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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2018
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
| 2018 |  | 2017 |  | 2016
| (Dollars in thousands)
Current expense |  |  |  |  |
Federal | $ | 25,129 |  |  | $ | 28,852 |  |  | $ | 26,549 |
State | 13,672 |  |  | 9,278 |  |  | 8,883 |
Total current expense | 38,801 |  |  | 38,130 |  |  | 35,432 |
Deferred expense (benefit) |  |  |  |  |
Federal | (3,080 | ) |  | 7,953 |  |  | 153 |
State | (1,417 | ) |  | 1,258 |  |  | (158 | )
Total deferred expense (benefit) | (4,497 | ) |  | 9,211 |  |  | (5 | )
Total expense | $ | 34,304 |  |  | $ | 47,341 |  |  | $ | 35,427 |
Schedule of Income Tax Rate Reconciliation | The difference between the statutory federal income tax rate and the effective income tax rate reported for the last three years is detailed below:
| Years Ended December 31
| 2018 |  | 2017 |  | 2016
| (Dollars in thousands)
Computed statutory federal income tax provision | $ | 32,744 |  | 21.00 | % |  | $ | 47,091 |  | 35.00 | % |  | $ | 39,226 |  | 35.00 | %
State taxes, net of federal tax benefit | 9,633 |  | 6.18 | % |  | 6,817 |  | 5.07 | % |  | 5,643 |  | 5.03 | %
Merger and other related costs (non-deductible) | 130 |  | 0.08 | % |  | 213 |  | 0.16 | % |  | 210 |  | 0.19 | %
Change in valuation allowance | 49 |  | 0.03 | % |  | 31 |  | 0.02 | % |  | 28 |  | 0.02 | %
Revaluation of net deferred tax assets | — |  | — | % |  | 1,895 |  | 1.41 | % |  | — |  | — | %
New Markets Tax Credits | (3,960 | ) | (2.54 | )% |  | (3,960 | ) | (2.94 | )% |  | (6,360 | ) | (5.67 | )%
Increase in cash surrender value of life insurance | (1,160 | ) | (0.74 | )% |  | (1,445 | ) | (1.07 | )% |  | (1,431 | ) | (1.28 | )%
Low Income Housing Project Investments | (1,030 | ) | (0.66 | )% |  | (1,253 | ) | (0.93 | )% |  | (1,641 | ) | (1.46 | )%
Stock-based compensation | (885 | ) | (0.57 | )% |  | (1,258 | ) | (0.94 | )% |  | — |  | — | %
Nontaxable interest, net | (566 | ) | (0.36 | )% |  | (987 | ) | (0.73 | )% |  | (996 | ) | (0.89 | )%
Other, net | (651 | ) | (0.42 | )% |  | 197 |  | 0.15 | % |  | 748 |  | 0.67 | %
Total expense | $ | 34,304 |  | 22.00 | % |  | $ | 47,341 |  | 35.20 | % |  | $ | 35,427 |  | 31.61 | %
Schedule of Net Deferred Tax Asset | The tax-effected components of the net deferred tax asset at December 31 were as follows:
| 2018 |  | 2017
| (Dollars in thousands)
Deferred tax assets |  |  |
Accrued expenses not deducted for tax purposes | $ | 11,922 |  |  | $ | 9,268 |
Allowance for loan losses | 17,764 |  |  | 16,702 |
Deferred gain on sale leaseback transaction | 704 |  |  | 909 |
Employee and director equity compensation | 1,636 |  |  | 1,559 |
Federal Home Loan Bank borrowings fair value adjustment | 15 |  |  | 26 |
Loan basis difference fair value adjustment | 4,761 |  |  | 3,070 |
Net operating loss carry-forward | 170 |  |  | 127 |
Net unrealized loss on securities available for sale | 1,850 |  |  | 106 |
Other | 842 |  |  | 527 |
Gross deferred tax assets | 39,664 |  |  | 32,294 |
Valuation allowance | (170 | ) |  | (121 | )
Total deferred tax assets net of valuation allowance | $ | 39,494 |  |  | $ | 32,173 |
Deferred tax liabilities |  |  |
Core deposit and other intangibles | $ | 3,803 |  |  | $ | 2,057 |
Deferred loan fees, net | 4,759 |  |  | 4,275 |
Derivatives fair value adjustment | 2,413 |  |  | 524 |
Fixed assets | 5,259 |  |  | 5,270 |
Goodwill | 10,388 |  |  | 10,265 |
Prepaid pension | 3,483 |  |  | 3,056 |
Other | 1,139 |  |  | 1,251 |
Gross deferred tax liabilities | $ | 31,244 |  |  | $ | 26,698 |
Total net deferred tax asset | $ | 8,250 |  |  | $ | 5,475 |
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, 2016 | $ | 111 |
Increase for current year tax positions | 31 |
Balance at December 31, 2017 | 142 |
Increase for current year tax positions | 73 |
Balance at December 31, 2018 | $ | 215 |

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