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INCOME AND FRANCHISE TAXES (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of components of income tax expense (benefit) |
| Current |  | Deferred |  | Total
| (Dollars in thousands)
Year ended December 31, 2015 |  |  |  |  |  |  |  |
Federal | $ | 1,128 |  |  | $ | 20,061 |  |  | $ | 21,189 |
State | (119 | ) |  | 6,018 |  |  | 5,899 |
Total | $ | 1,009 |  |  | $ | 26,079 |  |  | $ | 27,088 |
Components of income tax expense (benefit) for the years ended December 31, 2017, 2016 and 2015 were as follows:
| Current |  | Deferred |  | Total
| (Dollars in thousands)
Year ended December 31, 2017 |  |  |  |  |  |  |  |
Federal | $ | 1,727 |  |  | $ | 27,263 |  |  | $ | 28,990 |
State | (81 | ) |  | 4,943 |  |  | 4,862 |
Total | $ | 1,646 |  |  | $ | 32,206 |  |  | $ | 33,852 |
| Current |  | Deferred |  | Total
| (Dollars in thousands)
Year ended December 31, 2016 |  |  |  |  |  |  |  |
Federal | $ | 805 |  |  | $ | 19,842 |  |  | $ | 20,647 |
State | (4 | ) |  | 4,585 |  |  | 4,581 |
Total | $ | 801 |  |  | $ | 24,427 |  |  | $ | 25,228 |
Schedule of the reasons of difference between the income tax expense (benefit) and the expected tax expense | Income tax expense (benefit) for the periods presented differed from the "expected" tax expense (computed by applying the U.S. federal corporate tax rate of 35% to income (loss) before income taxes) for the following reasons:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Computed "expected" tax expense (benefit) | $ | 26,270 |  |  | $ | 25,260 |  |  | $ | 25,535 |
Increase (decrease) in taxes resulting from: |  |  |  |  |  |  |
Tax-exempt interest | (1,387 | ) |  | (1,410 | ) |  | (1,420 | )
Other tax-exempt income | (1,186 | ) |  | (940 | ) |  | (712 | )
Low-income housing and energy tax credits | (1,135 | ) |  | (899 | ) |  | (946 | )
State income taxes, net of Federal income tax effect, excluding impact of deferred tax valuation allowance | 3,145 |  |  | 2,981 |  |  | 3,834 |
Change in the beginning-of-the-year balance of the valuation allowance for deferred tax assets allocated to income tax expense | 570 |  |  | (52 | ) |  | (44 | )
Estimated impact of Tax Reform on net deferred tax assets | 7,440 |  |  | — |  |  | — |
Other, net | 135 |  |  | 288 |  |  | 841 |
Total | $ | 33,852 |  |  | $ | 25,228 |  |  | $ | 27,088 |
Schedule of the tax effects of temporary differences giving rise to significant portions of the deferred tax assets and deferred tax liabilities | The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities were as follows:
| December 31,
| 2017 |  | 2016
| (Dollars in thousands)
Deferred tax assets |  |  |  |  |
Allowance for loan and lease losses | $ | 10,622 |  |  | $ | 19,926 |
Accrued expenses | 294 |  |  | 644 |
Employee retirement benefits | 2,784 |  |  | 6,138 |
Federal and state tax credit carryforwards | 12,473 |  |  | 33,803 |
Federal and state net operating loss carryforwards | 3,306 |  |  | 2,732 |
Restricted stock and non-qualified stock options | 661 |  |  | 412 |
Premises and equipment | 3,633 |  |  | 4,106 |
Other | 3,169 |  |  | 5,060 |
Total deferred tax assets | 36,942 |  |  | 72,821 |
Deferred tax liabilities |  |  |  |
Intangible assets | 4,785 |  |  | 8,138 |
Other | 2,343 |  |  | 3,006 |
Total deferred tax liabilities | 7,128 |  |  | 11,144 |
Less: Deferred tax valuation allowance | 3,321 |  |  | 2,751 |
Net deferred tax assets | $ | 26,493 |  |  | $ | 58,926 |

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