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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 Tax Expense (Benefit) | Federal and state income tax expense consists of the following for the years ended December 31:
(dollars in thousands) |  | 2017 |  | 2016 |  | 2015 |
Current federal income tax expense |  | $ | 59,019 |  | $ | 53,290 |  | $ | 46,758 |
Current state income tax expense |  | 7,511 |  | 13,733 |  | 11,020 |
Total current tax expense |  | 66,530 |  | 67,023 |  | 57,778 |
Deferred federal income tax expense (benefit) |  | 18,459 |  | (5,523 | ) | (6,642 | )
Deferred state income tax expense (benefit) |  | 515 |  | (105 | ) | (87 | )
Total deferred tax expense (benefit) |  | 18,974 |  | (5,628 | ) | (6,729 | )
Total income tax expense |  | $ | 85,504 |  | $ | 61,395 |  | $ | 51,049 |
Schedule of Deferred Tax Assets and Liabilities | The table below summarizes significant components of our deferred tax assets and liabilities utilizing federal corporate income tax rates of 21% as of December 31, 2017 and 35% as of December 31, 2016 and 2015:
(dollars in thousands) |  | 2017 |  | 2016 |  | 2015 |
Deferred tax assets |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 16,568 |  | $ | 23,738 |  | $ | 21,191 |
Deferred loan fees and costs |  | 6,741 |  | 10,728 |  | 9,724 |
Deferred rent |  | 1,009 |  | 1,483 |  | 1,364 |
Stock-based compensation |  | 847 |  | 3,037 |  | 2,068 |
Net operating loss |  | 2,032 |  | 2,695 |  | 2,946 |
Unrealized loss on securities available-for-sale |  | 1,312 |  | 1,303 |  | — |
Unrealized loss on interest rate swap derivatives |  | — |  | 284 |  | — |
SERP |  | 1,373 |  | 2,088 |  | 1,776 |
Premises and equipment |  | 33 |  | 3,838 |  | 3,381 |
Other |  | 35 |  | 477 |  | 383 |
Total deferred tax assets |  | 29,950 |  | 49,671 |  | 42,833 |
Deferred tax liabilities |  |  |  |  |  |  |
Unrealized net gain on securities available for sale |  | — |  | — |  | (694 | )
Unrealized gain on interest rate swap derivatives |  | (578 | ) | — |  | — |
Excess servicing |  | (99 | ) | (191 | ) | (157 | )
Intangible assets |  | (503 | ) | (1,260 | ) | (1,671 | )
Total deferred tax liabilities |  | (1,180 | ) | (1,451 | ) | (2,522 | )
Net deferred income tax amount |  | $ | 28,770 |  | $ | 48,220 |  | $ | 40,311 |
Schedule of Effective Income Tax Rate Reconciliation | A reconciliation of the statutory federal income tax rate to the Company’s effective income tax rate for the years ended December 31 follows:
|  | 2017 |  | 2016 |  | 2015 |
Statutory federal income tax rate |  | 35.00 | % | 35.00 | % | 35.00 | %
Increase (decrease) due to |  |  |  |  |  |  |
State income taxes |  | 3.41 |  | 5.57 |  | 5.26 |
Deferred tax adjustment related to Tax Act |  | 7.85 |  | — |  | — |
Tax exempt interest and dividend income |  | (0.61 | ) | (0.98 | ) | (1.25 | )
Stock-based compensation expense |  | 0.01 |  | 0.01 |  | 0.02 |
Other |  | 0.38 |  | (1.01 | ) | (1.28 | )
Effective tax rates |  | 46.04 | % | 38.59 | % | 37.75 | %

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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