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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
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) | 2015 |  | 2014 |  | 2013
Current tax expense |  |  |  |  |
Federal | $ | 105,367 |  |  | $ | 84,430 |  |  | $ | 46,848 |
State | 16,111 |  |  | 13,941 |  |  | 7,080 |
Total current tax expense | 121,478 |  |  | 98,371 |  |  | 53,928 |
Deferred tax (benefit) expense |  |  |  |  |
Federal | (2,758 | ) |  | (30,658 | ) |  | 38,731 |
State | 3,308 |  |  | (2,681 | ) |  | 8,915 |
Total deferred tax (benefit) expense | 550 |  |  | (33,339 | ) |  | 47,646 |
Total income tax expense | $ | 122,028 |  |  | $ | 65,032 |  |  | $ | 101,574 |
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) | 2015 |  | 2014 |  | 2013
Income taxes at statutory rates | $ | 116,345 |  |  | $ | 71,258 |  |  | $ | 93,956 |
Increase (reduction) in income taxes resulting from: |  |  |  |  |
Nontaxable income on loans, leases and investments, net of nondeductible expenses | (3,020 | ) |  | (1,832 | ) |  | (1,185 | )
State and local income taxes, including change in valuation allowance, net of federal income tax benefit | 12,622 |  |  | 7,319 |  |  | 10,397 |
Acquisition stock settlement | — |  |  | (10,185 | ) |  | — |
Tax credits net of amortization | (3,060 | ) |  | (2,896 | ) |  | (960 | )
Other, net | (859 | ) |  | 1,368 |  |  | (634 | )
Total income tax expense | $ | 122,028 |  |  | $ | 65,032 |  |  | $ | 101,574 |
Schedule of Deferred Tax Assets and Liabilities | The net deferred tax asset included the following components at December 31:
(Dollars in thousands) | 2015 |  | 2014
Allowance for loan and lease losses | $ | 78,878 |  |  | $ | 79,537 |
Pension liability | 7,206 |  |  | 17,147 |
Executive separation from service agreements | 9,856 |  |  | 13,753 |
State operating loss carryforward | 21 |  |  | 29 |
Unrealized loss on cash flow hedge | 537 |  |  | 1,673 |
Net unrealized loss on securities included in accumulated other comprehensive loss | 9,379 |  |  | — |
Accelerated depreciation | 13,195 |  |  | 3,495 |
FDIC assisted transactions timing differences | 66,456 |  |  | 77,388 |
Other reserves | 10,772 |  |  | 12,770 |
Other | 29,279 |  |  | 26,788 |
Deferred tax asset | 225,579 |  |  | 232,580 |
Lease financing activities | 15,492 |  |  | 12,706 |
Net unrealized gain on securities included in accumulated other comprehensive loss | — |  |  | 3,245 |
Net deferred loan fees and costs | 6,051 |  |  | 4,532 |
Intangible assets | 2,040 |  |  | 7,789 |
Security, loan and debt valuations | 31,486 |  |  | 40,910 |
Other | 12,026 |  |  | 13,287 |
Deferred tax liability | 67,095 |  |  | 82,469 |
Net deferred tax asset | $ | 158,484 |  |  | $ | 150,111 |

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