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Investment securities (Tables) | 6 Months Ended
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Jun. 30, 2023
Investment Securities |
Schedule of amortized cost and fair value of investment securities aggregated by investment category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2023 | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
Available for sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 197,746 | ​ | $ | ​ | ​ | $ | 18,642 | ​ | $ | 179,104 | ​
U.S. government-sponsored enterprises | ​ | ​ | 2,605 | ​ | ​ | ​ | ​ | ​ | 404 | ​ | ​ | 2,201 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ |  | 68,391 | ​ | ​ | ​ | ​ | ​ | 12,029 | ​ |  | 56,362 | ​
Tax-exempt | ​ |  | 76,683 | ​ |  | ​ | ​ | ​ | 9,819 | ​ |  | 66,864 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 897 | ​ |  | ​ | ​ | ​ | 48 | ​ |  | 849 | ​
U.S. government-sponsored enterprises | ​ |  | 94,065 | ​ |  | ​ | ​ |  | 18,692 | ​ |  | 75,373 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ |  | 12,082 | ​ |  | ​ | ​ |  | 584 | ​ |  | 11,498 | ​
Corporate debt securities | ​ | ​ | 4,000 | ​ | ​ | ​ | ​ | ​ | 425 | ​ | ​ | 3,575 | ​
Total | ​ | $ | 456,469 | ​ | $ | ​ | ​ | $ | 60,643 | ​ | $ | 395,826 | ​
Held to maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt state and municipals | ​ | $ | 11,219 | ​ | $ | 1 | ​ | $ | 788 | ​ | $ | 10,432 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 16,360 | ​ |  | ​ | ​ | ​ | 2,859 | ​ |  | 13,501 | ​
U.S. government-sponsored enterprises | ​ |  | 60,632 | ​ |  | ​ | ​ | ​ | 10,552 | ​ |  | 50,080 | ​
Total | ​ | $ | 88,211 | ​ | $ | 1 | ​ | $ | 14,199 | ​ | $ | 74,013 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022 |
​ | ​ | ​ | ​ | ​ | Gross |  | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |
Available for sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 199,937 | ​ | $ | ​ | ​ | $ | 19,640 | ​ | $ | 180,297 | ​
U.S. government-sponsored enterprises | ​ | ​ | 16,955 | ​ | ​ | ​ | ​ | ​ | 585 | ​ |  | 16,370 | ​
State and municipals: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ |  | 68,946 | ​ |  | ​ | ​ | ​ | 13,588 | ​ |  | 55,358 | ​
Tax-exempt | ​ |  | 99,774 | ​ |  | 93 | ​ |  | 11,460 | ​ |  | 88,407 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 982 | ​ |  | ​ | ​ |  | 40 | ​ |  | 942 | ​
U.S. government-sponsored enterprises | ​ |  | 141,231 | ​ |  | ​ | ​ |  | 20,112 | ​ |  | 121,119 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ | ​ | 12,128 | ​ | ​ | ​ | ​ | ​ | 544 | ​ | ​ | 11,584 | ​
Corporate debt securities | ​ | ​ | 4,000 | ​ | ​ | ​ | ​ | ​ | 374 | ​ | ​ | 3,626 | ​
Total | ​ | $ | 543,953 | ​ | $ | 93 | ​ | $ | 66,343 | ​ | $ | 477,703 | ​
Held to maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt state and municipals | ​ | $ | 11,237 | ​ | $ | 1 | ​ | $ | 841 | ​ | $ | 10,397 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | 17,304 | ​ |  | ​ | ​ | ​ | 3,016 | ​ |  | 14,288 | ​
U.S. government-sponsored enterprises | ​ |  | 62,638 | ​ |  | ​ | ​ | ​ | 10,760 | ​ |  | 51,878 | ​
Total | ​ | $ | 91,179 | ​ | $ | 1 | ​ | $ | 14,617 | ​ | $ | 76,563 | ​
Schedule of fair value and unrealized losses of investment securities in continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2023 | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or Greater | ​ | Total | ​
​ | ​ | Number of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Number of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Number of | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Securities in a | ​ | Fair | ​ | Unrealized | ​ | Securities in a | ​ | Fair | ​ | Unrealized | ​ | Securities in a | ​ | Fair | ​ | Unrealized | ​
(Dollars in thousands) |  | Loss Position |  | Value |  | Losses |  | Loss Position |  | Value |  | Losses |  | Loss Position |  | Value |  | Losses | ​
U.S. Treasury securities | ​ | ​ | ​ | $ | ​ | ​ | $ | ​ | ​ | 43 | ​ | $ | 179,104 | ​ | $ | 18,642 | ​ | 43 | ​ | $ | 179,104 | ​ | $ | 18,642 | ​
