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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2016
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
| 2016 |  | 2015 |  | 2014
| (Dollars in thousands)
Current expense |  |  |  |  |
Federal | $ | 26,549 |  |  | $ | 11,946 |  |  | $ | 14,709 |
State | 8,883 |  |  | 5,052 |  |  | 6,350 |
Total current expense | 35,432 |  |  | 16,998 |  |  | 21,059 |
Deferred expense (benefit) |  |  |  |  |
Federal | 153 |  |  | 8,466 |  |  | 2,877 |
State | (158 | ) |  | 1,754 |  |  | (37 | )
Total deferred expense (benefit) | (5 | ) |  | 10,220 |  |  | 2,840 |
Total expense | $ | 35,427 |  |  | $ | 27,218 |  |  | $ | 23,899 |
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
| 2016 |  | 2015 |  | 2014
| (Dollars in thousands)
Computed statutory federal income tax provision | $ | 39,226 |  | 35.00 | % |  | $ | 32,262 |  | 35.00 | % |  | $ | 29,310 |  | 35.00 | %
State taxes, net of federal tax benefit | 5,643 |  | 5.03 | % |  | 4,500 |  | 4.88 | % |  | 4,104 |  | 4.90 | %
Nontaxable interest, net | (996 | ) | (0.89 | )% |  | (973 | ) | (1.06 | )% |  | (795 | ) | (0.95 | )%
New Markets Tax Credits | (6,360 | ) | (5.67 | )% |  | (6,514 | ) | (7.07 | )% |  | (6,708 | ) | (8.01 | )%
Low Income Housing Project Investments | (1,641 | ) | (1.46 | )% |  | (1,182 | ) | (1.28 | )% |  | (594 | ) | (0.71 | )%
Increase in cash surrender value of life insurance and gain on life insurance benefits | (1,431 | ) | (1.28 | )% |  | (1,292 | ) | (1.40 | )% |  | (1,782 | ) | (2.13 | )%
Merger and other related costs (non-deductible) | 210 |  | 0.19 | % |  | 185 |  | 0.20 | % |  | 274 |  | 0.33 | %
Change in valuation allowance | 28 |  | 0.02 | % |  | 41 |  | 0.04 | % |  | — |  | — | %
Other, net | 748 |  | 0.67 | % |  | 191 |  | 0.22 | % |  | 90 |  | 0.11 | %
Total expense | $ | 35,427 |  | 31.61 | % |  | $ | 27,218 |  | 29.53 | % |  | $ | 23,899 |  | 28.54 | %
Schedule of Net Deferred Tax Asset | The tax-effected components of the net deferred tax asset at December 31 were as follows:
| 2016 |  | 2015
| (Dollars in thousands)
Deferred tax assets |  |  |
Accrued expenses not deducted for tax purposes | $ | 15,401 |  |  | $ | 14,621 |
Allowance for loan losses | 24,681 |  |  | 22,744 |
Deferred gain on sale leaseback transaction | 1,744 |  |  | 2,158 |
Derivatives fair value adjustment | — |  |  | 1,033 |
Employee and director equity compensation | 2,095 |  |  | 2,466 |
Federal Home Loan Bank borrowings fair value adjustment | 82 |  |  | 108 |
Loan basis difference fair value adjustment | 4,336 |  |  | 3,789 |
Net operating loss carry-forward | 69 |  |  | 41 |
New Markets Tax Credit carry-forward | — |  |  | 459 |
Other | 1,015 |  |  | 451 |
Gross deferred tax assets | 49,423 |  |  | 47,870 |
Valuation allowance | (69 | ) |  | (41 | )
Total deferred tax assets net of valuation allowance | $ | 49,354 |  |  | $ | 47,829 |
Deferred tax liabilities |  |  |
Core deposit and other intangibles | $ | 3,040 |  |  | $ | 3,785 |
Deferred loan fees, net | 5,407 |  |  | 4,872 |
Fixed assets | 6,168 |  |  | 7,269 |
Goodwill | 14,737 |  |  | 14,576 |
Net unrealized gain on securities available for sale | 105 |  |  | 805 |
Derivatives fair value adjustment | 454 |  |  | — |
Other | 3,909 |  |  | 2,468 |
Gross deferred tax liabilities | $ | 33,820 |  |  | $ | 33,775 |
Total net deferred tax asset | $ | 15,534 |  |  | $ | 14,054 |
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, 2014 | $ | — |
Reduction of tax positions for prior years | — |
Increase for prior year tax position | — |
Increase for current year tax positions | 81 |
Balance at December 31, 2015 | $ | 81 |
Reduction of tax positions for prior years | — |
Increase for prior year tax positions | — |
Increase for current year tax positions | 30 |
Balance at December 31, 2016 | $ | 111 |

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