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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Investment Securities |
Schedule of summary of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At December 31, 2022
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collateralized mortgage obligations | ​ | $ | 17,596 | ​ | $ | 7 | ​ | $ | (2,348) | ​ | $ | 15,255
Agency mortgage-backed securities | ​ |  | 58,801 | ​ |  | — | ​ |  | (6,908) | ​ |  | 51,893
Municipal securities | ​ | ​ | 43,092 | ​ | ​ | 1 | ​ | ​ | (10,796) | ​ | ​ | 32,297
U.S. Government agency securities | ​ | ​ | 45,471 | ​ | ​ | — | ​ | ​ | (8,891) | ​ | ​ | 36,580
Corporate securities | ​ | ​ | 1,500 | ​ | ​ | — | ​ | ​ | (175) | ​ | ​ | 1,325
U.S. Treasury securities | ​ |  | 6,993 | ​ |  | — | ​ |  | (210) | ​ |  | 6,783
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale | ​ | $ | 173,453 | ​ | $ | 8 | ​ | $ | (29,328) | ​ | $ | 144,133
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At December 31, 2021
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collateralized 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
​
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time in continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2022
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(dollars in thousands) | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collateralized mortgage obligations | ​ | $ | 8,315 | ​ | $ | (364) | ​ | $ | 6,127 | ​ | $ | (1,984) | ​ | $ | 14,442 | ​ | $ | (2,348)
Agency mortgage-backed securities | ​ | ​ | 20,029 | ​ | ​ | (1,308) | ​ | ​ | 31,865 | ​ | ​ | (5,600) | ​ | ​ | 51,894 | ​ | ​ | (6,908)
Municipal securities | ​ | ​ | 18,456 | ​ | ​ | (5,438) | ​ | ​ | 13,340 | ​ | ​ | (5,358) | ​ | ​ | 31,796 | ​ | ​ | (10,796)
U.S. Government agency securities | ​ |  | 13,526 | ​ | ​ | (474) | ​ | ​ | 22,767 | ​ | ​ | (8,417) | ​ | ​ | 36,293 | ​ | ​ | (8,891)
Corporate securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,325 | ​ | ​ | (175) | ​ | ​ | 1,325 | ​ | ​ | (175)
U.S. Treasury securities | ​ |  | 6,783 | ​ |  | (210) | ​ |  | — | ​ |  | — | ​ |  | 6,783 | ​ |  | (210)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 67,109 | ​ | $ | (7,794) | ​ | $ | 75,424 | ​ | $ | (21,534) | ​ | $ | 142,533 | ​ | $ | (29,328)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collateralized 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)
​
Schedule of contractual maturities of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2022
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | — | ​ | $ | —
Due over one to five years | ​ |  | 22,235 | ​ |  | 21,505
Due over five to ten years | ​ |  | 15,891 | ​ |  | 13,348
Due over ten years | ​ |  | 58,930 | ​ |  | 42,132
Collateralized mortgage obligations | ​ | ​ | 17,596 | ​ | ​ | 15,255
Agency mortgage-backed securities | ​ |  | 58,801 | ​ |  | 51,893
​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale | ​ | $ | 173,453 | ​ | $ | 144,133
​

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