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Investment securities | 3 Months Ended
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Mar. 31, 2024
Investment securities |
Investment securities | 4. Investment securities: ​ The amortized cost and fair value of investment securities aggregated by investment category at March 31, 2024 and December 31, 2023 are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024 | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
Available for sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 198,006 | ​ | $ | ​ | ​ | $ | 14,107 | ​ | $ | 183,899 | ​
U.S. government-sponsored enterprises | ​ | ​ | 2,412 | ​ | ​ | ​ | ​ | ​ | 376 | ​ | ​ | 2,036 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ |  | 67,796 | ​ | ​ | ​ | ​ | ​ | 10,883 | ​ |  | 56,913 | ​
Tax-exempt | ​ |  | 75,542 | ​ |  | ​ | ​ | ​ | 8,983 | ​ |  | 66,559 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 702 | ​ |  | ​ | ​ | ​ | 37 | ​ |  | 665 | ​
U.S. government-sponsored enterprises | ​ |  | 88,488 | ​ |  | ​ | ​ |  | 18,989 | ​ |  | 69,499 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ |  | 11,435 | ​ |  | ​ | ​ |  | 336 | ​ |  | 11,099 | ​
Corporate debt securities | ​ | ​ | 4,000 | ​ | ​ | ​ | ​ | ​ | 257 | ​ | ​ | 3,743 | ​
Total available for sale | ​ | $ | 448,381 | ​ | $ | ​ | ​ | $ | 53,968 | ​ | $ | 394,413 | ​
Held to maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt state and municipals | ​ | $ | 11,192 | ​ | $ | 1 | ​ | $ | 709 | ​ | $ | 10,484 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 14,928 | ​ |  | ​ | ​ | ​ | 2,644 | ​ |  | 12,284 | ​
U.S. government-sponsored enterprises | ​ |  | 57,186 | ​ |  | ​ | ​ | ​ | 9,965 | ​ |  | 47,221 | ​
Total held to maturity | ​ | $ | 83,306 | ​ | $ | 1 | ​ | $ | 13,318 | ​ | $ | 69,989 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023 |
​ | ​ | ​ | ​ | ​ | Gross |  | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
Available for sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 197,920 | ​ | $ | ​ | ​ | $ | 13,863 | ​ | $ | 184,057 | ​
U.S. government-sponsored enterprises | ​ | ​ | 2,539 | ​ | ​ | ​ | ​ | ​ | 387 | ​ |  | 2,152 | ​
State and municipals: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ |  | 67,831 | ​ |  | ​ | ​ | ​ | 10,731 | ​ |  | 57,100 | ​
Tax-exempt | ​ |  | 75,742 | ​ |  | ​ | ​ |  | 8,618 | ​ |  | 67,124 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 758 | ​ |  | ​ | ​ |  | 34 | ​ |  | 724 | ​
U.S. government-sponsored enterprises | ​ |  | 89,935 | ​ |  | ​ | ​ |  | 17,264 | ​ |  | 72,671 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ | ​ | 11,729 | ​ | ​ | ​ | ​ | ​ | 360 | ​ | ​ | 11,369 | ​
Corporate debt securities | ​ | ​ | 4,000 | ​ | ​ | ​ | ​ | ​ | 270 | ​ | ​ | 3,730 | ​
Total available for sale | ​ | $ | 450,454 | ​ | $ | ​ | ​ | $ | 51,527 | ​ | $ | 398,927 | ​
Held to maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt state and municipals | ​ | $ | 11,201 | ​ | $ | 1 | ​ | $ | 660 | ​ | $ | 10,542 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | 15,400 | ​ |  | ​ | ​ | ​ | 2,653 | ​ |  | 12,747 | ​
U.S. government-sponsored enterprises | ​ |  | 58,250 | ​ |  | ​ | ​ | ​ | 9,841 | ​ |  | 48,409 | ​
Total held to maturity | ​ | $ | 84,851 | ​ | $ | 1 | ​ | $ | 13,154 | ​ | $ | 71,698 | ​
​ There were no investment sales during the three month period ended March 31, 2024. During the three month period ended March 31, 2023, investment securities, including U.S. Treasury bonds and mortgage-backed securities, with a par value of $65.6 million were sold at a net gain of $81 thousand. The proceeds were used to pay-down higher cost short-term borrowings. ​ The maturity distribution of the fair value, which is the net carrying amount, of the debt securities classified as available for sale at March 31, 2024, is summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized |  | Fair
(Dollars in thousands) |  | Cost |  | Value
Within one year | ​ | $ | 34,591 | ​ | $ | 33,607
After one but within five years | ​ |  | 183,827 | ​ |  | 169,269
After five but within ten years | ​ |  | 53,597 | ​ |  | 46,456
