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INCOME TAXES - Reconciliation of Effective Income Tax Rate to Statutory Federal Rate (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Statutory federal tax rate | 21.00% | 21.00% | 21.00%
Increase (decrease) resulting from: |  |  |
State taxes, net of federal benefit | 1.10% | 1.00% | (0.10%)
Tax exempt interest income | (1.70%) | (2.00%) | (4.20%)
Income from life insurance | (0.90%) | (1.10%) | (1.70%)
Disallowed interest expense | 0.00% | 0.10% | 0.30%
Low-income housing credits and related expense | (0.20%) | (0.80%) | (1.30%)
Merger related | 0.00% | 0.00% | 0.70%
Other | 0.30% | 0.40% | (0.90%)
Effective income tax rate | 19.60% | 18.60% | 13.80%

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