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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 Tax Expense (Benefit) | At December 31, 2018, 2017 and 2016 income tax expense consisted of the following:
(Dollars in thousands) | 2018 |  | 2017 |  | 2016
Current tax expense |  |  |  |  |
Federal | $ | 95,151 |  |  | $ | 87,992 |  |  | $ | 84,946 |
State | 21,523 |  |  | 6,116 |  |  | 7,493 |
Total current tax expense | 116,674 |  |  | 94,108 |  |  | 92,439 |
Deferred tax expense (benefit) |  |  |  |  |
Federal | (10,944 | ) |  | 115,392 |  |  | 23,144 |
State | (2,433 | ) |  | 10,446 |  |  | 10,002 |
Total deferred tax expense (benefit) | (13,377 | ) |  | 125,838 |  |  | 33,146 |
Total income tax expense | $ | 103,297 |  |  | $ | 219,946 |  |  | $ | 125,585 |
Schedule of Effective Income Tax Rate Reconciliation | Income tax expense differed from the amounts computed by applying the statutory federal income tax rate of 21 percent for 2018 and 35 percent for 2017 and 2016 to pretax income as a result of the following:
(Dollars in thousands) | 2018 |  | 2017 |  | 2016
Income taxes at federal statutory rates | $ | 105,758 |  |  | $ | 190,294 |  |  | $ | 122,874 |
(Reduction) increase in income taxes resulting from: |  |  |  |  |
Nontaxable income on loans, leases and investments, net of nondeductible expenses | (1,796 | ) |  | (2,525 | ) |  | (2,901 | )
Nondeductible FDIC insurance expense | 2,348 |  |  | — |  |  | — |
State and local income taxes, including change in valuation allowance, net of federal income tax benefit | 15,081 |  |  | 10,765 |  |  | 11,372 |
Effect of federal rate change | (15,736 | ) |  | 25,762 |  |  | — |
Tax credits net of amortization | (2,891 | ) |  | (4,840 | ) |  | (4,138 | )
Other, net | 533 |  |  | 490 |  |  | (1,622 | )
Total income tax expense | $ | 103,297 |  |  | $ | 219,946 |  |  | $ | 125,585 |
Schedule of Deferred Tax Assets and Liabilities | The net deferred tax asset included the following components at December 31, 2018 and 2017:
(Dollars in thousands) | 2018 |  | 2017
Allowance for loan and lease losses | $ | 53,391 |  |  | $ | 50,853 |
Pension liability | — |  |  | 704 |
Executive separation from service agreements | 7,927 |  |  | 8,548 |
Net operating loss carryforwards | 6,862 |  |  | 2,685 |
Net unrealized loss included in comprehensive income | 32,663 |  |  | 10,849 |
Employee compensation | 11,145 |  |  | 4,192 |
FDIC assisted transactions timing differences | 7,622 |  |  | — |
Other reserves | 5,574 |  |  | 5,570 |
Other | 9,555 |  |  | 5,924 |
Deferred tax asset | 134,739 |  |  | 89,325 |
Accelerated depreciation | 4,987 |  |  | 7,562 |
Lease financing activities | 12,674 |  |  | 9,131 |
Net deferred loan fees and costs | 10,651 |  |  | 8,708 |
Intangible assets | 11,713 |  |  | 12,252 |
Security, loan and debt valuations | 4,557 |  |  | 7,018 |
FDIC assisted transactions timing differences | — |  |  | 1,113 |
Pension liability | 6,287 |  |  | — |
Other | 1,722 |  |  | 4,565 |
Deferred tax liability | 52,591 |  |  | 50,349 |
Net deferred tax asset | $ | 82,148 |  |  | $ | 38,976 |
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, 2018, 2017 and 2016:
(Dollars in thousands) | 2018 |  | 2017 |  | 2016
Unrecognized tax benefits at the beginning of the year | $ | 29,004 |  |  | $ | 28,879 |  |  | $ | 5,975 |
Reductions related to tax positions taken in prior year | (1,054 | ) |  | (44 | ) |  | (327 | )
Additions related to tax positions taken in current year | 1,433 |  |  | 169 |  |  | 23,231 |
Reductions related to lapse of statute of limitations | (1,128 | ) |  | — |  |  | — |
Unrecognized tax benefits at the end of the year | $ | 28,255 |  |  | $ | 29,004 |  |  | $ | 28,879 |

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