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Investment securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Investment Securities |
Schedule of amortized cost and fair value of investment securities aggregated by investment category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
June 30, 2021 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 16,483 | ​ | $ | 260 | ​ | ​ | ​ | ​ | $ | 16,743 | ​
U.S. government-sponsored enterprises | ​ | ​ | 56,591 | ​ | ​ | 868 | ​ | ​ | ​ | ​ | ​ | 57,459 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ |  | 59,423 | ​ | ​ | 1,544 | ​ | $ | 514 | ​ |  | 60,453 | ​
Tax-exempt | ​ |  | 73,067 | ​ |  | 2,660 | ​ | ​ | 621 | ​ |  | 75,106 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 2,618 | ​ |  | 96 | ​ | ​ | ​ | ​ |  | 2,714 | ​
U.S. government-sponsored enterprises | ​ |  | 108,269 | ​ |  | 1,340 | ​ |  | 1,864 | ​ |  | 107,745 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ |  | 12,581 | ​ |  | 684 | ​ |  | ​ | ​ |  | 13,265 | ​
Corporate debt securities | ​ | ​ | 3,000 | ​ | ​ | ​ | ​ | ​ | 36 | ​ | ​ | 2,964 | ​
Total | ​ | $ | 332,032 | ​ | $ | 7,452 | ​ | $ | 3,035 | ​ | $ | 336,449 | ​
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt state and municipals | ​ | $ | 6,847 | ​ | $ | 183 | ​ | ​ | ​ | ​ | $ | 7,030 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 16 | ​ |  | ​ | ​ | ​ | ​ | ​ |  | 16 | ​
U.S. government-sponsored enterprises | ​ |  | 241 | ​ |  | 7 | ​ | ​ | ​ | ​ |  | 248 | ​
Total | ​ | $ | 7,104 | ​ | $ | 190 | ​ | $ | ​ | ​ | $ | 7,294 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
December 31, 2020 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 18,478 | ​ | $ | 427 | ​ | ​ | ​ | ​ | $ | 18,905 | ​
U.S. government-sponsored enterprises | ​ | ​ | 63,834 | ​ | ​ | 1,354 | ​ | $ | ​ | ​ |  | 65,188 | ​
State and municipals: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ |  | 53,297 | ​ |  | 2,099 | ​ |  | 30 | ​ |  | 55,366 | ​
Tax-exempt | ​ |  | 53,977 | ​ |  | 3,054 | ​ |  | 37 | ​ |  | 56,994 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 3,553 | ​ |  | 154 | ​ |  | ​ | ​ |  | 3,707 | ​
U.S. government-sponsored enterprises | ​ |  | 79,457 | ​ |  | 1,930 | ​ |  | 136 | ​ |  | 81,251 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ | ​ | 12,619 | ​ | ​ | 881 | ​ | ​ | ​ | ​ | ​ | 13,500 | ​
Corporate debt securities | ​ | ​ | 1,000 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 1,000 | ​
Total | ​ | $ | 286,215 | ​ | $ | 9,899 | ​ | $ | 203 | ​ | $ | 295,911 | ​
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt state and municipals | ​ | $ | 6,849 | ​ | $ | 275 | ​ | $ | ​ | ​ | $ | 7,124 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | 21 | ​ |  | ​ | ​ | ​ | ​ | ​ |  | 21 | ​
U.S. government-sponsored enterprises | ​ |  | 355 | ​ |  | 13 | ​ | ​ | ​ | ​ |  | 368 | ​
Total | ​ | $ | 7,225 | ​ | $ | 288 | ​ | $ | ​ | ​ | $ | 7,513 | ​
Schedule of fair value and unrealized losses of investment securities in continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total |
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized |
June 30, 2021 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ | $ | 24,966 | ​ | $ | 514 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 24,966 | ​ | $ | 514 | ​
Tax-exempt | ​ | ​ | 29,981 | ​ | ​ | 621 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 29,981 | ​ | ​ | 621 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ | ​ | 77,089 | ​ | ​ | 1,863 | ​ | $ | 201 | ​ | $ | 1 | ​ | ​ | 77,290 | ​ |  | 1,864 | ​
Corporate debt securities | ​ | ​ | 2,964 | ​ | ​ | 36 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2,964 | ​ | ​ | 36 | ​
Total | ​ | $ | 135,000 | ​ | $ | 3,034 | ​ | $ | 201 | ​ | $ | 1 | ​ | $ | 135,201 | ​ | $ | 3,035 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total |
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized |
December 31, 2020 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ | $ | 9,246 | ​ | $ | 30 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 9,246 | ​ | $ | 30 | ​
Tax-exempt | ​ |  | 6,786 | ​ |  | 37 | ​ | ​ | ​ | ​ |  | ​ | ​ |  | 6,786 | ​ |  | 37 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​
U.S. government-sponsored enterprises | ​ |  | 11,553 | ​ | ​ | 135 | ​ | $ | 284 | ​ | $ | 1 | ​ | ​ | 11,837 | ​ | ​ | 136 | ​
Total | ​ | $ | 27,585 | ​ | $ | 202 | ​ | $ | 284 | ​ | $ | 1 | ​ | $ | 27,869 | ​ | $ | 203 | ​
Summary of unrealized and realized gains and losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, |  | ​ | 2021 |  | ​ | 2020
Net gain (loss) recognized during the period on equity securities | ​ | $ | (17) | ​ | $ | 39
Less: Net gain (loss) recognized during the period on equity securities sold during the period | ​ |  | ​ | ​ |  | ​
Unrealized gain (loss) recognized during the reporting period on equity securities still held at the reporting date | ​ | $ | (17) | ​ | $ | 39
​ | ​ |  | ​ | ​ |  | ​
​ | ​ |  | ​ | ​ |  | ​
For the Six Months Ended June 30, |  | ​ | 2021 |  | ​ | 2020
Net gain (loss) recognized during the period on equity securities | ​ | $ | 4 | ​ | $ | (84)
Less: Net gain (loss) recognized during the period on equity securities sold during the period | ​ |  | ​ | ​ |  | ​
Unrealized gain (loss) recognized during the reporting period on equity securities still held at the reporting date | ​ | $ | 4 | ​ | $ | (84)
Available-for-Sale Securities. |
Investment Securities |
Schedule of maturity distribution of fair value | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Fair |
June 30, 2021 |  | Value |
Within one year | ​ | $ | 41,834 | ​
After one but within five years | ​ |  | 37,132 | ​
After five but within ten years | ​ |  | 37,203 | ​
After ten years | ​ |  | 93,277 | ​
​ | ​ |  | 209,446 | ​
Mortgage-backed and other amortizing securities | ​ |  | 127,003 | ​
Total | ​ | $ | 336,449 | ​
Held-to-maturity Securities. |
Investment Securities |
Schedule of maturity distribution of fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair |
June 30, 2021 |  | Cost |  | Value |
Within one year | ​ | $ | 175 | ​ | $ | 175 | ​
After five but within ten years | ​ | ​ | 2,228 | ​ | ​ | 2,298 | ​
After ten years | ​ | ​ | 4,444 | ​ | ​ | 4,557 | ​
​ | ​ |  | 6,847 | ​ |  | 7,030 | ​
Mortgage-backed securities | ​ |  | 257 | ​ |  | 264 | ​
Total | ​ | $ | 7,104 | ​ | $ | 7,294 | ​

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