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SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2020
SECURITIES |
Schedule of amortized cost and fair value of available-for-sale debt securities at | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | December 31, 2020
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
​ |  | Amortized |  | Holding |  | Holding |  | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of the U.S. Treasury | ​ | $ | 12,184 | ​ | $ | 0 | ​ | $ | (2) | ​ | $ | 12,182
Obligations of U.S. Government agencies | ​ | ​ | 25,349 | ​ | ​ | 1,003 | ​ | ​ | (8) | ​ | ​ | 26,344
Obligations of states and political subdivisions: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |
Tax-exempt | ​ |  | 116,427 | ​ |  | 6,000 | ​ |  | (26) | ​ |  | 122,401
Taxable | ​ |  | 45,230 | ​ |  | 2,246 | ​ |  | (24) | ​ |  | 47,452
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential pass-through securities | ​ |  | 36,853 | ​ |  | 1,323 | ​ |  | 0 | ​ |  | 38,176
Residential collateralized mortgage obligations | ​ |  | 56,048 | ​ |  | 1,428 | ​ |  | (9) | ​ |  | 57,467
Commercial mortgage-backed securities | ​ |  | 42,461 | ​ |  | 2,849 | ​ |  | 0 | ​ |  | 45,310
Total available-for-sale debt securities | ​ | $ | 334,552 | ​ | $ | 14,849 | ​ | $ | (69) | ​ | $ | 349,332
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | December 31, 2019
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ |  | ​ |  | Unrealized | ​ | Unrealized | ​ | ​ | ​
​ |  | Amortized |  | Holding |  | Holding |  | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of U.S. Government agencies | ​ | $ | 16,380 | ​ | $ | 620 | ​ | $ | 0 | ​ | $ | 17,000
Obligations of states and political subdivisions: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Tax-exempt | ​ |  | 68,787 | ​ |  | 2,011 | ​ |  | (38) | ​ |  | 70,760
Taxable | ​ |  | 35,446 | ​ |  | 927 | ​ |  | (70) | ​ |  | 36,303
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential pass-through securities | ​ |  | 58,875 | ​ |  | 472 | ​ |  | (137) | ​ |  | 59,210
Residential collateralized mortgage obligations | ​ |  | 115,025 | ​ |  | 308 | ​ |  | (610) | ​ |  | 114,723
Commercial mortgage-backed securities | ​ |  | 47,765 | ​ |  | 1,069 | ​ |  | (107) | ​ |  | 48,727
Total available-for-sale debt securities | ​ | $ | 342,278 | ​ | $ | 5,407 | ​ | $ | (962) | ​ | $ | 346,723
Schedule of gross unrealized losses and fair value of available-for-sale debt securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 |  | Less Than 12 Months |  | 12 Months or More |  | Total
(In Thousands) | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Obligations of the U.S. Treasury | ​ | $ | 9,159 | ​ | $ | (2) | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 9,159 | ​ | $ | (2)
Obligations of U.S. Government agencies | ​ | ​ | 4,992 | ​ | ​ | (8) | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 4,992 | ​ | ​ | (8)
Obligations of states and political subdivisions: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt | ​ | ​ | 3,811 | ​ | ​ | (26) | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 3,811 | ​ | ​ | (26)
Taxable | ​ |  | 5,235 | ​ |  | (24) | ​ |  | 0 | ​ |  | 0 | ​ |  | 5,235 | ​ |  | (24)
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential collateralized mortgage obligations | ​ |  | 2,861 | ​ |  | (9) | ​ |  | 0 | ​ |  | 0 | ​ |  | 2,861 | ​ |  | (9)
Total temporarily impaired available for sale debt securities | ​ | $ | 26,058 | ​ | $ | (69) | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 26,058 | ​ | $ | (69)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 |  | Less Than 12 Months |  | 12 Months or More |  | Total
(In Thousands) | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Obligations of states and political subdivisions: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Tax-exempt | ​ | $ | 6,429 | ​ | $ | (38) | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 6,429 | ​ | $ | (38)
Taxable | ​ |  | 5,624 | ​ |  | (68) | ​ |  | 161 | ​ |  | (2) | ​ |  | 5,785 | ​ |  | (70)
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Residential pass-through securities | ​ |  | 9,771 | ​ |  | (35) | ​ |  | 14,787 | ​ |  | (102) | ​ |  | 24,558 | ​ |  | (137)
Residential collateralized mortgage obligations | ​ |  | 31,409 | ​ |  | (195) | ​ |  | 30,535 | ​ |  | (415) | ​ |  | 61,944 | ​ |  | (610)
Commercial mortgage-backed securities | ​ |  | 0 | ​ |  | 0 | ​ |  | 8,507 | ​ |  | (107) | ​ |  | 8,507 | ​ |  | (107)
Total temporarily impaired available-for-sale debt securities | ​ | $ | 53,233 | ​ | $ | (336) | ​ | $ | 53,990 | ​ | $ | (626) | ​ | $ | 107,223 | ​ | $ | (962)
Schedule of gross realized gains and losses from available-for-sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) | ​ | 2020 | ​ | 2019
Gross realized gains from sales | ​ | $ | 222 | ​ | $ | 24
Gross realized losses from sales | ​ |  | (53) | ​ |  | (1)
Net realized gains | ​ | $ | 169 | ​ | $ | 23
Income tax provision related to net realized gains | ​ | $ | 35 | ​ | $ | 5
Schedule of the amortized cost and fair value of available-for-sale debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) | ​ | December 31, 2020
​ | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value
Due in one year or less | ​ | $ | 13,409 | ​ | $ | 13,506
Due from one year through five years | ​ |  | 46,172 | ​ |  | 47,758
Due from five years through ten years | ​ |  | 47,535 | ​ |  | 50,110
Due after ten years | ​ |  | 92,074 | ​ |  | 97,005
Sub-total | ​ |  | 199,190 | ​ |  | 208,379
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies: | ​ |  |  | ​ |  |
Residential pass-through securities | ​ |  | 36,853 | ​ |  | 38,176
Residential collateralized mortgage obligations | ​ |  | 56,048 | ​ |  | 57,467
Commercial mortgage-backed securities | ​ |  | 42,461 | ​ |  | 45,310
Total | ​ | $ | 334,552 | ​ | $ | 349,332

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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