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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Taxes | The provision for income taxes is comprised of the following components:
| Years Ended December 31
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Current expense |  |  |  |  |
Federal | $ | 28,852 |  |  | $ | 26,549 |  |  | $ | 11,946 |
State | 9,278 |  |  | 8,883 |  |  | 5,052 |
Total current expense | 38,130 |  |  | 35,432 |  |  | 16,998 |
Deferred expense (benefit) |  |  |  |  |
Federal | 7,953 |  |  | 153 |  |  | 8,466 |
State | 1,258 |  |  | (158 | ) |  | 1,754 |
Total deferred expense (benefit) | 9,211 |  |  | (5 | ) |  | 10,220 |
Total expense | $ | 47,341 |  |  | $ | 35,427 |  |  | $ | 27,218 |
Schedule of Income Tax Rate Reconciliation | The difference between the statutory federal income tax rate of 35% and the effective income tax rate reported for the last three years is detailed below:
| Years Ended December 31
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Computed statutory federal income tax provision | $ | 47,091 |  | 35.00 | % |  | $ | 39,226 |  | 35.00 | % |  | $ | 32,262 |  | 35.00 | %
State taxes, net of federal tax benefit | 6,817 |  | 5.07 | % |  | 5,643 |  | 5.03 | % |  | 4,500 |  | 4.88 | %
Revaluation of net deferred tax assets | 1,895 |  | 1.41 | % |  | — |  | — | % |  | — |  | — | %
Merger and other related costs (non-deductible) | 213 |  | 0.16 | % |  | 210 |  | 0.19 | % |  | 185 |  | 0.20 | %
Change in valuation allowance | 31 |  | 0.02 | % |  | 28 |  | 0.02 | % |  | 41 |  | 0.04 | %
New Markets Tax Credits | (3,960 | ) | (2.94 | )% |  | (6,360 | ) | (5.67 | )% |  | (6,514 | ) | (7.07 | )%
Increase in cash surrender value of life insurance | (1,445 | ) | (1.07 | )% |  | (1,431 | ) | (1.28 | )% |  | (1,292 | ) | (1.40 | )%
Stock-based compensation | (1,258 | ) | (0.94 | )% |  | — |  | — | % |  | — |  | — | %
Low Income Housing Project Investments | (1,253 | ) | (0.93 | )% |  | (1,641 | ) | (1.46 | )% |  | (1,182 | ) | (1.28 | )%
Nontaxable interest, net | (987 | ) | (0.73 | )% |  | (996 | ) | (0.89 | )% |  | (973 | ) | (1.06 | )%
Other, net | 197 |  | 0.15 | % |  | 748 |  | 0.67 | % |  | 191 |  | 0.22 | %
Total expense | $ | 47,341 |  | 35.20 | % |  | $ | 35,427 |  | 31.61 | % |  | $ | 27,218 |  | 29.53 | %
Schedule of Net Deferred Tax Asset | The tax-effected components of the net deferred tax asset at December 31 were as follows:
| 2017 |  | 2016
| (Dollars in thousands)
Deferred tax assets |  |  |
Accrued expenses not deducted for tax purposes | $ | 9,268 |  |  | $ | 15,401 |
Allowance for loan losses | 16,702 |  |  | 24,681 |
Deferred gain on sale leaseback transaction | 909 |  |  | 1,744 |
Employee and director equity compensation | 1,559 |  |  | 2,095 |
Federal Home Loan Bank borrowings fair value adjustment | 26 |  |  | 82 |
Loan basis difference fair value adjustment | 3,070 |  |  | 4,336 |
Net operating loss carry-forward | 127 |  |  | 69 |
Net unrealized loss on securities available for sale | 106 |  |  | — |
Other | 527 |  |  | 1,015 |
Gross deferred tax assets | 32,294 |  |  | 49,423 |
Valuation allowance | (121 | ) |  | (69 | )
Total deferred tax assets net of valuation allowance | $ | 32,173 |  |  | $ | 49,354 |
Deferred tax liabilities |  |  |
Core deposit and other intangibles | $ | 2,057 |  |  | $ | 3,040 |
Deferred loan fees, net | 4,275 |  |  | 5,407 |
Fixed assets | 5,270 |  |  | 6,168 |
Goodwill | 10,265 |  |  | 14,737 |
Net unrealized gain on securities available for sale | — |  |  | 105 |
Derivatives fair value adjustment | 524 |  |  | 454 |
Other | 4,307 |  |  | 3,909 |
Gross deferred tax liabilities | $ | 26,698 |  |  | $ | 33,820 |
Total net deferred tax asset | $ | 5,475 |  |  | $ | 15,534 |
Reconciliation of Unrecognized Tax Benefits | The Company accounts for uncertainties in income taxes by providing a tax reserve for certain positions. The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits:
| (Dollars in thousands)
Balance at December 31, 2015 | $ | 81 |
Reduction of tax positions for prior years | — |
Increase for prior year tax position | — |
Increase for current year tax positions | 30 |
Balance at December 31, 2016 | $ | 111 |
Reduction of tax positions for prior years | — |
Increase for prior year tax positions | — |
Increase for current year tax positions | 31 |
Balance at December 31, 2017 | $ | 142 |

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