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Income Taxes - Schedule of 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
Increase (reduction) in income tax resulting from: |  |  |  |  |  |  |  |  |  |  |
Income tax expense at statutory rate |  |  |  |  |  |  |  |  | $ 19,309 | $ 24,368 | $ 21,961
Tax-exempt interest income, net |  |  |  |  |  |  |  |  | (2,010) | (962) | (506)
State and local income taxes, net |  |  |  |  |  |  |  |  | 3,254 | 2,816 | 2,423
Bank-owned life insurance, net |  |  |  |  |  |  |  |  | (778) | (628) | (452)
Non-deductible expenses |  |  |  |  |  |  |  |  | 637 | 749 | 294
Tax benefit (expense) of LIHTC investments, net |  |  |  |  |  |  |  |  | (444) | (278) | (50)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount |  |  |  |  |  |  |  |  | (175) | (526) | (1,631)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount |  |  |  |  |  |  |  |  | (1,327) | (913) | (4,627)
Non-taxable subsidiary dividend |  |  |  |  |  |  |  |  | 0 | 0 | (2,728)
Non-taxable donation to charitable foundation |  |  |  |  |  |  |  |  | 0 | (420) | 0
Other, net |  |  |  |  |  |  |  |  | (903) | (909) | 676
Total income tax expense | $ 6,508 | $ 4,428 | $ 3,656 | $ 2,971 | $ 7,246 | $ 7,469 | $ 4,479 | $ 4,103 | $ 17,563 | $ 23,297 | $ 15,360

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