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Income taxes - Reconciliation of Effective Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income taxes |  |  |
Provision for income tax at statutory rate | $ 1,778 | $ 6,825 | $ 9,527
State tax, net of federal benefit | 95 | 397 | 216
Tax exempt interest | (1,237) | (1,057) | (1,400)
Bank owned life insurance income | (360) | (221) | (205)
Residential housing program tax credits | (631) | (755) | (911)
Nondeductible transaction costs | 206 | 179 |
Other, net | 119 | (247) | 49
Total income tax (benefit) expense | $ (30) | $ 5,121 | $ 7,276
Provision for income tax at statutory rate (as percentage) | 21.00% | 21.00% | 21.00%
State tax, net of federal benefit (as percentage) | 1.16% | 1.22% | 0.63%
Tax exempt interest (as percentage) | (14.61%) | (3.25%) | (3.09%)
Bank owned life insurance income (as percentage) | (4.25%) | (0.68%) | (0.45%)
Residential housing program tax credits (as percentage) | (7.45%) | (2.32%) | (2.01%)
Nondeductible transaction costs (as percentage) | 2.43% | 0.55% |
Other, net (as percentage) | 1.36% | (0.76%) | (0.04%)
Total (as percentage) | (0.36%) | 15.76% | 16.04%

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- Definition US Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + References No definition available. + Details
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