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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Investment Securities |
Schedule of summary of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At December 31, 2023
​ | ​ | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collateralized mortgage obligations | ​ | $ | 15,962 | ​ | $ | 8 | ​ | $ | (2,309) | ​ | $ | 13,661
Agency mortgage-backed securities | ​ |  | 51,930 | ​ |  | — | ​ |  | (5,816) | ​ |  | 46,114
Municipal securities | ​ | ​ | 42,990 | ​ | ​ | 4 | ​ | ​ | (9,265) | ​ | ​ | 33,729
U.S. Government agency securities | ​ | ​ | 45,406 | ​ | ​ | — | ​ | ​ | (7,712) | ​ | ​ | 37,694
Corporate securities | ​ | ​ | 1,500 | ​ | ​ | — | ​ | ​ | (216) | ​ | ​ | 1,284
U.S. Treasury securities | ​ |  | 6,999 | ​ |  | — | ​ |  | (54) | ​ |  | 6,945
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale | ​ | $ | 164,787 | ​ | $ | 12 | ​ | $ | (25,372) | ​ | $ | 139,427
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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
​
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time in continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2023
​ | ​ | 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 | ​ | $ | 492 | ​ | $ | (1) | ​ | $ | 11,927 | ​ | $ | (2,308) | ​ | $ | 12,419 | ​ | $ | (2,309)
Agency mortgage-backed securities | ​ | ​ | 5 | ​ | ​ | — | ​ | ​ | 46,109 | ​ | ​ | (5,816) | ​ | ​ | 46,114 | ​ | ​ | (5,816)
Municipal securities | ​ | ​ | 2,978 | ​ | ​ | (39) | ​ | ​ | 28,667 | ​ | ​ | (9,226) | ​ | ​ | 31,645 | ​ | ​ | (9,265)
U.S. Government agency securities | ​ |  | 220 | ​ | ​ | (1) | ​ | ​ | 37,474 | ​ | ​ | (7,711) | ​ | ​ | 37,694 | ​ | ​ | (7,712)
Corporate securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,284 | ​ | ​ | (216) | ​ | ​ | 1,284 | ​ | ​ | (216)
U.S. Treasury securities | ​ |  | — | ​ |  | — | ​ |  | 6,944 | ​ |  | (54) | ​ |  | 6,944 | ​ |  | (54)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | $ | 3,695 | ​ | $ | (41) | ​ | $ | 132,405 | ​ | $ | (25,331) | ​ | $ | 136,100 | ​ | $ | (25,372)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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)
Schedule of contractual maturities of investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2023
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Due within one year | ​ | $ | 20,998 | ​ | $ | 20,814
Due over one to five years | ​ |  | 5,080 | ​ |  | 4,584
Due over five to ten years | ​ |  | 14,665 | ​ |  | 12,621
Due over ten years | ​ |  | 56,152 | ​ |  | 41,633
Collateralized mortgage obligations | ​ | ​ | 15,962 | ​ | ​ | 13,661
Agency mortgage-backed securities | ​ |  | 51,930 | ​ |  | 46,114
​ | ​ | ​ | ​ | ​ | ​ | ​
Total securities available for sale | ​ | $ | 164,787 | ​ | $ | 139,427
​

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