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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 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: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 18,583 | ​ | $ | 4 | ​ | $ | 438 | ​ | $ | 18,149
Mortgage-backed | ​ |  | 104,492 | ​ |  | 2,031 | ​ |  | 569 | ​ |  | 105,954
Total | ​ | $ | 123,075 | ​ | $ | 2,035 | ​ | $ | 1,007 | ​ | $ | 124,103
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 38,409 | ​ | $ | 12 | ​ | $ | 423 | ​ | $ | 37,998
Mortgage-backed | ​ | ​ | 68,067 | ​ | ​ | 74 | ​ | ​ | 700 | ​ | ​ | 67,441
States and political subdivisions | ​ |  | 400 | ​ |  | 1 | ​ |  | — | ​ |  | 401
Other debt securities | ​ |  | 19,053 | ​ |  | 226 | ​ |  | 43 | ​ |  | 19,236
Total | ​ | $ | 125,929 | ​ | $ | 313 | ​ | $ | 1,166 | ​ | $ | 125,076
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 17,564 | ​ | $ | 436 | ​ | $ | 223 | ​ | $ | 2 | ​ | $ | 17,787 | ​ | $ | 438
Mortgage-backed | ​ |  | 49,427 | ​ |  | 569 | ​ |  | — | ​ |  | — | ​ |  | 49,427 | ​ |  | 569
Total | ​ | $ | 66,991 | ​ | $ | 1,005 | ​ | $ | 223 | ​ | $ | 2 | ​ | $ | 67,214 | ​ | $ | 1,007
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 22,082 | ​ | $ | 423 | ​ | $ | — | ​ | $ | — | ​ | $ | 22,082 | ​ | $ | 423
Mortgage-backed | ​ | ​ | 49,863 | ​ | ​ | 700 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 49,863 | ​ | ​ | 700
Other debt securities | ​ | ​ | 4,457 | ​ | ​ | 43 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,457 | ​ | ​ | 43
Total | ​ | $ | 76,402 | ​ | $ | 1,166 | ​ | $ | — | ​ | $ | — | ​ | $ | 76,402 | ​ | $ | 1,166
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ |  | 1,174 | ​ |  | 1,214 | ​ |  | 7,919 | ​ |  | 7,968
Due after five years through ten years | ​ |  | 57,863 | ​ |  | 59,015 | ​ |  | 37,492 | ​ |  | 37,403
Due after ten years | ​ |  | 64,038 | ​ |  | 63,874 | ​ |  | 80,518 | ​ |  | 79,705
Total | ​ | $ | 123,075 | ​ | $ | 124,103 | ​ | $ | 125,929 | ​ | $ | 125,076

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