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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Statutory federal tax rate | 34.00% | 35.00% | 35.00%
Increase (decrease) resulting from: |  |  |
State taxes, net of federal benefit | 0.10% | 0.10% | 0.10%
Tax exempt interest income | (16.00%) | (11.30%) | (7.30%)
Valuation allowance on deferred tax assets | 0.00% | 0.00% | (145.80%)
Earnings from life insurance | (4.70%) | (3.80%) | (2.60%)
Disallowed interest expense | 1.00% | 0.40% | 0.20%
Low-income housing credits and related expense | (7.20%) | (5.00%) | (3.70%)
Regulatory settlement | 4.30% | 0.00% | 0.00%
Change in statutory federal tax rate | 2.30% | 0.00% | 0.00%
Other | 2.20% | 1.80% | 0.10%
Effective income tax rate | 16.00% | 17.20% | (124.00%)

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