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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Components of the Company's Income Tax Expense (Benefit) | The components of the Company’s income tax expense (benefit) are as follows:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (Dollars in thousands) |
Current taxes: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 23,700 |  |  | $ | 39,569 |  |  | $ | 34,003 |
State |  |  | 7,083 |  |  |  | 5,914 |  |  |  | 5,308 |
Deferred taxes |  |  | 3,155 |  |  |  | 4,383 |  |  |  | (2,048 | )
Total income taxes |  | $ | 33,938 |  |  | $ | 49,866 |  |  | $ | 37,263 |
Reconciliation of Tax Expense at the Federal Statutory Tax Rate | Income tax expense for 2017 was impacted by the write-down of net deferred tax asset of $4.3 million resulting from the federal tax rate change under the Tax Cuts and Jobs Act, enacted December 22, 2017. A reconciliation of tax expense at the federal statutory tax rate applied to income before taxes is presented in the following table. The federal statutory tax rate was 21% in 2018 and 35% in 2017 and 2016:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (Dollars in thousands) |
Tax expense at the federal statutory tax rate |  | $ | 33,546 |  |  | $ | 47,708 |  |  | $ | 37,778 |
Increase (decrease) in tax expense from: |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt income, net |  |  | (510 | ) |  |  | (829 | ) |  |  | (756 | )
Modified endowment life contracts |  |  | (558 | ) |  |  | (921 | ) |  |  | (852 | )
Share based compensation excess tax benefit |  |  | (917 | ) |  |  | (2,354 | ) |  |  | — |
State tax expense, net of federal tax benefit |  |  | 5,595 |  |  |  | 3,840 |  |  |  | 3,250 |
Write-down of net deferred tax asset |  |  | — |  |  |  | 4,331 |  |  |  | — |
Utilization of tax credits: |  |  |  |  |  |  |  |  |  |  |  |
New markets tax credits |  |  | (1,422 | ) |  |  | (1,151 | ) |  |  | (1,254 | )
Low-income housing tax credits, net of amortization |  |  | (1,273 | ) |  |  | (1,589 | ) |  |  | (1,424 | )
Other tax credits |  |  | — |  |  |  | — |  |  |  | (319 | )
Other, net |  |  | (523 | ) |  |  | 831 |  |  |  | 840 |
Total tax expense |  | $ | 33,938 |  |  | $ | 49,866 |  |  | $ | 37,263 |
Summary of Net Deferred Tax Asset Reported in Other Assets | The net deferred tax asset consisted of the following and is reported in other assets:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  | (Dollars in thousands) |
Provision for loan losses |  | $ | 13,089 |  |  | $ | 13,123 |
Unrealized net losses on securities |  |  | 731 |  |  |  | 739 |
Write-downs of other real estate owned |  |  | 462 |  |  |  | 473 |
Deferred compensation |  |  | 2,209 |  |  |  | 2,113 |
Stock-based compensation |  |  | 1,448 |  |  |  | 1,351 |
Investments in partnership interests |  |  | 4,274 |  |  |  | 3,758 |
Other |  |  | 963 |  |  |  | 275 |
Gross deferred tax assets |  |  | 23,176 |  |  |  | 21,832 |
Premium on securities of banks acquired |  |  | (185 | ) |  |  | (219 | )
Intangibles |  |  | (5,376 | ) |  |  | (3,359 | )
Basis difference related to tax credits |  |  | (2,560 | ) |  |  | (2,713 | )
Depreciation |  |  | (8,484 | ) |  |  | (4,563 | )
Leveraged lease |  |  | — |  |  |  | (821 | )
Prepaid expense deducted |  |  | (1,178 | ) |  |  | (887 | )
Other |  |  | (181 | ) |  |  | (180 | )
Gross deferred tax liabilities |  |  | (17,964 | ) |  |  | (12,742 | )
Net deferred tax asset |  | $ | 5,212 |  |  | $ | 9,090 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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