After ten years | ​ |  | 73,329 | ​ |  | 61,782
​ | ​ |  | 345,344 | ​ |  | 311,114
Mortgage-backed and other amortizing securities | ​ |  | 103,037 | ​ |  | 83,299
Total | ​ | $ | 448,381 | ​ | $ | 394,413
​ The maturity distribution of the amortized cost and fair value, of debt securities classified as held to maturity at March 31, 2024, is summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair
(Dollars in thousands) |  | Cost |  | Value
After one but within five years | ​ | $ | 1,194 | ​ | $ | 1,124
After five but within ten years | ​ | ​ | 9,998 | ​ | ​ | 9,360
​ | ​ |  | 11,192 | ​ |  | 10,484
Mortgage-backed securities | ​ |  | 72,114 | ​ |  | 59,505
Total | ​ | $ | 83,306 | ​ | $ | 69,989
​ Securities with a carrying value of $318.8 million and $322.4 million at March 31, 2024 and December 31, 2023, respectively, were pledged to secure public deposits and certain other deposits as required or permitted by law and pledged to the Discount Window at the Federal Reserve. ​ Securities and short-term investment activities are conducted with a diverse group of government entities, corporations and state and local municipalities. The counterparty’s creditworthiness and type of collateral is evaluated on a case-by-case basis. At March 31, 2024, there were no significant concentrations of credit risk from any one issuer, with the exception of U.S. government agencies and sponsored enterprises, which exceeded 10.0 percent of stockholders’ equity. The fair value and gross unrealized losses of investment securities with unrealized losses at March 31, 2024 and December 31, 2023, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
​ | ​ | Less than Twelve Months | ​ | Twelve Months or Longer | ​ | Total
​ | ​ | Total # in a loss | ​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Total # in a loss | ​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Total # in a loss | ​ | ​ | ​ | ​ | ​ | Unrealized
(Dollars in thousands) | ​ | Position | ​ | ​ | Fair Value | ​ | ​ | Losses | ​ | Position | ​ | ​ | Fair Value | ​ | ​ | Losses | ​ | Position | ​ | ​ | Fair Value | ​ | ​ | Losses
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 43 | ​ | $ | 183,899 | ​ | $ | 14,107 | ​ | 43 | ​ | $ | 183,899 | ​ | $ | 14,107
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2 | ​ | ​ | 2,036 | ​ | ​ | 376 | ​ | 2 | ​ | ​ | 2,036 | ​ | ​ | 376
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 66 | ​ | ​ | 56,913 | ​ | ​ | 10,883 | ​ | 66 | ​ | ​ | 56,913 | ​ | ​ | 10,883
Tax-exempt | ​ | 2 | ​ | $ | 578 | ​ | $ | 2 | ​ | 93 | ​ | ​ | 65,825 | ​ | ​ | 8,981 | ​ | 95 | ​ | ​ | 66,403 | ​ | ​ | 8,983
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 3 | ​ | ​ | 665 | ​ | ​ | 37 | ​ | 3 | ​ | ​ | 665 | ​ | ​ | 37
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 31 | ​ | ​ | 69,499 | ​ | ​ | 18,989 | ​ | 31 | ​ | ​ | 69,499 | ​ | ​ | 18,989
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 4 | ​ | ​ | 11,099 | ​ | ​ | 336 | ​ | 4 | ​ | ​ | 11,099 | ​ | ​ | 336
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 6 | ​ | ​ | 3,743 | ​ | ​ | 257 | ​ | 6 | ​ | ​ | 3,743 | ​ | ​ | 257
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | 2 | ​ | $ | 578 | ​ | $ | 2 | ​ | 248 | ​ | $ | 393,679 | ​ | $ | 53,966 | ​ | 250 | ​ | $ | 394,257 | ​ | $ | 53,968
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt | ​ | 2 | ​ | $ | 1,168 | ​ | $ | 17 | ​ | 11 | ​ | $ | 6,630 | ​ | $ | 692 | ​ | 13 | ​ | $ | 7,798 | ​ | $ | 709
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 4 | ​ | ​ | 12,284 | ​ | ​ | 2,644 | ​ | 4 | ​ | ​ | 12,284 | ​ | ​ | 2,644
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 8 | ​ | ​ | 47,221 | ​ | ​ | 9,965 | ​ | 8 | ​ | ​ | 47,221 | ​ | ​ | 9,965
Total | ​ | 2 | ​ | $ | 1,168 | ​ | $ | 17 | ​ | 23 | ​ | $ | 66,135 | ​ | $ | 13,301 | ​ | 25 | ​ | $ | 67,303 | ​ | $ | 13,318
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Less than Twelve Months | ​ | Twelve Months or Longer | ​ | Total
​ | ​ | Total # in a loss | ​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Total # in a loss | ​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Total # in a loss | ​ | ​ | ​ | ​ | ​ | Unrealized
