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INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2021
INVESTMENT SECURITIES |
Schedule of summary of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At September 30, 2021
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collateralized mortgage obligations | ​ | $ | 23,493 | ​ | $ | 260 | ​ | $ | (132) | ​ | $ | 23,621
Agency mortgage-backed securities | ​ | ​ | 29,432 | ​ | ​ | 525 | ​ | ​ | (235) | ​ | ​ | 29,722
Municipal securities | ​ | ​ | 44,629 | ​ | ​ | 652 | ​ | ​ | (642) | ​ | ​ | 44,639
Corporate Securities | ​ | ​ | 1,500 | ​ | ​ | — | ​ | ​ | (10) | ​ | ​ | 1,490
U.S. Government agency securities | ​ | ​ | 64,965 | ​ | ​ | 26 | ​ | ​ | (1,636) | ​ | ​ | 63,355
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale | ​ | $ | 164,019 | ​ | $ | 1,463 | ​ | $ | (2,655) | ​ | $ | 162,827
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At December 31, 2020
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collateralized mortgage obligations | ​ | $ | 24,261 | ​ | $ | 396 | ​ | $ | (14) | ​ | $ | 24,643
Agency mortgage-backed securities | ​ | ​ | 26,072 | ​ |  | 886 | ​ |  | (10) | ​ |  | 26,948
Municipal securities | ​ | ​ | 28,675 | ​ | ​ | 740 | ​ | ​ | (2) | ​ | ​ | 29,413
Corporate Securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
U.S. Government agency securities | ​ | ​ | 33,346 | ​ | ​ | 9 | ​ | ​ | (310) | ​ | ​ | 33,045
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale | ​ | $ | 112,354 | ​ | $ | 2,031 | ​ | $ | (336) | ​ | $ | 114,049
​
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time in continuous unrealized loss position | The gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2021 and December 31, 2020 are as follows: ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 30, 2021 | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
Securities available for sale: | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
​ | ​ | (dollars in thousands)
Collateralized mortgage obligations |  | $ | 6,747 |  | $ | (126) |  | $ | 953 | ​ | $ | (6) |  | $ | 7,700 |  | $ | (132)
Agency mortgage-backed securities | ​ | ​ | 9,738 | ​ | ​ | (229) | ​ | ​ | 221 | ​ | ​ | (6) | ​ | ​ | 9,959 | ​ | ​ | (235)
Municipal securities | ​ | ​ | 25,335 | ​ | ​ | (642) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 25,335 | ​ | ​ | (642)
Corporate Securities | ​ | ​ | 1,490 | ​ | ​ | (10) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,490 | ​ | ​ | (10)
U.S. Government agency securities | ​ | ​ | 45,025 | ​ | ​ | (1,062) | ​ | ​ | 12,499 | ​ | ​ | (574) | ​ | ​ | 57,524 | ​ | ​ | (1,636)
​ |  | $ | 88,335 |  | $ | (2,069) |  | $ | 13,673 | ​ | $ | (586) |  | $ | 102,008 |  | $ | (2,655)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
Securities available for sale: | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
​ | ​ | (dollars in thousands)
Collateralized mortgage obligations |  | $ | 201 | ​ | $ | — | ​ | $ | 1,188 | ​ | $ | (14) | ​ | $ | 1,389 | ​ | $ | (14)
Agency mortgage-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 566 | ​ | ​ | (10) | ​ | ​ | 566 | ​ | ​ | (10)
Municipal securities | ​ | ​ | 851 | ​ | ​ | (2) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 851 | ​ | ​ | (2)
Corporate Securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
U.S. Government agency securities | ​ | ​ | 24,160 | ​ | ​ | (308) | ​ | ​ | 481 | ​ | ​ | (2) | ​ | ​ | 24,641 | ​ | ​ | (310)
​ |  | $ | 25,212 |  | $ | (310) |  | $ | 2,235 | ​ | $ | (26) |  | $ | 27,447 |  | $ | (336)
Schedule of contractual maturities of investment securities | Shown below are contractual maturities of debt securities at September 30, 2021. Actual maturities may differ from contractual maturities because borrowers have the right to call or prepay obligations with or without call or prepayment penalties. ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At September 30, 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair | ​ | Yield
(dollars in thousands) |  | Cost | ​ | Value |  | (1), (2)
Available for sale securities maturing: | ​ |  | ​ | ​ |  |  | ​ |  |  | ​
Within one year | ​ | $ | — | ​ | $ | — | ​ | ​ | — | %
Over one to five years | ​ | ​ | 2,134 | ​ | ​ | 2,161 | ​ | ​ | 1.94 | %
Over five to ten years | ​ |  | 19,283 | ​ |  | 19,348 | ​ |  | 1.61 | %
Over ten years | ​ |  | 142,602 | ​ |  | 141,318 | ​ |  | 2.13 | %
Total debt securities | ​ | $ | 164,019 | ​ | $ | 162,827 | ​ |  | ​ | ​
_____________________ (1) Yields are stated as book yields which are adjusted for amortization and accretion of purchase premiums and discounts, respectively. (2) Yields on tax-exempt obligations are computed on a tax-equivalent basis.

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