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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) | At December 31, income tax expense consisted of the following:
(Dollars in thousands) | 2017 |  | 2016 |  | 2015
Current tax expense |  |  |  |  |
Federal | $ | 87,992 |  |  | $ | 84,946 |  |  | $ | 105,367 |
State | 6,116 |  |  | 7,493 |  |  | 16,111 |
Total current tax expense | 94,108 |  |  | 92,439 |  |  | 121,478 |
Deferred tax expense (benefit) |  |  |  |  |
Federal | 115,392 |  |  | 23,144 |  |  | (2,758 | )
State | 10,446 |  |  | 10,002 |  |  | 3,308 |
Total deferred tax expense | 125,838 |  |  | 33,146 |  |  | 550 |
Total income tax expense | $ | 219,946 |  |  | $ | 125,585 |  |  | $ | 122,028 |
Schedule of Effective Income Tax Rate Reconciliation | Income tax expense differed from the amounts computed by applying the federal income tax rate of 35 percent to pretax income as a result of the following:
(Dollars in thousands) | 2017 |  | 2016 |  | 2015
Income taxes at federal statutory rates | $ | 190,294 |  |  | $ | 122,874 |  |  | $ | 116,345 |
Increase (reduction) in income taxes resulting from: |  |  |  |  |
Nontaxable income on loans, leases and investments, net of nondeductible expenses | (2,525 | ) |  | (2,901 | ) |  | (3,020 | )
State and local income taxes, including change in valuation allowance, net of federal income tax benefit | 10,765 |  |  | 11,372 |  |  | 12,622 |
Effect of federal rate change | 25,762 |  |  | — |  |  | — |
Acquisition stock settlement | — |  |  | (98 | ) |  | — |
Tax credits net of amortization | (4,840 | ) |  | (4,138 | ) |  | (3,060 | )
Other, net | 490 |  |  | (1,524 | ) |  | (859 | )
Total income tax expense | $ | 219,946 |  |  | $ | 125,585 |  |  | $ | 122,028 |
Schedule of Deferred Tax Assets and Liabilities | The net deferred tax asset included the following components at December 31:
(Dollars in thousands) | 2017 |  | 2016
Allowance for loan and lease losses | $ | 50,853 |  |  | $ | 80,939 |
Pension liability | 704 |  |  | 15,679 |
Executive separation from service agreements | 8,548 |  |  | 14,278 |
Federal net operating loss carryforward | 2,685 |  |  | 5,019 |
Net unrealized loss on securities included in accumulated other comprehensive loss | 10,849 |  |  | 26,832 |
Accelerated depreciation | — |  |  | 133 |
FDIC assisted transactions timing differences | — |  |  | 52,579 |
Other reserves | 5,570 |  |  | 10,504 |
Other | 10,116 |  |  | 26,663 |
Deferred tax asset | 89,325 |  |  | 232,626 |
Accelerated depreciation | 7,562 |  |  | — |
Lease financing activities | 9,131 |  |  | 11,651 |
Net deferred loan fees and costs | 8,708 |  |  | 10,867 |
Intangible assets | 12,252 |  |  | 6,335 |
Security, loan and debt valuations | 7,018 |  |  | 22,656 |
FDIC assisted transactions timing differences | 1,113 |  |  | — |
Other | 4,565 |  |  | 8,501 |
Deferred tax liability | 50,349 |  |  | 60,010 |
Net deferred tax asset | $ | 38,976 |  |  | $ | 172,616 |
Schedule of Unrecognized Tax Benefits | The following table provides a rollforward of Bancshares’ gross unrecognized tax benefits, excluding interest and penalties, during the years ended December 31:
(Dollars in thousands) | 2017 |  | 2016 |  | 2015
Unrecognized tax benefits at the beginning of the year | $ | 28,879 |  |  | $ | 5,975 |  |  | $ | 3,865 |
Reductions related to tax positions taken in prior year | — |  |  | (327 | ) |  | (79 | )
Additions related to tax positions taken in current year | 125 |  |  | 23,231 |  |  | 2,189 |
Unrecognized tax benefits at the end of the year | $ | 29,004 |  |  | $ | 28,879 |  |  | $ | 5,975 |

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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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