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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income taxes |
Schedule of current and deferred amounts of the provision for income taxes expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2023 |  | 2022 |  | 2021 |
Current | ​ | $ | 3,853 | ​ | $ | 6,665 | ​ | $ | 9,548 | ​
Deferred | ​ | ​ | 1,268 | ​ | ​ | 611 | ​ | ​ | 450 | ​
Total income tax expense | ​ | $ | 5,121 | ​ | $ | 7,276 | ​ | $ | 9,998 | ​
Schedule of the components of the net deferred tax asset | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2023 |  | 2022 |
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for loan losses | ​ | $ | 4,789 | ​ | $ | 5,916 | ​
Lease liability | ​ | ​ | 2,397 | ​ | ​ | 1,787 | ​
Defined benefit plan | ​ |  | 1,635 | ​ |  | 1,798 | ​
Deferred compensation | ​ |  | 694 | ​ |  | 860 | ​
Deferred loan fees and costs | ​ | ​ | ​ | ​ | ​ | 59 | ​
Investment securities available for sale | ​ | ​ | 11,270 | ​ | ​ | 14,266 | ​
Other | ​ |  | 339 | ​ |  | 196 | ​
Total | ​ |  | 21,124 | ​ |  | 24,882 | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease right-of-use assets | ​ | ​ | 2,313 | ​ | ​ | 1,718 | ​
Premises and equipment, net | ​ |  | 2,109 | ​ |  | 1,692 | ​
Merger related accounting | ​ |  | 474 | ​ | ​ | 472 | ​
Deferred loan costs | ​ | ​ | 92 | ​ | ​ | ​ | ​
Accrued compensation | ​ |  | 1,912 | ​ |  | 1,872 | ​
Other | ​ |  | 454 | ​ |  | 389 | ​
Total | ​ |  | 7,354 | ​ |  | 6,143 | ​
Net deferred tax asset | ​ | $ | 13,770 | ​ | $ | 18,739 | ​
Schedule of the reconciliation between the amount of the effective income tax expense and the income tax expense that would have been provided at the federal statutory rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | 2023 | ​ | ​ | ​ | 2022 | ​ | ​ | ​ | 2021 | ​
(Dollars in thousands, except percents) |  | Amount |  | % | ​ |  | Amount |  | % | ​ |  | Amount | ​ | % |
Provision for income tax at statutory rate | ​ | $ | 6,825 | ​ | 21.00 | % | ​ | $ | 9,527 | ​ | 21.00 | % | ​ | $ | 11,239 | ​ | 21.00 | %
State tax, net of federal benefit | ​ | ​ | 397 | ​ | 1.22 | ​ | ​ | ​ | 216 | ​ | 0.63 | ​ | ​ | ​ | 475 | ​ | 0.89 | ​
Tax exempt interest | ​ |  | (1,057) | ​ | (3.25) | ​ | ​ |  | (1,400) | ​ | (3.09) | ​ | ​ |  | (1,194) | ​ | (2.23) | ​
Bank owned life insurance income | ​ |  | (221) | ​ | (0.68) | ​ | ​ |  | (205) | ​ | (0.45) | ​ | ​ |  | (119) | ​ | (0.22) | ​
Residential housing program tax credits | ​ |  | (755) | ​ | (2.32) | ​ | ​ | ​ | (911) | ​ | (2.01) | ​ | ​ | ​ | (1,091) | ​ | (2.04) | ​
Nondeductible transaction costs | ​ | ​ | 179 | ​ | 0.55 | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​
Other, net | ​ |  | (247) | ​ | (0.76) | ​ | ​ |  | 49 | ​ | (0.04) | ​ | ​ |  | 688 | ​ | 1.29 | ​
Total | ​ | $ | 5,121 | ​ | 15.76 | % | ​ | $ | 7,276 | ​ | 16.04 | % | ​ | $ | 9,998 | ​ | 18.69 | %

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 9 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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