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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Statutory federal tax rate | 34.00% | 34.00% | 35.00%
Increase (decrease) resulting from: |  |  |
Tax exempt interest income | (13.00%) | (16.00%) | (11.30%)
Earnings from life insurance | (2.40%) | (4.70%) | (3.80%)
Disallowed interest expense | 1.00% | 1.00% | 0.40%
Low-income housing credits and related expense | (4.60%) | (7.20%) | (5.00%)
Regulatory settlement | 0.00% | 4.30% | 0.00%
Change in statutory federal tax rate | 0.00% | 2.30% | 0.00%
Expense due to enactment of federal tax reform legislation | 21.20% | 0.00% | 0.00%
Other | (1.30%) | 2.30% | 1.90%
Effective income tax rate | 34.90% | 16.00% | 17.20%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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