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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investment Securities [Abstract] |
Schedule of Available-for-Sale Securities Reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | Estimated
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 18,557 | ​ | $ | 4 | ​ | $ | 578 | ​ | $ | 17,983
Mortgage-backed | ​ |  | 86,254 | ​ |  | 1,634 | ​ |  | 746 | ​ |  | 87,142
Total | ​ | $ | 104,811 | ​ | $ | 1,638 | ​ | $ | 1,324 | ​ | $ | 105,125
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 23,600 | ​ | $ | 20 | ​ | $ | 83 | ​ | $ | 23,537
Mortgage-backed | ​ |  | 113,865 | ​ |  | 2,234 | ​ |  | 68 | ​ |  | 116,031
Total | ​ | $ | 137,465 | ​ | $ | 2,254 | ​ | $ | 151 | ​ | $ | 139,568
Schedule of Held-to-Maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | Estimated
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
Held-to-maturity securities: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 67,772 | ​ | $ | 26 | ​ | $ | 556 | ​ | $ | 67,242
Mortgage-backed | ​ | ​ | 169,802 | ​ | ​ | 36 | ​ | ​ | 2,302 | ​ | ​ | 167,536
States and political subdivisions | ​ |  | 400 | ​ |  | 2 | ​ |  | — | ​ |  | 402
Other debt securities | ​ |  | 12,527 | ​ |  | 133 | ​ |  | 5 | ​ |  | 12,655
Total | ​ | $ | 250,501 | ​ | $ | 197 | ​ | $ | 2,863 | ​ | $ | 247,835
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 18,893 | ​ | $ | 38 | ​ | $ | 43 | ​ | $ | 18,888
Mortgage-backed | ​ | ​ | 27,347 | ​ | ​ | 7 | ​ | ​ | 18 | ​ | ​ | 27,336
States and political subdivisions | ​ |  | 400 | ​ |  | 1 | ​ |  | — | ​ |  | 401
Other debt securities | ​ |  | 19,066 | ​ |  | 139 | ​ |  | 2 | ​ |  | 19,203
Total | ​ | $ | 65,706 | ​ | $ | 185 | ​ | $ | 63 | ​ | $ | 65,828
Available-For-Sale Securities and Held-to-Maturity, Continuous Unrealized Loss Position, Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than | ​ | More than | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 12 Months | ​ | 12 Months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(Dollars in thousands) | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 2,886 | ​ | $ | 113 | ​ | $ | 14,746 | ​ | $ | 465 | ​ | $ | 17,632 | ​ | $ | 578
Mortgage-backed | ​ |  | 37,837 | ​ |  | 723 | ​ |  | 3,947 | ​ |  | 23 | ​ |  | 41,784 | ​ |  | 746
Total | ​ | $ | 40,723 | ​ | $ | 836 | ​ | $ | 18,693 | ​ | $ | 488 | ​ | $ | 59,416 | ​ | $ | 1,324
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 61,371 | ​ | $ | 556 | ​ | $ | — | ​ | $ | — | ​ | $ | 61,371 | ​ | $ | 556
Mortgage-backed | ​ | ​ | 155,548 | ​ | ​ | 2,302 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 155,548 | ​ | ​ | 2,302
Other debt securities | ​ | ​ | 495 | ​ | ​ | 5 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 495 | ​ | ​ | 5
Total | ​ | $ | 217,414 | ​ | $ | 2,863 | ​ | $ | — | ​ | $ | — | ​ | $ | 217,414 | ​ | $ | 2,863
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than | ​ | More than | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 12 Months | ​ | 12 Months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(Dollars in thousands) | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 14,919 | ​ | $ | 82 | ​ | $ | 236 | ​ | $ | 1 | ​ | $ | 15,155 | ​ | $ | 83
Mortgage-backed | ​ |  | 11,869 | ​ |  | 68 | ​ |  | — | ​ |  | — | ​ |  | 11,869 | ​ |  | 68
Total | ​ | $ | 26,788 | ​ | $ | 150 | ​ | $ | 236 | ​ | $ | 1 | ​ | $ | 27,024 | ​ | $ | 151
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 6,646 | ​ | $ | 43 | ​ | $ | — | ​ | $ | — | ​ | $ | 6,646 | ​ | $ | 43
Mortgage-backed | ​ | ​ | 5,093 | ​ | ​ | 18 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,093 | ​ | ​ | 18
Other debt securities | ​ |  | 498 | ​ |  | 2 | ​ |  | — | ​ |  | — | ​ |  | 498 | ​ |  | 2
Total | ​ | $ | 12,237 | ​ | $ | 63 | ​ | $ | — | ​ | $ | — | ​ | $ | 12,237 | ​ | $ | 63
Schedule of Securities Debt Maturities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available for sale | ​ | Held to maturity
​ |  | Amortized |  | ​ | ​ |  | Amortized |  | ​ | ​
(Dollars in thousands) | ​ | Cost | ​ | Fair Value | ​ | Cost | ​ | Fair Value
Due in one year or less | ​ | $ | — | ​ | $ | — | ​ | $ | 2,921 | ​ | $ | 2,954
Due after one year through five years | ​ |  | 799 | ​ |  | 825 | ​ |  | 9,982 | ​ |  | 9,959
Due after five years through ten years | ​ |  | 51,665 | ​ |  | 52,410 | ​ |  | 55,874 | ​ |  | 55,560
Due after ten years | ​ |  | 52,347 | ​ |  | 51,890 | ​ |  | 181,724 | ​ |  | 179,362
Total | ​ | $ | 104,811 | ​ | $ | 105,125 | ​ | $ | 250,501 | ​ | $ | 247,835

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