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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2014
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) | 2014 |  | 2013 |  | 2012
Current tax expense |  |  |  |  |
Federal | $ | 84,430 |  |  | $ | 46,848 |  |  | $ | 89,939 |
State | 13,941 |  |  | 7,080 |  |  | 9,212 |
Total current tax expense | 98,371 |  |  | 53,928 |  |  | 99,151 |
Deferred tax (benefit) expense |  |  |  |  |
Federal | (30,658 | ) |  | 38,731 |  |  | (26,501 | )
State | (2,681 | ) |  | 8,915 |  |  | (7,921 | )
Total deferred tax (benefit) expense | (33,339 | ) |  | 47,646 |  |  | (34,422 | )
Total income tax expense | $ | 65,032 |  |  | $ | 101,574 |  |  | $ | 64,729 |
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) | 2014 |  | 2013 |  | 2012
Income taxes at statutory rates | $ | 71,258 |  |  | $ | 93,956 |  |  | $ | 68,993 |
Increase (reduction) in income taxes resulting from: |  |  |  |  |
Nontaxable income on loans, leases and investments, net of nondeductible expenses | (1,832 | ) |  | (1,185 | ) |  | (1,309 | )
State and local income taxes, including change in valuation allowance, net of federal income tax benefit | 7,319 |  |  | 10,397 |  |  | 839 |
Acquisition stock settlement | (10,185 | ) |  | — |  |  | — |
Tax credits net of amortization | (2,896 | ) |  | (960 | ) |  | (2,372 | )
Other, net | 1,368 |  |  | (634 | ) |  | (1,422 | )
Total income tax expense | $ | 65,032 |  |  | $ | 101,574 |  |  | $ | 64,729 |
Schedule of Deferred Tax Assets and Liabilities | The net deferred tax asset included the following components at December 31:
(Dollars in thousands) | 2014 |  | 2013
Allowance for loan and lease losses | $ | 79,537 |  |  | $ | 90,790 |
Pension liability | 15,391 |  |  | 2,593 |
Executive separation from service agreements | 23,849 |  |  | 9,321 |
State operating loss carryforward | 29 |  |  | 36 |
Unrealized loss on cash flow hedge | 1,673 |  |  | 2,786 |
Net unrealized loss on securities included in accumulated other comprehensive loss | — |  |  | 6,541 |
Accelerated depreciation | 5,550 |  |  | — |
FDIC assisted transactions timing differences | 71,219 |  |  | 42,016 |
Other reserves | 15,326 |  |  | 6,958 |
Other | 25,746 |  |  | 10,569 |
Deferred tax asset | 238,320 |  |  | 171,610 |
Accelerated depreciation | — |  |  | 4,382 |
Lease financing activities | 10,762 |  |  | 10,216 |
Net unrealized gain on securities included in accumulated other comprehensive loss | 3,245 |  |  | — |
Net deferred loan fees and costs | 4,772 |  |  | 4,302 |
Intangible assets | 7,729 |  |  | 17,558 |
Security, loan and debt valuations | 34,289 |  |  | — |
Other | 11,395 |  |  | 4,564 |
Deferred tax liability | 72,192 |  |  | 41,022 |
Net deferred tax asset | $ | 166,128 |  |  | $ | 130,588 |

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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=6907707&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=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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