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Note 15 - Income Taxes - A Reconciliation of Income Tax Expense (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Computed at statutory rate 21.00% 21.00% 21.00%
State financial institution tax and credits (1.20%) (2.30%) (1.30%)
Cash surrender value of life insurance (1.60%) (1.00%) (1.10%)
Tax exempt interest (1.80%) (1.10%) (1.40%)
Non-dedecutible merger costs 0.00% 0.00% 1.00%
Other (1.10%) (1.40%) 2.00%
Actual effective rate 15.30% 15.20% 20.20%