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Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amounts |  |  |
Income tax at statutory rates | $ 6,136,000 | $ 5,026,000 | $ 4,734,000
State income taxes | 1,449,000 | 695,000 | 575,000
Tax-exempt interest income | (493,000) | (453,000) | (574,000)
Excess compensation | 328,000 |  |
Change in tax law | (326,000) |  |
Income from bank-owned life insurance | (107,000) | (149,000) | (89,000)
Investments in qualified housing projects | (82,000) | (93,000) | (85,000)
Share-based compensation | (77,000) | (126,000) | (103,000)
Merger related expenses | 29,000 | 96,000 |
Other | (62,000) | 86,000 | 63,000
Income tax expense | $ 6,795,000 | $ 5,082,000 | $ 4,521,000
Percent of Pre-tax Income |  |  |
Effective tax rate (as a percent) | 21.00% | 21.00% | 21.00%
State income taxes (as a percent) | 5.00% | 2.90% | 2.60%
Tax-exempt interest income (as a percent) | (1.70%) | (1.90%) | (2.50%)
Excess compensation (as a percent) | 1.10% |  |
Change in tax law (as a percent) | (1.10%) |  |
Income from bank-owned life insurance (as a percent) | (0.40%) | (0.60%) | (0.40%)
Investments in qualified housing projects (as a percent) | (0.30%) | (0.40%) | (0.40%)
Share-based compensation (as a percent) | (0.30%) | (0.50%) | (0.50%)
Merger related expenses | 0.10% | 0.40% |
Other | (0.20%) | 0.30% | 0.30%
Income tax expense (as a percent) | 23.20% | 21.20% | 20.10%

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