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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Statutory federal tax rate | 21.00% | 21.00% | 21.00%
Increase (decrease) resulting from: |  |  |
State taxes, net of federal benefit | 1.00% | (0.10%) | 0.00%
Tax exempt interest income | (2.00%) | (4.20%) | (7.70%)
Income from life insurance | (1.10%) | (1.70%) | (1.70%)
Disallowed interest expense | 0.10% | 0.30% | 0.80%
Low-income housing credits and related expense | (0.80%) | (1.30%) | (2.50%)
Merger related | 0.00% | 0.70% | 0.60%
Other | 0.40% | (0.90%) | 0.90%
Effective income tax rate | 18.60% | 13.80% | 11.40%

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 + Details
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