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Note 10 - Income Taxes - Difference In Statutory Federal Income Tax Rate and Effective Tax Rate (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statutory tax rate	21.00%	21.00%	21.00%	21.00%
Tax exempt interest	(0.60%)	(0.70%)	(1.00%)	(0.60%)
Tax exempt income on bank-owned life insurance	(2.60%)	(1.20%)	(3.20%)	(1.10%)
Captive insurance premium income	(1.40%)	(0.50%)	(2.50%)	(0.70%)
Affordable housing tax credit limited partnerships	(1.80%)	(1.50%)	(2.90%)	(1.40%)
Nondeductible merger-related expenses	0.20%	1.70%	1.60%	0.70%
Other, net	0.20%	0.10%	0.30%	0.30%
Effective tax rate	15.00%	18.90%	13.30%	18.20%

X

- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt insurance premium income from a captive insurance agency.

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The effective income tax reconciliation for tax exempt interest

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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