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Investments Securities | 12 Months Ended
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Dec. 31, 2023
Investments [Abstract] |
Investments | ​ ​ 4. Investment Securities The following table shows a comparison of amortized cost and fair values of investment securities at December 31, 2023 and 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Estimated Fair Value
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | $ | 7,000 | ​ | $ | — | ​ | $ | 966 | ​ | $ | — | ​ | $ | 6,034
Residential mortgage-backed agencies | ​ | ​ | 24,781 | ​ | ​ | — | ​ | ​ | 4,218 | ​ | ​ | — | ​ | ​ | 20,563
Commercial mortgage-backed agencies | ​ | ​ | 36,258 | ​ | ​ | — | ​ | ​ | 7,841 | ​ | ​ | — | ​ | ​ | 28,417
Collateralized mortgage obligations | ​ | ​ | 19,725 | ​ | ​ | — | ​ | ​ | 3,369 | ​ | ​ | — | ​ | ​ | 16,356
Obligations of states and political subdivisions | ​ | ​ | 10,486 | ​ | ​ | 15 | ​ | ​ | 189 | ​ | ​ | — | ​ | ​ | 10,312
Corporate Bonds | ​ | ​ | 1,000 | ​ | ​ | — | ​ | ​ | 222 | ​ | ​ | — | ​ | ​ | 778
Collateralized debt obligations | ​ | ​ | 18,671 | ​ | ​ | — | ​ | ​ | 3,962 | ​ | ​ | — | ​ | ​ | 14,709
Total available for sale | ​ | $ | 117,921 | ​ | $ | 15 | ​ | $ | 20,767 | ​ | $ | — | ​ | $ | 97,169
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gross Unrecognized Gains |  | Gross Unrecognized Losses |  | Estimated Fair Value |  | Allowance for Credit Losses
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 37,462 | ​ | $ | — | ​ | $ | 243 | ​ | $ | 37,219 | ​ | $ | —
U.S. government agencies | ​ | ​ | 68,014 | ​ | ​ | — | ​ | ​ | 10,985 | ​ | ​ | 57,029 | ​ | ​ | —
Residential mortgage-backed agencies | ​ | ​ | 29,588 | ​ | ​ | 42 | ​ | ​ | 2,913 | ​ | ​ | 26,717 | ​ | ​ | —
Commercial mortgage-backed agencies | ​ | ​ | 21,413 | ​ | ​ | — | ​ | ​ | 5,361 | ​ | ​ | 16,052 | ​ | ​ | —
Collateralized mortgage obligations | ​ | ​ | 53,261 | ​ | ​ | — | ​ | ​ | 9,973 | ​ | ​ | 43,288 | ​ | ​ | —
Obligations of states and political subdivisions | ​ | ​ | 4,604 | ​ | ​ | 177 | ​ | ​ | 671 | ​ | ​ | 4,110 | ​ | ​ | 45
Total held to maturity | ​ | $ | 214,342 | ​ | $ | 219 | ​ | $ | 30,146 | ​ | $ | 184,415 | ​ | $ | 45
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | $ | 11,044 | ​ | $ | — | ​ | $ | 1,582 | ​ | $ | 9,462
Residential mortgage-backed agencies |  | ​ | 45,052 | ​ | ​ | — | ​ | ​ | 7,651 | ​ | ​ | 37,401
Commercial mortgage-backed agencies | ​ | ​ | 37,393 | ​ | ​ | — | ​ | ​ | 6,661 | ​ | ​ | 30,732
Collateralized mortgage obligations | ​ | ​ | 25,828 | ​ | ​ | — | ​ | ​ | 4,784 | ​ | ​ | 21,044
Obligations of states and political subdivisions | ​ | ​ | 10,848 | ​ | ​ | 4 | ​ | ​ | 360 | ​ | ​ | 10,492
Corporate Bonds | ​ | ​ | 1,000 | ​ | ​ | — | ​ | ​ | 113 | ​ | ​ | 887
Collateralized debt obligations | ​ | ​ | 18,664 | ​ | ​ | — | ​ | ​ | 2,793 | ​ | ​ | 15,871
Total available for sale | ​ | $ | 149,829 | ​ | $ | 4 | ​ | $ | 23,944 | ​ | $ | 125,889
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gross Unrecognized Gains |  | Gross Unrecognized Losses |  | Estimated Fair Value
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | 37,204 | ​ | $ | — | ​ | $ | 1,593 | ​ | $ | 35,611
U.S. government agencies | ​ | ​ | 67,734 | ​ | ​ | — | ​ | ​ | 13,261 | ​ | ​ | 54,473
Residential mortgage-backed agencies | ​ | ​ | 28,624 | ​ | ​ | 1 | ​ | ​ | 3,503 | ​ | ​ | 25,122
Commercial mortgage-backed agencies | ​ | ​ | 22,389 | ​ | ​ | — | ​ | ​ | 4,568 | ​ | ​ | 17,821
Collateralized mortgage obligations | ​ | ​ | 57,085 | ​ | ​ | — | ​ | ​ | 10,001 | ​ | ​ | 47,084
