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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Investment Securities |
Schedule of summary of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At December 31, 2021
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collaterized mortgage obligations | ​ | $ | 21,730 | ​ | $ | 169 | ​ | $ | (211) | ​ | $ | 21,688
Agency mortgage-backed securities | ​ |  | 56,252 | ​ |  | 356 | ​ |  | (419) | ​ |  | 56,189
Municipal securities | ​ | ​ | 44,594 | ​ | ​ | 811 | ​ | ​ | (180) | ​ | ​ | 45,225
U.S. Government agency securities | ​ | ​ | 32,616 | ​ | ​ | 4 | ​ | ​ | (1,269) | ​ | ​ | 31,351
Corporate securities | ​ | ​ | 1,500 | ​ | ​ | — | ​ | ​ | (26) | ​ | ​ | 1,474
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale | ​ | $ | 156,692 | ​ | $ | 1,340 | ​ | $ | (2,105) | ​ | $ | 155,927
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At December 31, 2020
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collaterized 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
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2021
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(dollars in thousands) | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collaterized mortgage obligations | ​ | $ | 7,917 | ​ | $ | (194) | ​ | $ | 876 | ​ | $ | (17) | ​ | $ | 8,793 | ​ | $ | (211)
Agency mortgage-backed securities | ​ | ​ | 42,109 | ​ | ​ | (414) | ​ | ​ | 197 | ​ | ​ | (5) | ​ | ​ | 42,306 | ​ | ​ | (419)
Municipal securities | ​ | ​ | 18,603 | ​ | ​ | (180) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 18,603 | ​ | ​ | (180)
U.S. Government agency securities | ​ |  | 13,976 | ​ | ​ | (420) | ​ | ​ | 15,942 | ​ | ​ | (849) | ​ | ​ | 29,918 | ​ | ​ | (1,269)
Corporate securities | ​ |  | 1,474 | ​ |  | (26) | ​ |  | — | ​ |  | — | ​ |  | 1,474 | ​ |  | (26)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 84,079 | ​ | $ | (1,234) | ​ | $ | 17,015 | ​ | $ | (871) | ​ | $ | 101,094 | ​ | $ | (2,105)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2020
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(dollars in thousands) | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collaterized mortgage obligations | ​ | $ | 201 | ​ | $ | — | ​ | $ | 1,188 | ​ | $ | (14) | ​ | $ | 1,389 | ​ | $ | (14)
Agency mortgage-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 566 | ​ | ​ | (10) | ​ | ​ | 566 | ​ | ​ | (10)
Municipal securities | ​ | ​ | 851 | ​ | ​ | (2) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 851 | ​ | ​ | (2)
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2021
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | — | ​ | $ | —
Due over one to five years | ​ |  | 3,448 | ​ |  | 3,507
Due over five to ten years | ​ |  | 11,015 | ​ |  | 10,902
Due over ten years | ​ |  | 62,747 | ​ |  | 62,167
Collaterized mortgage obligations | ​ | ​ | 23,230 | ​ | ​ | 23,162
Agency mortgage-backed securities | ​ |  | 56,252 | ​ |  | 56,189
​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale | ​ | $ | 156,692 | ​ | $ | 155,927
​

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