105,344	$ 96,341
Tier One Risk Based Capital Fully Phased-in, with Capital Conservation Buffers, Percent			8.50%	8.50%
Total Risk-Based Capital
Total Risk-Based Capital, Actual Amount			$ 187,624	$ 178,754
Total Risk-Based Capital, Actual Percent			15.14%	15.77%
Total Risk Based Capital For Capital Adequacy Purposes, Amount			$ 99,147	$ 90,673
Total Risk Based Capital For Capital Adequacy Purposes, Percent			8.00%	8.00%
Total Risk Based Capital Fully Phased-in, with Capital Conservation Buffers, Amount			$ 130,130	$ 119,009
Total Risk Based Capital Fully Phased-in, with Capital Conservation Buffers, Percent			10.50%	10.50%
Common Equity Tier 1 Capital
Common Equity Tier One Leverage Capital, Actual Amount			$ 153,945	$ 145,799
Common Equity Tier One Leverage Capital, Actual Percent			12.42	12.86
Common Equity Tier One Leverage Capital For Capital Adequacy Purposes, Amount			$ 55,770	$ 51,004
Common Equity Tier One Leverage Capital For Capital Adequacy Purposes, Percent			4.50	4.50
Common Equity Tier One Leverage Capital Fully Phased-in, with Capital Conservation Buffers, Amount			$ 86,754	$ 79,339
Common Equity Tier One Leverage Capital Fully Phased-in, with Capital Conservation Buffers, Percent			7.00%	7.00%
Private placement, trust preferred securities, aggregate amount	$ 20,620
Merchants Bank
Tier 1 Leverage Capital
Tier One Leverage Capital, Actual Amount			$ 170,732	$ 164,446
Tier One Leverage Capital, Actual Percent			8.53%	8.64%
Tier One Leverage Capital For Capital Adequacy Purposes, Amount			$ 80,028	$ 76,112
Tier One Leverage Capital For Capital Adequacy Purposes, Percent			4.00%	4.00%
Tier One Leverage Capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount			$ 100,035	$ 95,139
Tier One Leverage Capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Percent			5.00%	5.00%
Tier One Leverage Capital Fully Phased-in, with Capital Conservation Buffers, Amount			$ 80,028	$ 76,112
Tier One Leverage Capital Required Fully Phased In With Capital Conservation Buffers Percent			4.00%	4.00%
Tier 1 Risk-Based Capital
Tier One Risk Based Capital, Actual Amount			$ 170,732	$ 164,446
Tier One Risk Based Capital, Actual Percent			13.72%	14.44%
Tier One Risk Based Capital For Capital Adequacy Purposes, Amount			$ 74,662	$ 68,352
Tier One Risk Based Capital For Capital Adequacy Purposes, Percent			6.00%	6.00%
Tier One Risk Based Capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount			$ 99,550	$ 91,136
Tier One Risk Based Capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Percent			8.00%	8.00%
Tier One Risk Based Capital Fully Phased-in, with Capital Conservation Buffers, Amount			$ 105,771	$ 96,832
Tier One Risk Based Capital Fully Phased-in, with Capital Conservation Buffers, Percent			8.50%	8.50%
Total Risk-Based Capital
Total Risk-Based Capital, Actual Amount			$ 184,411	$ 177,401
Total Risk-Based Capital, Actual Percent			14.82%	15.57%
Total Risk Based Capital For Capital Adequacy Purposes, Amount			$ 99,550	$ 91,136
Total Risk Based Capital For Capital Adequacy Purposes, Percent			8.00%	8.00%
Total Risk Based Capital To Be Well-Capitalized Under Prompt Corrective Action Provisions, Amount			$ 124,437	$ 113,920
Total Risk Based Capital To Be Well-Capitalized Under Prompt Corrective Action Provisions, Percent			10.00%	10.00%
Total Risk Based Capital Fully Phased-in, with Capital Conservation Buffers, Amount			$ 130,659	$ 119,616
Total Risk Based Capital Fully Phased-in, with Capital Conservation Buffers, Percent			10.50%	10.50%
Common Equity Tier 1 Capital
Common Equity Tier One Leverage Capital, Actual Amount			$ 170,732	$ 164,446
Common Equity Tier One Leverage Capital, Actual Percent			13.72	14.44
Common Equity Tier One Leverage Capital For Capital Adequacy Purposes, Amount			$ 55,997	$ 51,264
Common Equity Tier One Leverage Capital For Capital Adequacy Purposes, Percent			4.50	4.50
Common Equity Tier One Leverage Capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount			$ 80,884	$ 74,048
Common Equity Tier One Leverage Capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Percent			6.50	6.50
Common Equity Tier One Leverage Capital Fully Phased-in, with Capital Conservation Buffers, Amount			$ 87,106	$ 79,744
Common Equity Tier One Leverage Capital Fully Phased-in, with Capital Conservation Buffers, Percent			7.00%	7.00%