Obligations of states and political subdivisions | ​ | ​ | 22,623 | ​ | ​ | 946 | ​ | ​ | 600 | ​ | ​ | 22,969
Total held to maturity | ​ | $ | 235,659 | ​ | $ | 947 | ​ | $ | 33,526 | ​ | $ | 203,080
​ Proceeds from sales and calls of available-for-sale securities and the realized gains and losses for the years ended December 31, 2023 and 2022 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2023 |  | 2022
Proceeds | ​ | $ | 20,249 | ​ | $ | 1,023
Gross realized gains | ​ | ​ | — | ​ | ​ | 3
Gross realized losses | ​ | ​ | 4,214 | ​ | ​ | —
​ ​ The following table shows the Corporation’s securities with gross unrealized and unrecognized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized position, at December 31, 2023 and 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more
(in thousands) |  | Fair Value |  | Unrealized Losses |  | Number of Investments |  | Fair Value |  | Unrealized Losses |  | Number of Investments
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 6,034 | ​ | $ | 966 | ​ | 2
Residential mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 20,563 | ​ | ​ | 4,218 | ​ | 3
Commercial mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 28,417 | ​ | ​ | 7,841 | ​ | 8
Collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 16,356 | ​ | ​ | 3,369 | ​ | 9
Obligations of states and political subdivisions | ​ | ​ | 1,445 | ​ | ​ | 20 | ​ | 2 | ​ | ​ | 6,668 | ​ | ​ | 169 | ​ | 3
Corporate Bonds | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 778 | ​ | ​ | 222 | ​ | 1
Collateralized debt obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 14,709 | ​ | ​ | 3,962 | ​ | 9
Total available for sale | ​ | $ | 1,445 | ​ | $ | 20 | ​ | 2 | ​ | $ | 93,525 | ​ | $ | 20,747 | ​ | 35
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more
(in thousands) |  | Fair Value |  | Unrecognized Losses |  | Number of Investments |  | Fair Value |  | Unrecognized Losses |  | Number of Investments
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 37,219 | ​ | $ | 243 | ​ | 4
U.S. government agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 57,029 | ​ | ​ | 10,985 | ​ | 9
Residential mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 22,613 | ​ | ​ | 2,913 | ​ | 35
Commercial mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 16,052 | ​ | ​ | 5,361 | ​ | 2
Collateralized mortgage obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 43,288 | ​ | ​ | 9,973 | ​ | 8
Obligations of states and political subdivisions | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 2,205 | ​ | ​ | 671 | ​ | 1
Total held to maturity | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 178,406 | ​ | $ | 30,146 | ​ | 59
​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more
(in thousands) |  | Fair Value |  | Unrealized Losses |  | Number of Investments |  | Fair Value |  | Unrealized Losses |  | Number of Investments
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available for Sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | $ | 4,598 | ​ | $ | 402 | ​ | 1 | ​ | $ | 4,865 | ​ | $ | 1,180 | ​ | 2
Residential mortgage-backed agencies | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 37,401 | ​ | ​ | 7,651 | ​ | 5
Commercial mortgage-backed agencies | ​ | ​ | 4,044 | ​ | ​ | 455 | ​ | 3 | ​ | ​ | 26,688 | ​ | ​ | 6,206 | ​ | 6
Collateralized mortgage obligations | ​ | ​ | 1,600 | ​ | ​ | 210 | ​ | 5 | ​ | ​ | 19,444 | ​ | ​ | 4,574 | ​ | 5
Obligations of states and political subdivisions | ​ | ​ | 8,906 | ​ | ​ | 360 | ​ | 7 | ​ | ​ | — | ​ | ​ | — | ​ | —
