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Investment securities (Tables) | 3 Months Ended
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Mar. 31, 2022
Investment Securities |
Schedule of amortized cost and fair value of investment securities aggregated by investment category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
March 31, 2022 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 250,268 | ​ | $ | 28 | ​ | $ | 12,624 | ​ | $ | 237,672 | ​
U.S. government-sponsored enterprises | ​ | ​ | 28,174 | ​ | ​ | 31 | ​ | ​ | 184 | ​ | ​ | 28,021 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ |  | 69,027 | ​ | ​ | 106 | ​ | ​ | 6,021 | ​ |  | 63,112 | ​
Tax-exempt | ​ |  | 99,805 | ​ |  | 505 | ​ | ​ | 6,843 | ​ |  | 93,467 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 1,563 | ​ |  | 9 | ​ | ​ | 1 | ​ |  | 1,571 | ​
U.S. government-sponsored enterprises | ​ |  | 105,652 | ​ |  | 50 | ​ |  | 9,168 | ​ |  | 96,534 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ |  | 12,396 | ​ |  | 14 | ​ |  | 129 | ​ |  | 12,281 | ​
Corporate debt securities | ​ | ​ | 3,000 | ​ | ​ | ​ | ​ | ​ | 176 | ​ | ​ | 2,824 | ​
Total | ​ | $ | 569,885 | ​ | $ | 743 | ​ | $ | 35,146 | ​ | $ | 535,482 | ​
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt state and municipals | ​ | $ | 11,266 | ​ | $ | 30 | ​ | $ | 653 | ​ | $ | 10,643 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 18,511 | ​ |  | ​ | ​ | ​ | 1,315 | ​ |  | 17,196 | ​
U.S. government-sponsored enterprises | ​ |  | 66,052 | ​ |  | 1 | ​ | ​ | 4,612 | ​ |  | 61,441 | ​
Total | ​ | $ | 95,829 | ​ | $ | 31 | ​ | $ | 6,580 | ​ | $ | 89,280 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
December 31, 2021 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 193,849 | ​ | $ | 107 | ​ | $ | 2,382 | ​ | $ | 191,574 | ​
U.S. government-sponsored enterprises | ​ | ​ | 33,435 | ​ | ​ | 343 | ​ | ​ | ​ | ​ |  | 33,778 | ​
State and municipals: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ |  | 69,066 | ​ |  | 994 | ​ | ​ | 1,082 | ​ |  | 68,978 | ​
Tax-exempt | ​ |  | 96,412 | ​ |  | 2,452 | ​ |  | 614 | ​ |  | 98,250 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ |  | 1,790 | ​ |  | 53 | ​ |  | ​ | ​ |  | 1,843 | ​
U.S. government-sponsored enterprises | ​ |  | 109,018 | ​ |  | 939 | ​ |  | 2,925 | ​ |  | 107,032 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ | ​ | 12,542 | ​ | ​ | 406 | ​ | ​ | ​ | ​ | ​ | 12,948 | ​
Corporate debt securities | ​ | ​ | 3,000 | ​ | ​ | ​ | ​ | ​ | 82 | ​ | ​ | 2,918 | ​
Total | ​ | $ | 519,112 | ​ | $ | 5,294 | ​ | $ | 7,085 | ​ | $ | 517,321 | ​
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tax-exempt state and municipals | ​ | $ | 11,476 | ​ | $ | 126 | ​ | $ | 56 | ​ | $ | 11,546 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | 18,802 | ​ |  | ​ | ​ | ​ | 392 | ​ |  | 18,410 | ​
U.S. government-sponsored enterprises | ​ |  | 40,935 | ​ |  | 3 | ​ | ​ | 448 | ​ |  | 40,490 | ​
Total | ​ | $ | 71,213 | ​ | $ | 129 | ​ | $ | 896 | ​ | $ | 70,446 | ​
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 |
March 31, 2022 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 230,144 |  | $ | 12,624 |  | ​ | ​ |  | ​ | ​ |  | $ | 230,144 |  | $ | 12,624 | ​
