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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Note 11 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) |  |  |  |  |  |  |  |  |  |  |
Taxes at federal statutory rate |  |  |  |  |  |  |  |  | $ 9,489 | $ 11,200 | $ 13,752
Taxes at federal statutory rate, percentage |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
State and local income tax, net of Federal income tax benefit |  |  |  |  |  |  |  |  | $ 1,043 | $ 1,274 | $ 1,439
State and local income tax, net of Federal income tax benefit, percentage |  |  |  |  |  |  |  |  | 2.30% | 2.40% | 2.20%
Tax exempt |  |  |  |  |  |  |  |  | $ (875) | $ (878) | $ (1,961)
Tax exempt, percentage |  |  |  |  |  |  |  |  | (1.90%) | (1.60%) | (3.00%)
Nondeductible merger expense |  |  |  |  |  |  |  |  | $ 543 | $ 328 |
Nondeductible merger expense, percentage |  |  |  |  |  |  |  |  | 1.20% | 0.60% |
Other |  |  |  |  |  |  |  |  | $ 308 | $ 128 | $ (2,835)
Other, percentage |  |  |  |  |  |  |  |  | 0.70% | 0.30% | (4.30%)
Total provision for income taxes | $ 417 | $ 4,489 | $ 5,808 | $ (206) | $ 3,957 | $ 2,536 | $ 3,272 | $ 2,287 | $ 10,508 | $ 12,052 | $ 10,395
Taxes at effective rate, percentage |  |  |  |  |  |  |  |  | 23.30% | 22.70% | 15.90%

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