(Dollars in thousands) | ​ | Position | ​ | ​ | Fair Value | ​ | ​ | Losses | ​ | Position | ​ | ​ | Fair Value | ​ | ​ | Losses | ​ | Position | ​ | ​ | Fair Value | ​ | ​ | Losses
Securities Available for Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 43 | ​ | $ | 184,057 | ​ | $ | 13,863 | ​ | 43 | ​ | $ | 184,057 | ​ | $ | 13,863
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2 | ​ | ​ | 2,152 | ​ | ​ | 387 | ​ | 2 | ​ | ​ | 2,152 | ​ | ​ | 387
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ | 1 | ​ | ​ | 995 | ​ | ​ | 6 | ​ | 65 | ​ | ​ | 56,105 | ​ | ​ | 10,725 | ​ | 66 | ​ | ​ | 57,100 | ​ | ​ | 10,731
Tax-exempt | ​ | 2 | ​ | ​ | 575 | ​ | ​ | 5 | ​ | 93 | ​ | ​ | 66,393 | ​ | ​ | 8,613 | ​ | 95 | ​ | ​ | 66,968 | ​ | ​ | 8,618
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 3 | ​ | ​ | 724 | ​ | ​ | 34 | ​ | 3 | ​ | ​ | 724 | ​ | ​ | 34
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 32 | ​ | ​ | 72,671 | ​ | ​ | 17,264 | ​ | 32 | ​ | ​ | 72,671 | ​ | ​ | 17,264
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 4 | ​ | ​ | 11,369 | ​ | ​ | 360 | ​ | 4 | ​ | ​ | 11,369 | ​ | ​ | 360
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 6 | ​ | ​ | 3,730 | ​ | ​ | 270 | ​ | 6 | ​ | ​ | 3,730 | ​ | ​ | 270
Total | ​ | 3 | ​ | ​ | 1,570 | ​ | ​ | 11 | ​ | 248 | ​ | ​ | 397,201 | ​ | ​ | 51,516 | ​ | 251 | ​ | ​ | 398,771 | ​ | ​ | 51,527
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities Held to Maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt | ​ | 2 | ​ | $ | 1,438 | ​ | $ | 36 | ​ | 10 | ​ | $ | 6,209 | ​ | $ | 624 | ​ | 12 | ​ | $ | 7,647 | ​ | $ | 660
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 4 | ​ | ​ | 12,747 | ​ | ​ | 2,653 | ​ | 4 | ​ | ​ | 12,747 | ​ | ​ | 2,653
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 8 | ​ | ​ | 48,409 | ​ | ​ | 9,841 | ​ | 8 | ​ | ​ | 48,409 | ​ | ​ | 9,841
Total | ​ | 2 | ​ | $ | 1,438 | ​ | $ | 36 | ​ | 22 | ​ | $ | 67,365 | ​ | $ | 13,118 | ​ | 24 | ​ | $ | 68,803 | ​ | $ | 13,154
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ ​ Management considered whether a credit loss existed related to the investments in an unrealized loss position by determining (i) whether the decline in fair value is attributable to adverse conditions specifically related to the financial condition of the security issuer or specific conditions in an industry or geographic area; (ii) whether the credit rating of the issuer of the security has been downgraded; (iii) whether dividend or interest payments have been reduced or have not been made and (iv) an adverse change in the remaining expected cash flows from the security such that the Company will not recover the amortized cost of the security. If the decline is judged to be due to factors related to credit, the credit loss should be recorded as an ACL with an offsetting entry to net income. The portion of the loss related to non-credit factors are recorded in OCI. ​ Based on management’s assessment of the factors identified above, it is determined the fair value of all the identified investments being less than the amortized costs is primarily caused by the rapid increase in market rates and not credit quality. All interest payments have been received as scheduled, substantially all debt securities are rated above investment grade and no material downgrades announced. Because the Company does not intend to sell the investments and it is not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Company does not consider the unrealized loss to be credit related, thus no allowance for credit loss expense was recorded at March 31, 2024 or December 31, 2023. ​ Cost method investments consist primarily of Federal Home Loan Bank (“FHLB”) of Pittsburgh stock totaling $5.0 million and $5.2 million at March 31, 2024 and December 31, 2023, respectively, and are included in other assets in the Consolidated Balance Sheets. Cost method investments are evaluated for impairment whenever events or circumstances suggest that their carrying value may not be recoverable. ​

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