FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets Measured at Fair Value
Total, fair value	$ 526,837	$ 517,679
Impaired loans with a valuation allowance	3,392	6,540
Valuation allowance	(427)	(740)
Impaired loans, net	3,392	6,540
Interest rate swap agreements
Assets Measured at Fair Value
Fair value derivative asset	1,619	3,104
Fair value of the derivative liability	1,619	3,104
Obligations of the U.S. Treasury
Assets Measured at Fair Value
Total, fair value	35,774	24,912
Obligations of U.S. Government agencies
Assets Measured at Fair Value
Total, fair value	22,785	24,091
Bank holding company debt securities
Assets Measured at Fair Value
Total, fair value	27,415	17,987
Obligations Of States And Political Subdivisions Tax Exempt
Assets Measured at Fair Value
Total, fair value	139,400	148,028
Obligations Of States And Political Subdivisions Taxable
Assets Measured at Fair Value
Total, fair value	63,898	72,765
Residential Passthrough Securities
Assets Measured at Fair Value
Total, fair value	106,043	98,181
Residential Collateralized Mortgage Obligations
Assets Measured at Fair Value
Total, fair value	44,761	44,247
Commercial Mortgage Backed Securities
Assets Measured at Fair Value
Total, fair value	86,761	87,468
Recurring fair value measurements
Assets Measured at Fair Value
Total, fair value	526,837	517,679
Marketable equity security	895	971
Servicing rights	2,640	2,329
Total asset fair value measurements	531,991	524,083
Recurring fair value measurements | Level 1
Assets Measured at Fair Value
Total, fair value	35,774	24,912
Marketable equity security	895	971
Servicing rights	0	0
Total asset fair value measurements	36,669	25,883
Recurring fair value measurements | Level 2
Assets Measured at Fair Value
Total, fair value	491,063	492,767
Marketable equity security	0	0
Servicing rights	0	0
Total asset fair value measurements	492,682	495,871
Recurring fair value measurements | Level 3
Assets Measured at Fair Value
Total, fair value	0	0
Marketable equity security	0	0
Servicing rights	2,640	2,329
Total asset fair value measurements	2,640	2,329
Recurring fair value measurements | Interest rate swap agreements
Assets Measured at Fair Value
Fair value derivative asset	1,619	3,104
Fair value of the derivative liability	1,619	3,104
Recurring fair value measurements | Interest rate swap agreements | Level 1
Assets Measured at Fair Value
Fair value derivative asset	0	0
Fair value of the derivative liability	0	0
Recurring fair value measurements | Interest rate swap agreements | Level 2
Assets Measured at Fair Value
Fair value derivative asset	1,619	3,104
Fair value of the derivative liability	1,619	3,104
Recurring fair value measurements | Interest rate swap agreements | Level 3
Assets Measured at Fair Value
Fair value derivative asset	0	0
Fair value of the derivative liability	0	0
Recurring fair value measurements | Obligations of the U.S. Treasury
Assets Measured at Fair Value
Total, fair value	35,774	24,912
Recurring fair value measurements | Obligations of the U.S. Treasury | Level 1
Assets Measured at Fair Value
Total, fair value	35,774	24,912
Recurring fair value measurements | Obligations of the U.S. Treasury | Level 2
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Obligations of the U.S. Treasury | Level 3
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Obligations of U.S. Government agencies
Assets Measured at Fair Value
Total, fair value	22,785	24,091
Recurring fair value measurements | Obligations of U.S. Government agencies | Level 1
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Obligations of U.S. Government agencies | Level 2
Assets Measured at Fair Value
Total, fair value	22,785	24,091
Recurring fair value measurements | Obligations of U.S. Government agencies | Level 3
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Bank holding company debt securities
Assets Measured at Fair Value
Total, fair value	27,415	17,987
Recurring fair value measurements | Bank holding company debt securities | Level 1
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Bank holding company debt securities | Level 2
Assets Measured at Fair Value
Total, fair value	27,415	17,987
Recurring fair value measurements | Bank holding company debt securities | Level 3
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Obligations Of States And Political Subdivisions Tax Exempt
Assets Measured at Fair Value
Total, fair value	139,400	148,028
Recurring fair value measurements | Obligations Of States And Political Subdivisions Tax Exempt | Level 1
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Obligations Of States And Political Subdivisions Tax Exempt | Level 2
Assets Measured at Fair Value
Total, fair value	139,400	148,028
Recurring fair value measurements | Obligations Of States And Political Subdivisions Tax Exempt | Level 3
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Obligations Of States And Political Subdivisions Taxable
Assets Measured at Fair Value
Total, fair value	63,898	72,765
Recurring fair value measurements | Obligations Of States And Political Subdivisions Taxable | Level 1
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Obligations Of States And Political Subdivisions Taxable | Level 2
Assets Measured at Fair Value
Total, fair value	63,898	72,765
Recurring fair value measurements | Obligations Of States And Political Subdivisions Taxable | Level 3
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Residential Passthrough Securities
Assets Measured at Fair Value
Total, fair value	106,043	98,181
Recurring fair value measurements | Residential Passthrough Securities | Level 1
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Residential Passthrough Securities | Level 2
Assets Measured at Fair Value
Total, fair value	106,043	98,181
Recurring fair value measurements | Residential Passthrough Securities | Level 3
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Residential Collateralized Mortgage Obligations
Assets Measured at Fair Value
Total, fair value	44,761	44,247
Recurring fair value measurements | Residential Collateralized Mortgage Obligations | Level 1
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Residential Collateralized Mortgage Obligations | Level 2
Assets Measured at Fair Value
Total, fair value	44,761	44,247
Recurring fair value measurements | Residential Collateralized Mortgage Obligations | Level 3
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Commercial Mortgage Backed Securities
Assets Measured at Fair Value
Total, fair value	86,761	87,468
Recurring fair value measurements | Commercial Mortgage Backed Securities | Level 1
Assets Measured at Fair Value
Total, fair value	0	0
Recurring fair value measurements | Commercial Mortgage Backed Securities | Level 2
Assets Measured at Fair Value
Total, fair value	86,761	87,468
Recurring fair value measurements | Commercial Mortgage Backed Securities | Level 3
Assets Measured at Fair Value
Total, fair value	0	0
Nonrecurring fair value measurements
Assets Measured at Fair Value
Total asset fair value measurements	3,470	6,484
Impaired loans, net	2,965	5,800
Foreclosed assets held for sale	505	684
Nonrecurring fair value measurements | Level 1
Assets Measured at Fair Value
Total asset fair value measurements	0	0
Impaired loans, net	0	0
Foreclosed assets held for sale	0	0
Nonrecurring fair value measurements | Level 2
Assets Measured at Fair Value
Total asset fair value measurements	0	0
Impaired loans, net	0	0
Foreclosed assets held for sale	0	0
Nonrecurring fair value measurements | Level 3
Assets Measured at Fair Value
Total asset fair value measurements	3,470	6,484
Impaired loans, net	2,965	5,800
Foreclosed assets held for sale	$ 505	$ 684