Corporate Bonds | ​ | ​ | 887 | ​ | ​ | 113 | ​ | 1 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Collateralized debt obligations | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 15,871 | ​ | ​ | 2,793 | ​ | 9
Total available for sale | ​ | $ | 20,035 | ​ | $ | 1,540 | ​ | 17 | ​ | $ | 104,269 | ​ | $ | 22,404 | ​ | 27
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more
(in thousands) |  | Fair Value |  | Unrecognized Losses |  | Number of Investments |  | Fair Value |  | Unrecognized Losses |  | Number of Investments
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 35,611 | ​ | $ | 1,593 | ​ | 4
U.S. government agencies | ​ | ​ | 38,883 | ​ | ​ | 9,617 | ​ | 7 | ​ | ​ | 15,591 | ​ | ​ | 3,644 | ​ | 2
Residential mortgage-backed agencies | ​ | ​ | 16,893 | ​ | ​ | 1,425 | ​ | 29 | ​ | ​ | 8,138 | ​ | ​ | 2,078 | ​ | 7
Commercial mortgage-backed agencies | ​ | ​ | 17,821 | ​ | ​ | 4,568 | ​ | 3 | ​ | ​ | — | ​ | ​ | — | ​ | —
Collateralized mortgage obligations | ​ | ​ | 47,083 | ​ | ​ | 10,001 | ​ | 8 | ​ | ​ | — | ​ | ​ | — | ​ | —
Obligations of states and political subdivisions | ​ | ​ | 2,269 | ​ | ​ | 600 | ​ | 1 | ​ | ​ | — | ​ | ​ | — | ​ | —
Total held to maturity | ​ | $ | 122,949 | ​ | $ | 26,211 | ​ | 48 | ​ | $ | 59,340 | ​ | $ | 7,315 | ​ | 13
​ ​ As of December 31, 2023, the Corporation recorded ACL of approximately $45,000 related to one bond in the HTM security portfolio. There was no ACL related to its AFS or HTM security portfolio at December 31, 2022. ​ ​ The amortized cost and estimated fair value of securities by contractual maturity at December 31, 2023 are shown in the following table. Actual maturities will differ from contractual maturities because the issuers of the securities may have the right to call or prepay obligations with or without call or prepayment penalties. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Fair Value
Contractual Maturity | ​ | ​ | ​ | ​ | ​ | ​
Available for sale: | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 2,670 | ​ | $ | 2,640
Due after one year through five years | ​ | ​ | 5,250 | ​ | ​ | 4,952
Due after five years through ten years | ​ | ​ | 2,410 | ​ | ​ | 2,168
Due after ten years | ​ | ​ | 26,827 | ​ | ​ | 22,073
​ | ​ | ​ | 37,157 | ​ | ​ | 31,833
Residential mortgage-backed agencies | ​ | ​ | 24,781 | ​ | ​ | 20,563
Commercial mortgage-backed agencies | ​ | ​ | 36,258 | ​ | ​ | 28,417
Collateralized mortgage obligations | ​ | ​ | 19,725 | ​ | ​ | 16,356
Total available for sale | ​ | $ | 117,921 | ​ | $ | 97,169
Held to Maturity: | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 37,462 | ​ | $ | 37,219
Due after one year through five years | ​ | ​ | 12,500 | ​ | ​ | 11,706
Due after five years through ten years | ​ | ​ | 40,456 | ​ | ​ | 34,495
Due after ten years | ​ | ​ | 19,662 | ​ | ​ | 14,938
​ | ​ | ​ | 110,080 | ​ | ​ | 98,358
Residential mortgage-backed agencies | ​ | ​ | 29,588 | ​ | ​ | 26,717
Commercial mortgage-backed agencies | ​ | ​ | 21,413 | ​ | ​ | 16,052
Collateralized mortgage obligations | ​ | ​ | 53,261 | ​ | ​ | 43,288
Total held to maturity | ​ | $ | 214,342 | ​ | $ | 184,415
​ At December 31, 2023 and 2022, AFS investment securities with a fair value of $50.5 million and $49.7 million, respectively, and HTM investment securities with a book value of $141.8 million and $165.9 million were pledged as permitted or required to secure public deposits, for securities sold under agreements to repurchase as required or permitted by law and as collateral for borrowing capacity.

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