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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Current and Deferred Amounts of Income Tax Expense (Benefit) | The current and deferred amounts of income tax expense (benefit) for the years ended December 31, 2017, 2016 and 2015 are as follows (in thousands):
| Years ended December 31,
| 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |
Federal | $ | 4,163 |  |  | 32,506 |  |  | 33,778 |
State | 1,731 |  |  | 1,314 |  |  | 2,337 |
Total current | 5,894 |  |  | 33,820 |  |  | 36,115 |
Deferred: |  |  |  |  |
Federal | 39,003 |  |  | 2,606 |  |  | (525 | )
State | 1,631 |  |  | 554 |  |  | 851 |
Total deferred | 40,634 |  |  | 3,160 |  |  | 326 |
| $ | 46,528 |  |  | 36,980 |  |  | 36,441 |
Reconciliation between Amount Reported and Amount Computed for Income Tax Expense and Income Tax Rate | A reconciliation between the amount of reported total income tax expense and the amount computed by multiplying the applicable statutory income tax rate is as follows (in thousands):
| Years ended December 31,
| 2017 |  | 2016 |  | 2015
Tax expense at statutory rate of 35% | $ | 49,167 |  |  | 43,674 |  |  | 42,057 |
Increase (decrease) in taxes resulting from: |  |  |  |  |
State tax, net of federal income tax benefit | 2,185 |  |  | 1,215 |  |  | 2,072 |
Tax-exempt interest income | (5,097 | ) |  | (5,286 | ) |  | (5,520 | )
Bank-owned life insurance | (2,343 | ) |  | (1,915 | ) |  | (1,871 | )
Enactment of Tax Act | 3,912 |  |  | — |  |  | — |
Other, net | (1,296 | ) |  | (708 | ) |  | (297 | )
| $ | 46,528 |  |  | 36,980 |  |  | 36,441 |
Deferred Tax Assets and Liabilities | The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2017 and 2016 are as follows (in thousands):
| 2017 |  | 2016
Deferred tax assets: |  |  |
Allowance for loan losses | $ | 14,884 |  |  | 23,852 |
Post-retirement benefit | 7,265 |  |  | 11,150 |
Deferred compensation | 1,382 |  |  | 2,447 |
Purchase accounting adjustments | 1,242 |  |  | 1,979 |
Depreciation | 2,284 |  |  | 4,025 |
SERP | 651 |  |  | 966 |
ESOP | 2,000 |  |  | 3,203 |
Stock-based compensation | 4,066 |  |  | 5,259 |
Non-accrual interest | 839 |  |  | 3,738 |
Unrealized loss on securities | 1,180 |  |  | 350 |
State NOL | 18 |  |  | 81 |
Federal NOL | 270 |  |  | 742 |
Pension liability adjustments | 1,495 |  |  | 2,051 |
Other | 2,561 |  |  | 1,817 |
Total gross deferred tax assets | 40,137 |  |  | 61,660 |
Deferred tax liabilities: |  |  |
Deferred REIT dividend | 22,264 |  |  | — |
Pension expense | 6,857 |  |  | 10,255 |
Deferred loan costs | 4,043 |  |  | 5,477 |
Investment securities, principally due to accretion of discounts | 79 |  |  | 167 |
Intangibles | 775 |  |  | 548 |
Originated mortgage servicing rights | 184 |  |  | 313 |
Total gross deferred tax liabilities | 34,202 |  |  | 16,760 |
Net deferred tax asset | $ | 5,935 |  |  | 44,900 |

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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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- 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=84230637&loc=d3e32537-109319 + Details
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