U.S. government-sponsored enterprises | ​ | ​ | 13,918 | ​ | ​ | 184 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 13,918 | ​ | ​ | 184 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ | ​ | 47,356 | ​ | ​ | 4,074 | ​ | $ | 11,711 | ​ | $ | 1,947 | ​ | ​ | 59,067 | ​ | ​ | 6,021 | ​
Tax-exempt | ​ | ​ | 59,847 | ​ | ​ | 5,420 | ​ | ​ | 13,125 | ​ | ​ | 2,076 | ​ | ​ | 72,972 | ​ | ​ | 7,496 | ​
Residential mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | 17,193 | ​ | ​ | 1,316 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 17,193 | ​ | ​ | 1,316 | ​
U.S. government-sponsored enterprises | ​ | ​ | 91,894 | ​ | ​ | 6,551 | ​ | ​ | 58,780 | ​ | ​ | 7,229 | ​ | ​ | 150,674 | ​ |  | 13,780 | ​
Commercial mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government-sponsored enterprises | ​ |  | 10,042 | ​ |  | 129 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 10,042 | ​ |  | 129 | ​
Corporate debt securities | ​ | ​ | 2,356 | ​ | ​ | 144 | ​ | ​ | 468 | ​ | ​ | 32 | ​ | ​ | 2,824 | ​ | ​ | 176 | ​
Total | ​ | $ | 472,750 | ​ | $ | 30,442 | ​ | $ | 84,084 | ​ | $ | 11,284 | ​ | $ | 556,834 | ​ | $ | 41,726 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total |
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized |
December 31, 2021 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 179,974 |  | $ | 2,382 |  | ​ | ​ |  | ​ | ​ |  | $ | 179,974 |  | $ | 2,382 | ​
State and municipals: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Taxable | ​ | ​ | 26,827 | ​ | ​ | 718 | ​ | $ | 8,008 | ​ | $ | 364 | ​ | ​ | 34,835 | ​ | ​ | 1,082 | ​
Tax-exempt | ​ |  | 38,693 | ​ |  | 357 | ​ | ​ | 10,319 | ​ |  | 313 | ​ |  | 49,012 | ​ |  | 670 | ​
Residential mortgage-backed securities: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agencies | ​ | ​ | 18,398 | ​ |  | 392 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 18,398 | ​ |  | 392 | ​
U.S. government-sponsored enterprises | ​ |  | 77,875 | ​ |  | 1,454 | ​ | ​ | 48,276 | ​ | ​ | 1,919 | ​ |  | 126,151 | ​ |  | 3,373 | ​
Corporate debt securities | ​ |  | 2,449 | ​ |  | 51 | ​ | ​ | 470 | ​ | ​ | 31 | ​ |  | 2,919 | ​ |  | 82 | ​
Total | ​ | $ | 344,216 | ​ | $ | 5,354 | ​ | $ | 67,073 | ​ | $ | 2,627 | ​ | $ | 411,289 | ​ | $ | 7,981 | ​
Available-for-Sale Securities |
Investment Securities |
Schedule of maturity distribution of fair value | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Fair |
March 31, 2022 |  | Value |
Within one year | ​ | $ | 19,709 | ​
After one but within five years | ​ |  | 205,581 | ​
After five but within ten years | ​ |  | 95,545 | ​
After ten years | ​ |  | 101,618 | ​
​ | ​ |  | 422,453 | ​
Mortgage-backed and other amortizing securities | ​ |  | 113,029 | ​
Total | ​ | $ | 535,482 | ​
Held-to-maturity Securities. |
Investment Securities |
Schedule of maturity distribution of fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair |
March 31, 2022 |  | Cost |  | Value |
After five but within ten years | ​ | $ | 8,098 | ​ | $ | 7,657 | ​
After ten years | ​ | ​ | 3,168 | ​ | ​ | 2,986 | ​
​ | ​ |  | 11,266 | ​ |  | 10,643 | ​
Mortgage-backed securities | ​ |  | 84,563 | ​ |  | 78,637 | ​
Total | ​ | $ | 95,829 | ​ | $ | 89,280 | ​

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 + Details
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