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FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets Measured at Fair Value |  |
Total, fair value | $ 366,376 | $ 349,332
Impaired loans with a valuation allowance | 9,354 | 8,082
Valuation allowance | (1,124) | (925)
Impaired loans, net | 9,354 | 8,082
Interest rate swap agreements |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 3,933 | 6,566
Fair value of the derivative liability | 3,933 | 6,566
Obligations of the U.S. Treasury |  |
Assets Measured at Fair Value |  |
Total, fair value | 15,085 | 12,182
Obligations of U.S. Government agencies |  |
Assets Measured at Fair Value |  |
Total, fair value | 24,992 | 26,344
Obligations Of States And Political Subdivisions Tax Exempt |  |
Assets Measured at Fair Value |  |
Total, fair value | 125,118 | 122,401
Obligations Of States And Political Subdivisions Taxable |  |
Assets Measured at Fair Value |  |
Total, fair value | 52,538 | 47,452
Residential Passthrough Securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 39,757 | 38,176
Residential Collateralized Mortgage Obligations |  |
Assets Measured at Fair Value |  |
Total, fair value | 53,971 | 57,467
Commercial Mortgage Backed Securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 54,915 | 45,310
Recurring fair value measurements |  |
Assets Measured at Fair Value |  |
Total, fair value | 366,376 | 349,332
Marketable equity security | 982 | 1,000
Servicing rights | 1,956 | 1,689
Total asset fair value measurements | 373,247 | 358,587
Recurring fair value measurements | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Marketable equity security | 982 | 1,000
Servicing rights | 0 | 0
Total asset fair value measurements | 982 | 1,000
Recurring fair value measurements | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 366,376 | 349,332
Marketable equity security | 0 | 0
Servicing rights | 0 | 0
Total asset fair value measurements | 370,309 | 355,898
Recurring fair value measurements | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Marketable equity security | 0 | 0
Servicing rights | 1,956 | 1,689
Total asset fair value measurements | 1,956 | 1,689
Recurring fair value measurements | Interest rate swap agreements |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 3,933 | 6,566
Fair value of the derivative liability | 3,933 | 6,566
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 | 3,933 | 6,566
Fair value of the derivative liability | 3,933 | 6,566
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 | 15,085 | 12,182
Recurring fair value measurements | Obligations of the U.S. Treasury | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Obligations of the U.S. Treasury | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 15,085 | 12,182
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 | 24,992 | 26,344
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 | 24,992 | 26,344
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 | Obligations Of States And Political Subdivisions Tax Exempt |  |
Assets Measured at Fair Value |  |
Total, fair value | 125,118 | 122,401
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 | 125,118 | 122,401
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 | 52,538 | 47,452
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 | 52,538 | 47,452
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 | 39,757 | 38,176
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 | 39,757 | 38,176
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 | 53,971 | 57,467
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 | 53,971 | 57,467
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 | 54,915 | 45,310
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 | 54,915 | 45,310
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 | 9,702 | 8,495
Impaired loans with a valuation allowance | 9,354 | 8,082
Valuation allowance | (1,124) | (925)
Impaired loans, net | 8,230 | 7,157
Foreclosed assets held for sale | 1,472 | 1,338
Nonrecurring fair value measurements | Level 1 |  |
Assets Measured at Fair Value |  |
Total asset fair value measurements | 0 | 0
Impaired loans with a valuation allowance | 0 | 0
Valuation allowance | 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 with a valuation allowance | 0 | 0
Valuation allowance | 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 | 9,702 | 8,495
Impaired loans with a valuation allowance | 9,354 | 8,082
Valuation allowance | (1,124) | (925)
Impaired loans, net | 8,230 | 7,157
Foreclosed assets held for sale | $ 1,472 | $ 1,338

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