FAIR VALUE, Asset Quantitative Information (Details) $ in Thousands	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans	$ 2,615	$ 1,504
Other real estate owned	11,584	12,273
Residential Real Estate [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned	$ 297	$ 206
Other real estate owned, valuation technique [Extensible List]	Sales Comparison [Member]	Sales Comparison [Member]
Other real estate owned, measurement input [Extensible List]	Adjustment for Estimated Realizable Value [Member]	Adjustment for Estimated Realizable Value [Member]
Residential Real Estate [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Minimum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned, unobservable inputs	0.419	0.002
Residential Real Estate [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Maximum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned, unobservable inputs	0.659	0.598
Residential Real Estate [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Weighted Average [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned, unobservable inputs	0.546	0.181
Multifamily Real Estate [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned	$ 10,070	$ 10,838
Other real estate owned, valuation technique [Extensible List]	Income Approach [Member]	Income Approach [Member]
Other real estate owned, measurement input [Extensible List]	Adjustment for Differences in Net Operating Income Expectations [Member]	Adjustment for Differences in Net Operating Income Expectations [Member]
Multifamily Real Estate [Member] \| Adjustment for Differences in Net Operating Income Expectations [Member] \| Income Approach [Member] \| Minimum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned, unobservable inputs	0.458	0.420
Multifamily Real Estate [Member] \| Adjustment for Differences in Net Operating Income Expectations [Member] \| Income Approach [Member] \| Maximum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned, unobservable inputs	0.703	0.704
Multifamily Real Estate [Member] \| Adjustment for Differences in Net Operating Income Expectations [Member] \| Income Approach [Member] \| Weighted Average [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned, unobservable inputs	0.491	0.455
Commercial Real Estate [Member] \| Owner Occupied [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans		$ 250
Other real estate owned	$ 817	$ 829
Other real estate owned, valuation technique [Extensible List]	Sales Comparison [Member]	Sales Comparison [Member]
Other real estate owned, measurement input [Extensible List]	Adjustment for Estimated Realizable Value [Member]	Adjustment for Estimated Realizable Value [Member]
Commercial Real Estate [Member] \| Owner Occupied [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Minimum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans, unobservable inputs		0.738
Other real estate owned, unobservable inputs	0.221	0.221
Commercial Real Estate [Member] \| Owner Occupied [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Maximum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans, unobservable inputs		0.738
Other real estate owned, unobservable inputs	0.285	0.268
Commercial Real Estate [Member] \| Owner Occupied [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Weighted Average [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans, unobservable inputs		0.738
Other real estate owned, unobservable inputs	0.263	0.252
Commercial Real Estate [Member] \| Non-Owner Occupied [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans	$ 2,502	$ 1,080
Commercial Real Estate [Member] \| Non-Owner Occupied [Member] \| Adjustment for Differences in Net Operating Income Expectations [Member] \| Income Approach [Member] \| Minimum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans, unobservable inputs	0.201	0.147
Commercial Real Estate [Member] \| Non-Owner Occupied [Member] \| Adjustment for Differences in Net Operating Income Expectations [Member] \| Income Approach [Member] \| Maximum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans, unobservable inputs	0.471	0.374
Commercial Real Estate [Member] \| Non-Owner Occupied [Member] \| Adjustment for Differences in Net Operating Income Expectations [Member] \| Income Approach [Member] \| Weighted Average [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans, unobservable inputs	0.247	0.252
Commercial and Industrial [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans	$ 113	$ 174
Commercial and Industrial [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Minimum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans, unobservable inputs	0.617	0.500
Commercial and Industrial [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Maximum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans, unobservable inputs	0.918	0.850
Commercial and Industrial [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Weighted Average [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Impaired loans, unobservable inputs	0.643	0.620
Construction and Land [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned	$ 400	$ 400
Other real estate owned, valuation technique [Extensible List]	Sales Comparison [Member]	Sales Comparison [Member]
Other real estate owned, measurement input [Extensible List]	Adjustment for Estimated Realizable Value [Member]	Adjustment for Estimated Realizable Value [Member]
Construction and Land [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Minimum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned, unobservable inputs	0.503	0.503
Construction and Land [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Maximum [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned, unobservable inputs	0.986	0.986
Construction and Land [Member] \| Adjustment for Estimated Realizable Value [Member] \| Sales Comparison [Member] \| Weighted Average [Member]
Significant Unobservable Inputs Related to Assets and Liabilities Measured at Fair Value [Abstract]
Other real estate owned, unobservable inputs	0.805	0.805

PREMIER FINANCIAL BANCORP INC 10-Q