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2 | ​ | ​ | 2,201 | ​ | ​ | 404 | ​ | 2 | ​ | ​ | 2,201 | ​ | ​ | 404 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ | 3 | ​ | ​ | 1,984 | ​ | ​ | 24 | ​ | 64 | ​ | ​ | 54,378 | ​ | ​ | 12,005 | ​ | 67 | ​ | ​ | 56,362 | ​ | ​ | 12,029 | ​
Tax-exempt | ​ | 11 | ​ | ​ | 4,217 | ​ | ​ | 75 | ​ | 100 | ​ | ​ | 70,868 | ​ | ​ | 10,532 | ​ | 111 | ​ | ​ | 75,085 | ​ | ​ | 10,607 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 8 | ​ | ​ | 14,350 | ​ | ​ | 2,907 | ​ | 8 | ​ | ​ | 14,350 | ​ | ​ | 2,907 | ​
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 41 | ​ | ​ | 125,453 | ​ | ​ | 29,244 | ​ | 41 | ​ | ​ | 125,453 | ​ |  | 29,244 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 4 | ​ | ​ | 11,498 | ​ | ​ | 584 | ​ | 4 | ​ |  | 11,498 | ​ |  | 584 | ​
Corporate debt securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 6 | ​ | ​ | 3,575 | ​ | ​ | 425 | ​ | 6 | ​ | ​ | 3,575 | ​ | ​ | 425 | ​
Total | ​ | 14 | ​ | $ | 6,201 | ​ | $ | 99 | ​ | 268 | ​ | $ | 461,427 | ​ | $ | 74,743 | ​ | 282 | ​ | $ | 467,628 | ​ | $ | 74,842 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or Greater | ​ | Total | ​
​ | ​ | Number of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Number of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Number of | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Securities in a | ​ | Fair | ​ | Unrealized | ​ | Securities in a | ​ | Fair | ​ | Unrealized | ​ | Securities in a | ​ | Fair | ​ | Unrealized | ​
(Dollars in thousands) |  | Loss Position |  | Value |  | Losses |  | Loss Position |  | Value |  | Losses |  | Loss Position |  | Value |  | Losses | ​
U.S. Treasury securities | ​ | 5 | ​ | $ | 23,700 | ​ | $ | 1,887 | ​ | 40 | ​ | $ | 156,597 | ​ | $ | 17,753 | ​ | 45 | ​ | $ | 180,297 | ​ | $ | 19,640 | ​
U.S. government-sponsored enterprises | ​ | 4 | ​ | ​ | 14,104 | ​ | ​ | 197 | ​ | 1 | ​ | ​ | 2,266 | ​ | ​ | 388 | ​ | 5 | ​ | ​ | 16,370 | ​ | ​ | 585 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ | 21 | ​ | ​ | 19,919 | ​ | ​ | 2,908 | ​ | 45 | ​ | ​ | 34,464 | ​ | ​ | 10,680 | ​ | 66 | ​ | ​ | 54,383 | ​ | ​ | 13,588 | ​
Tax-exempt | ​ | 39 | ​ |  | 30,973 | ​ |  | 1,690 | ​ | 84 | ​ | ​ | 59,664 | ​ |  | 10,611 | ​ | 123 | ​ |  | 90,637 | ​ |  | 12,301 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | 5 | ​ | ​ | 904 | ​ |  | 39 | ​ | 4 | ​ | ​ | 14,326 | ​ | ​ | 3,017 | ​ | 9 | ​ |  | 15,230 | ​ |  | 3,056 | ​
U.S. government-sponsored enterprises | ​ | 19 | ​ |  | 57,166 | ​ |  | 2,029 | ​ | 25 | ​ | ​ | 115,831 | ​ | ​ | 28,843 | ​ | 44 | ​ |  | 172,997 | ​ |  | 30,872 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ | 4 | ​ | ​ | 11,584 | ​ | ​ | 544 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 4 | ​ |  | 11,584 | ​ |  | 544 | ​
Corporate debt securities | ​ | 1 | ​ |  | 953 | ​ |  | 47 | ​ | 5 | ​ | ​ | 2,673 | ​ | ​ | 327 | ​ | 6 | ​ |  | 3,626 | ​ |  | 374 | ​
Total | ​ | 98 | ​ | $ | 159,303 | ​ | $ | 9,341 | ​ | 204 | ​ | $ | 385,821 | ​ | $ | 71,619 | ​ | 302 | ​ | $ | 545,124 | ​ | $ | 80,960 | ​
Available-for-Sale Securities |
Investment Securities |
Schedule of maturity distribution of fair value | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Fair |
(Dollars in thousands) |  | Value |
Within one year | ​ | $ | 6,311 | ​
After one but within five years | ​ |  | 176,620 | ​
After five but within ten years | ​ |  | 57,527 | ​
After ten years | ​ |  | 65,447 | ​
​ | ​ |  | 305,905 | ​
Mortgage-backed and other amortizing securities | ​ |  | 89,921 | ​
Total | ​ | $ | 395,826 | ​
Held-to-maturity Securities. |
Investment Securities |
Schedule of maturity distribution of fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair |
(Dollars in thousands) |  | Cost |  | Value |
After five but within ten years | ​ | $ | 8,869 | ​ | $ | 8,263 | ​
After ten years | ​ | ​ | 2,350 | ​ | ​ | 2,169 | ​
​ | ​ |  | 11,219 | ​ |  | 10,432 | ​
Mortgage-backed securities | ​ |  | 76,992 | ​ |  | 63,581 | ​
Total | ​ | $ | 88,211 | ​ | $ | 74,013 | ​

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