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Investment securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investment Securities |
Schedule of amortized cost and fair value of investment securities aggregated by investment category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
September 30, 2021 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 135,816 | ​ | $ | 191 | ​ | $ | 610 | ​ | $ | 135,397 | ​
U.S. government-sponsored enterprises | ​ | ​ | 40,969 | ​ | ​ | 621 | ​ | ​ | ​ | ​ | ​ | 41,590 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ |  | 66,535 | ​ | ​ | 1,315 | ​ | ​ | 949 | ​ |  | 66,901 | ​
Tax-exempt | ​ |  | 89,124 | ​ |  | 2,389 | ​ | ​ | 1,028 | ​ |  | 90,485 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 2,087 | ​ |  | 71 | ​ | ​ | ​ | ​ |  | 2,158 | ​
U.S. government-sponsored enterprises | ​ |  | 109,992 | ​ |  | 1,199 | ​ |  | 2,471 | ​ |  | 108,720 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ |  | 12,562 | ​ |  | 598 | ​ |  | ​ | ​ |  | 13,160 | ​
Corporate debt securities | ​ | ​ | 3,000 | ​ | ​ | ​ | ​ | ​ | 39 | ​ | ​ | 2,961 | ​
Total | ​ | $ | 460,085 | ​ | $ | 6,384 | ​ | $ | 5,097 | ​ | $ | 461,372 | ​
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt state and municipals | ​ | $ | 10,384 | ​ | $ | 146 | ​ | $ | 59 | ​ | $ | 10,471 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 11,361 | ​ |  | ​ | ​ | ​ | 195 | ​ |  | 11,166 | ​
U.S. government-sponsored enterprises | ​ |  | 11,103 | ​ |  | 4 | ​ | ​ | 188 | ​ |  | 10,919 | ​
Total | ​ | $ | 32,848 | ​ | $ | 150 | ​ | $ | 442 | ​ | $ | 32,556 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | 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 | ​
Summary of unrealized and realized gains and losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, |  | ​ | 2021 |  | ​ | 2020
Net gain recognized during the period on equity securities | ​ | $ | 5 | ​ | $ | 2
Less: Net gain (loss) recognized during the period on equity securities sold during the period | ​ |  | ​ | ​ |  | ​
Unrealized gain recognized during the reporting period on equity securities still held at the reporting date | ​ | $ | 5 | ​ | $ | 2
​ | ​ |  | ​ | ​ |  | ​
​ | ​ |  | ​ | ​ |  | ​
For the Nine Months Ended September 30, |  | ​ | 2021 |  | ​ | 2020
Net gain (loss) recognized during the period on equity securities | ​ | $ | 9 | ​ | $ | (82)
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 | ​ | $ | 9 | ​ | $ | (82)
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 |
September 30, 2021 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 102,789 |  | $ | 610 |  | ​ | ​ |  | ​ | ​ |  | $ | 102,789 |  | $ | 610 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ | ​ | 29,122 | ​ | ​ | 771 | ​ | $ | 4,283 | ​ | $ | 178 | ​ | $ | 33,405 | ​ | $ | 949 | ​
Tax-exempt | ​ | ​ | 52,825 | ​ | ​ | 1,087 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 52,825 | ​ | ​ | 1,087 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | 11,279 | ​ | ​ | 195 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 11,279 | ​ | $ | 195 | ​
U.S. government-sponsored enterprises | ​ | ​ | 89,214 | ​ | ​ | 2,502 | ​ | ​ | 7,069 | ​ | ​ | 157 | ​ | ​ | 96,283 | ​ |  | 2,659 | ​
Corporate debt securities | ​ | ​ | 2,961 | ​ | ​ | 39 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2,961 | ​ | ​ | 39 | ​
Total | ​ | $ | 288,190 | ​ | $ | 5,204 | ​ | $ | 11,352 | ​ | $ | 335 | ​ | $ | 299,542 | ​ | $ | 5,539 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​
Available-for-Sale Securities. |
Investment Securities |
Schedule of maturity distribution of fair value | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Fair |
September 30, 2021 |  | Value |
Within one year | ​ | $ | 38,277 | ​
After one but within five years | ​ |  | 95,877 | ​
After five but within ten years | ​ |  | 93,524 | ​
After ten years | ​ |  | 106,538 | ​
​ | ​ |  | 334,216 | ​
Mortgage-backed and other amortizing securities | ​ |  | 127,156 | ​
Total | ​ | $ | 461,372 | ​
Held-to-maturity Securities. |
Investment Securities |
Schedule of maturity distribution of fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair |
September 30, 2021 |  | Cost |  | Value |
After five but within ten years | ​ | $ | 5,940 | ​ | $ | 5,938 | ​
After ten years | ​ | ​ | 4,444 | ​ | ​ | 4,533 | ​
​ | ​ |  | 10,384 | ​ |  | 10,471 | ​
Mortgage-backed securities | ​ |  | 22,464 | ​ |  | 22,085 | ​
Total | ​ | $ | 32,848 | ​ | $ | 32,556 | ​

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