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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2014
Income Taxes [Abstract] |
Income tax provision | The income tax provision included in the statements of income was as follows for the years ended December 31, 2014, 2013 and 2012 ($ in thousands):
Current |  | 2014 |  |  | 2013 |  |  | 2012 |
Federal |  | $ | 17,761 |  |  | $ | 14,537 |  |  | $ | 48,186 |
State |  |  | 2,068 |  |  |  | 1,237 |  |  |  | 2,366 |
Deferred |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 16,256 |  |  |  | 18,394 |  |  |  | (7,349 | )
State |  |  | 2,444 |  |  |  | 2,769 |  |  |  | (1,103 | )
Income tax provision |  | $ | 38,529 |  |  | $ | 36,937 |  |  | $ | 42,100 |
Income tax reconciliation | For the years ended December 31, 2014, 2013 and 2012, the income tax provision differs from the amount computed by applying the statutory federal income tax rate of 35% to income before income taxes as a result of the following ($ in thousands):
|  | 2014 |  |  | 2013 |  |  | 2012 |
Income tax computed at statutory tax rate |  | $ | 56,732 |  |  | $ | 53,899 |  |  | $ | 55,784 |
Tax exempt interest |  |  | (5,612 | ) |  |  | (5,222 | ) |  |  | (5,150 | )
Nondeductible interest expense |  |  | 107 |  |  |  | 121 |  |  |  | 144 |
State income taxes, net |  |  | 2,933 |  |  |  | 2,604 |  |  |  | 821 |
Income tax credits |  |  | (15,212 | ) |  |  | (15,755 | ) |  |  | (9,255 | )
Other |  |  | (419 | ) |  |  | 1,290 |  |  |  | (244 | )
Income tax provision |  | $ | 38,529 |  |  | $ | 36,937 |  |  | $ | 42,100 |
Deferred tax assets and liabilities | Temporary differences between the financial statement carrying amounts and the tax basis of assets and liabilities gave rise to the following net deferred tax assets at December 31, 2014 and 2013, which are included in other assets ($ in thousands):
Deferred tax assets: |  | 2014 |  |  | 2013 |
Loan purchase accounting |  | $ | 38,471 |  |  | $ | 63,048 |
Other real estate |  |  | 36,086 |  |  |  | 47,981 |
Allowance for loan losses |  |  | 31,241 |  |  |  | 29,102 |
Deferred compensation |  |  | 20,825 |  |  |  | 20,000 |
Realized built in losses |  |  | 15,907 |  |  |  | 9,182 |
Securities |  |  | 15,443 |  |  |  | 17,741 |
Pension and other postretirement benefit plans |  |  | 14,904 |  |  |  | 7,511 |
Nonaccrual loans |  |  | 3,372 |  |  |  | 4,452 |
Stock-based compensation |  |  | 3,077 |  |  |  | 3,357 |
Other |  |  | 17,833 |  |  |  | 14,771 |
Gross deferred tax asset |  |  | 197,159 |  |  |  | 217,145 |
Valuation allowance |  |  | (8,650 | ) |  |  | (16,000 | )
Deferred tax asset net of valuation allowance |  |  | 188,509 |  |  |  | 201,145 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Goodwill and other identifiable intangibles |  |  | 28,010 |  |  |  | 29,809 |
Premises and equipment |  |  | 20,813 |  |  |  | 21,543 |
Unrealized gains on securities available for sale |  |  | 8,627 |  |  |  | 1,969 |
Mortgage servicing rights |  |  | 7,747 |  |  |  | 8,145 |
Securities |  |  | 1,353 |  |  |  | 1,270 |
Leases |  |  | 625 |  |  |  | 3,290 |
Other |  |  | 3,900 |  |  |  | 4,642 |
Gross deferred tax liability |  |  | 71,075 |  |  |  | 70,668 |
Net deferred tax asset |  | $ | 117,434 |  |  | $ | 130,477 |
Changes in unrecognized tax benefits | The following table provides a summary of the changes during the 2014 calendar year in the amount of unrecognized tax benefits that are included in other liabilities in the consolidated balance sheet ($ in thousands):
Balance at January 1, 2014 |  | $ | 1,779 |
Increases due to tax positions taken during the current year |  |  | 670 |
Increases due to tax positions taken during a prior year |  |  | 60 |
Decreases due to the lapse of applicable statute of limitations during the current year |  |  | (306 | )
Decreases due to settlements with taxing authorities during the current year |  |  | (43 | )
Balance at December 31, 2014 |  | $ | 2,160 |
Accrued interest, net of federal benefit, at December 31, 2014 |  | $ | 437 |
Unrecognized tax benefits that would impact the effective tax rate, if recognized, at December 31, 2014 |  | $ | 1,603 |

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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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- Definition Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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