REGULATORY CAPITAL REQUIREMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Net profits period for accessing dividends declarable (years)	2 years
Declarable dividends without prior approval for next fiscal year	$ 36,100
Actual	192,960	$ 182,239
Tier 1 Capital (to Risk Weighted Assets):
Actual	175,216	165,859
Common Equity Tier 1 Capital (to Risk Weighted Assets):
Actual	175,216	165,859
Tier 1 Capital (to Average Assets):
Actual	$ 175,216	$ 165,859
Total Capital (to Risk Weighted Assets):
Capital to Risk Weighted Assets	13.62%	13.98%
Tier One Risk Based Capital to Risk Weighted Assets	12.37%	12.73%
Common Equity Tier 1 Capital to Risk Weighted Assets	12.37%	12.73%
Leverage Ratios [Abstract]
Tier One Leverage Capital to Average Assets (in hundredths)	7.90%	9.35%
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual	$ 185,606	$ 175,062
Minimal Capital Adequacy	113,182	104,136
Minimal Capital Adequacy with Capital Buffer	148,551	136,679
To Be Well Capitalized Under Prompt Corrective Action Provisions	141,478	130,170
Tier 1 Capital (to Risk Weighted Assets):
Actual	167,881	158,702
Minimal Capital Adequacy	84,887	78,102
Minimal Capital Adequacy with Capital Buffer	120,256	110,645
To Be Well Capitalized Under Prompt Corrective Action Provisions	113,182	104,136
Common Equity Tier 1 Capital (to Risk Weighted Assets):
Actual	167,881	158,702
Minimal Capital Adequacy	63,665	58,577
Minimal Capital Adequacy with Capital Buffer	99,034	91,119
To Be Well Capitalized Under Prompt Corrective Action Provisions	91,960	84,611
Tier 1 Capital (to Average Assets):
Actual	167,881	158,702
Minimal Capital Adequacy	88,474	70,719
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 110,592	$ 88,399
Total Capital (to Risk Weighted Assets):
Capital to Risk Weighted Assets	13.12%	13.45%
Capital Required To Be Adequately Capitalized to Risk Weighted Assets	8.00%	8.00%
Capital Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets	10.50%	10.50%
Capital Required To Be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Tier One Risk Based Capital to Risk Weighted Assets	11.87%	12.19%
Tier One Risk Based Capital Required To Be Adequately Capitalized to Risk Weighted Assets	6.00%	6.00%
Tier One Risk Based Capital Required for Capital Adequacy With Capital Buffer to Risk Weighted Assets	8.50%	8.50%
Tier One Risk Based Capital Required To Be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Common Equity Tier 1 Capital to Risk Weighted Assets	11.87%	12.19%
Common Equity Tier 1 Capital Required to be Adequately Capitalized to Risk Weighted Assets	4.50%	4.50%
Common Equity Tier One Risk Based Capital Requirement for Capital Adequacy with Capital Buffer to Risk Weighted Assets	7.00%	7.00%
Common Equity Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Leverage Ratios [Abstract]
Tier One Leverage Capital to Average Assets (in hundredths)	7.59%	8.98%
Tier One Leverage Capital Required To Be Adequately Capitalized to Average Assets (in hundredths)	4.00%	4.00%
Tier One Leverage Capital Required To Be Well Capitalized to Average Assets (in hundredths)	5.00%	5.00%