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Investment Securities (Tables) | 3 Months Ended
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Mar. 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: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 22,495 | ​ | $ | 5 | ​ | $ | 1,245 | ​ | $ | 21,255
Mortgage-backed | ​ |  | 85,165 | ​ |  | 381 | ​ |  | 2,104 | ​ |  | 83,442
Other Debt securities | ​ | ​ | 2,024 | ​ | ​ | — | ​ | ​ | 26 | ​ | ​ | 1,998
Total | ​ | $ | 109,684 | ​ | $ | 386 | ​ | $ | 3,375 | ​ | $ | 106,695
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
March 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 86,490 | ​ | $ | — | ​ | $ | 3,472 | ​ | $ | 83,018
Mortgage-backed | ​ | ​ | 305,741 | ​ | ​ | 1 | ​ | ​ | 13,116 | ​ | ​ | 292,626
States and political subdivisions | ​ |  | 400 | ​ |  | 1 | ​ |  | — | ​ |  | 401
Other debt securities | ​ |  | 14,507 | ​ |  | 45 | ​ |  | 56 | ​ |  | 14,496
Total | ​ | $ | 407,138 | ​ | $ | 47 | ​ | $ | 16,644 | ​ | $ | 390,541
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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
March 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 1,561 | ​ | $ | 65 | ​ | $ | 17,368 | ​ | $ | 1,180 | ​ | $ | 18,929 | ​ | $ | 1,245
Mortgage-backed | ​ |  | 39,851 | ​ |  | 490 | ​ |  | 3,562 | ​ |  | 1,614 | ​ |  | 43,413 | ​ |  | 2,104
Other debt securities | ​ | ​ | 1,998 | ​ | ​ | 26 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,998 | ​ | ​ | 26
Total | ​ | $ | 43,410 | ​ | $ | 581 | ​ | $ | 20,930 | ​ | $ | 2,794 | ​ | $ | 64,340 | ​ | $ | 3,375
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 62,586 | ​ | $ | 2,157 | ​ | $ | 20,432 | ​ | $ | 1,315 | ​ | $ | 83,018 | ​ | $ | 3,472
Mortgage-backed | ​ | ​ | 253,725 | ​ | ​ | 10,536 | ​ | ​ | 36,962 | ​ | ​ | 2,580 | ​ | ​ | 290,687 | ​ | ​ | 13,116
Other debt securities | ​ | ​ | 4,943 | ​ | ​ | 56 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,943 | ​ | ​ | 56
Total | ​ | $ | 321,254 | ​ | $ | 12,749 | ​ | $ | 57,394 | ​ | $ | 3,895 | ​ | $ | 378,648 | ​ | $ | 16,644
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | $ | 71 | ​ | $ | 72 | ​ | $ | 3,924 | ​ | $ | 3,930
Due after one year through five years | ​ |  | 2,137 | ​ |  | 2,149 | ​ |  | 22,537 | ​ |  | 22,016
Due after five years through ten years | ​ |  | 55,374 | ​ |  | 54,351 | ​ |  | 91,202 | ​ |  | 88,810
Due after ten years | ​ |  | 52,102 | ​ |  | 50,123 | ​ |  | 289,475 | ​ |  | 275,785
Total | ​ | $ | 109,684 | ​ | $ | 106,695 | ​ | $ | 407,138 | ​ | $ | 390,541

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