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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
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: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 21,798 | ​ | $ | 5 | ​ | $ | 3,625 | ​ | $ | 18,178
Mortgage-backed | ​ |  | 72,183 | ​ |  | 2 | ​ |  | 8,666 | ​ |  | 63,519
Otherd debt securities | ​ | ​ | 2,018 | ​ | ​ | — | ​ | ​ | 128 | ​ | ​ | 1,890
Total | ​ | $ | 95,999 | ​ | $ | 7 | ​ | $ | 12,419 | ​ | $ | 83,587
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 22,932 | ​ | $ | 7 | ​ | $ | 634 | ​ | $ | 22,305
Mortgage-backed | ​ |  | 91,948 | ​ |  | 1,318 | ​ |  | 629 | ​ |  | 92,637
Other debt securities | ​ |  | 2,026 | ​ |  | 14 | ​ |  | — | ​ |  | 2,040
Total | ​ | $ | 116,906 | ​ | $ | 1,339 | ​ | $ | 1,263 | ​ | $ | 116,982
​
Schedule of Held-to-Maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | Estimated
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
Held-to-maturity securities: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 148,097 | ​ | $ | — | ​ | $ | 13,601 | ​ | $ | 134,496
Mortgage-backed | ​ | ​ | 398,884 | ​ | ​ | — | ​ | ​ | 50,464 | ​ | ​ | 348,420
States and political subdivisions | ​ |  | 1,474 | ​ |  | 35 | ​ |  | 28 | ​ |  | 1,481
Other debt securities | ​ |  | 11,000 | ​ |  | — | ​ |  | 770 | ​ |  | 10,230
Total | ​ | $ | 559,455 | ​ | $ | 35 | ​ | $ | 64,863 | ​ | $ | 494,627
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 87,072 | ​ | $ | 20 | ​ | $ | 1,231 | ​ | $ | 85,861
Mortgage-backed | ​ | ​ | 302,604 | ​ | ​ | 301 | ​ | ​ | 2,248 | ​ | ​ | 300,657
States and political subdivisions | ​ |  | 400 | ​ |  | 2 | ​ |  | — | ​ |  | 402
Other debt securities | ​ |  | 14,518 | ​ |  | 95 | ​ |  | 9 | ​ |  | 14,604
Total | ​ | $ | 404,594 | ​ | $ | 418 | ​ | $ | 3,488 | ​ | $ | 401,524
​
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
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 1,165 | ​ | $ | 4 | ​ | $ | 16,585 | ​ | $ | 3,588 | ​ | $ | 17,750 | ​ | $ | 3,592
Mortgage-backed | ​ |  | 29,125 | ​ |  | 2,409 | ​ |  | 34,167 | ​ |  | 6,290 | ​ |  | 63,292 | ​ |  | 8,699
Other debt securities | ​ | ​ | 1,890 | ​ | ​ | 128 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,890 | ​ | ​ | 128
Total | ​ | $ | 32,180 | ​ | $ | 2,541 | ​ | $ | 50,752 | ​ | $ | 9,878 | ​ | $ | 82,932 | ​ | $ | 12,419
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 67,332 | ​ | $ | 2,786 | ​ | $ | 67,163 | ​ | $ | 10,815 | ​ | $ | 134,495 | ​ | $ | 13,601
Mortgage-backed | ​ | ​ | 148,771 | ​ | ​ | 9,402 | ​ | ​ | 199,649 | ​ | ​ | 41,062 | ​ | ​ | 348,420 | ​ | ​ | 50,464
States and political subdivisions | ​ | ​ | 780 | ​ | ​ | 28 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 780 | ​ | ​ | 28
Other debt securities | ​ | ​ | 8,091 | ​ | ​ | 409 | ​ | ​ | 2,139 | ​ | ​ | 361 | ​ | ​ | 10,230 | ​ | ​ | 770
Total | ​ | $ | 224,974 | ​ | $ | 12,625 | ​ | $ | 268,951 | ​ | $ | 52,238 | ​ | $ | 493,925 | ​ | $ | 64,863
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 1,561 | ​ | $ | 1 | ​ | $ | 17,368 | ​ | $ | 633 | ​ | $ | 18,929 | ​ | $ | 634
Mortgage-backed | ​ |  | 39,851 | ​ |  | 593 | ​ |  | 3,562 | ​ |  | 36 | ​ |  | 43,413 | ​ |  | 629
Total | ​ | $ | 41,412 | ​ | $ | 594 | ​ | $ | 20,930 | ​ | $ | 669 | ​ | $ | 62,342 | ​ | $ | 1,263
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 64,268 | ​ | $ | 1,005 | ​ | $ | 11,719 | ​ | $ | 226 | ​ | $ | 75,987 | ​ | $ | 1,231
Mortgage-backed | ​ | ​ | 226,918 | ​ | ​ | 1,836 | ​ | ​ | 14,564 | ​ | ​ | 412 | ​ | ​ | 241,482 | ​ | ​ | 2,248
Other debt securities | ​ |  | 491 | ​ |  | 9 | ​ |  | — | ​ |  | — | ​ |  | 491 | ​ |  | 9
Total | ​ | $ | 291,677 | ​ | $ | 2,850 | ​ | $ | 26,283 | ​ | $ | 638 | ​ | $ | 317,960 | ​ | $ | 3,488
​
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 | ​ | $ | 75 | ​ | $ | 74 | ​ | $ | 2,117 | ​ | $ | 2,076
Due after one year through five years | ​ |  | 6,658 | ​ |  | 6,351 | ​ |  | 108,632 | ​ |  | 101,165
Due after five years through ten years | ​ |  | 42,689 | ​ |  | 37,856 | ​ |  | 73,054 | ​ |  | 66,502
Due after ten years | ​ |  | 46,577 | ​ |  | 39,306 | ​ |  | 375,652 | ​ |  | 324,884
Total | ​ | $ | 95,999 | ​ | $ | 83,587 | ​ | $ | 559,455 | ​ | $ | 494,627
Amortized Cost and Estimated Fair Values of Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ |  | Amortized |  | ​ | ​ |  | Amortized |  | ​ | ​
(Dollars in thousands) | ​ | Cost | ​ | Fair Value | ​ | Cost | ​ | Fair Value
Pledged available-for-sale securities | ​ | $ | 83,288 | ​ | ​ | 72,108 | ​ | $ | 78,522 | ​ | $ | 78,352
Pledged held to maturity securities | ​ | ​ | 19,158 | ​ | ​ | 16,305 | ​ | ​ | 913 | ​ | ​ | 915
​

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