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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of Change in Accounting Policy | As a result of this accounting policy change, the following presents the effect of the change on our consolidated statements of income for prior periods that were retrospectively adjusted:
| December 31, 2018 |  | December 31, 2017 |  | December 31, 2016
Consolidated statements |  |  |  |  | Impact of |  |  |  |  |  | Impact of |  |  |  |  |  | Impact of
of income: | Unadjusted |  | Adjusted |  | Change |  | Unadjusted |  | Adjusted |  | Change |  | Unadjusted |  | Adjusted |  | Change
| (Dollars in thousands)
Other operating expense | $ | 135,687 |  |  | $ | 134,682 |  |  | $ | (1,005 | ) |  | $ | 131,817 |  |  | $ | 131,073 |  |  | $ | (744 | ) |  | $ | 133,563 |  |  | $ | 132,518 |  |  | $ | (1,045 | )
Income tax expense | 17,753 |  |  | 18,758 |  |  | 1,005 |  |  | 33,852 |  |  | 34,596 |  |  | 744 |  |  | 25,228 |  |  | 26,273 |  |  | 1,045 |
Net income | 59,486 |  |  | 59,486 |  |  | — |  |  | 41,204 |  |  | 41,204 |  |  | — |  |  | 46,992 |  |  | 46,992 |  |  | — |

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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