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Income Taxes | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes (In Thousands) Significant components of the provision for income taxes (benefits) are as follows for the periods presented:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Current |  |  |  |  |
Federal | $ | 31,679 |  |  | $ | 17,004 |  |  | $ | 16,474 |
State | 2,131 |  |  | 995 |  |  | 540 |
| 33,810 |  |  | 17,999 |  |  | 17,014 |
Deferred |  |  |  |  |
Federal | 10,480 |  |  | 12,625 |  |  | 8,649 |
State | 557 |  |  | 1,126 |  |  | 642 |
| 11,037 |  |  | 13,751 |  |  | 9,291 |
| $ | 44,847 |  |  | $ | 31,750 |  |  | $ | 26,305 |
The reconciliation of income taxes computed at the United States federal statutory tax rates to the provision for income taxes is as follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Tax at U.S. statutory rate | $ | 47,522 |  |  | $ | 34,918 |  |  | $ | 30,061 |
Increase (decrease) in taxes resulting from: |  |  |  |  |
Tax-exempt interest income | (3,467 | ) |  | (3,377 | ) |  | (3,215 | )
BOLI income | (1,622 | ) |  | (1,264 | ) |  | (1,045 | )
Investment tax credits | (1,390 | ) |  | (1,390 | ) |  | (1,390 | )
Amortization of investment in low-income housing tax credits | 1,742 |  |  | 1,734 |  |  | 1,594 |
State income tax expense, net of federal benefit | 1,747 |  |  | 1,378 |  |  | 921 |
Decrease to valuation allowance | — |  |  | — |  |  | (152 | )
Other items, net | 315 |  |  | (249 | ) |  | (469 | )
| $ | 44,847 |  |  | $ | 31,750 |  |  | $ | 26,305 |
Significant components of the Company’s deferred tax assets and liabilities are as follows for the periods presented:
| December 31,
| 2016 |  | 2015
Deferred tax assets |  |  |
Allowance for loan losses | $ | 19,934 |  |  | $ | 17,430 |
Loans | 23,240 |  |  | 26,239 |
Deferred compensation | 11,254 |  |  | 17,060 |
Net unrealized losses on securities | 10,096 |  |  | 6,065 |
Impairment of assets | 2,512 |  |  | 3,271 |
Net operating loss carryforwards | 2,867 |  |  | 3,681 |
Other | 7,149 |  |  | 7,499 |
Gross deferred tax assets | 77,052 |  |  | 81,245 |
Valuation allowance on state net operating loss carryforwards | — |  |  | — |
Total deferred tax assets | 77,052 |  |  | 81,245 |
Deferred tax liabilities |  |  |
FDIC indemnification asset | — |  |  | 1,927 |
Investment in partnerships | 1,556 |  |  | 2,507 |
Core deposit intangible | — |  |  | 3,386 |
Depreciation | 2,517 |  |  | 673 |
Mortgage servicing rights | 3,360 |  |  | 4,032 |
Subordinated debt | 4,111 |  |  | 4,287 |
Other | 2,876 |  |  | 2,364 |
Total deferred tax liabilities | 14,420 |  |  | 19,176 |
Net deferred tax assets | $ | 62,632 |  |  | $ | 62,069 |
The Company and its subsidiaries file a consolidated U.S. federal income tax return. The Company is currently open to audit under the statute of limitations by the Internal Revenue Service for the years ending December 31, 2013 through 2015. The Company and its subsidiaries’ state income tax returns are open to audit under the statute of limitations for the years ended December 31, 2013 through 2015. The Company acquired federal and state net operating losses as part of the Heritage acquisition. The federal net operating loss acquired totaled $18,321, of which $6,883 remained to be utilized as of December 31, 2016, while state net operating losses totaled $17,168, of which $11,412 remained to be utilized as of December 31, 2016. Both the federal and state net operating losses will expire at various dates beginning in 2031. The Company expects to utilize the federal and state net operating losses prior to expiration. Because the benefits are expected to be fully realized, the Company recorded no valuation allowance against the net operating losses for the year end December 31, 2016. A reconciliation of the beginning and ending amount of unrecognized tax benefits, excluding interest, related to federal and state income tax matters as of December 31 is as follows:
| 2016 |  | 2015 |  | 2014
Balance at January 1 | $ | 1,485 |  |  | $ | 2,653 |  |  | $ | 2,178 |
Additions based on positions related to current period | 25 |  |  | 367 |  |  | 475 |
Additions based on positions related to prior period | — |  |  | — |  |  | — |
Reductions based on positions related to prior period | — |  |  | (201 | ) |  | — |
Settlements | — |  |  | (1,334 | ) |  | — |
Reductions due to lapse of statute of limitations | — |  |  | — |  |  | — |
Balance at December 31 | $ | 1,510 |  |  | $ | 1,485 |  |  | $ | 2,653 |
If ultimately recognized, the Company does not anticipate any material increase in the effective tax rate for 2016 relative to any tax positions taken prior to January 1, 2016. The Company had accrued $169, $125 and $686 for interest and penalties related to unrecognized tax benefits as of December 31, 2016, 2015 and 2014, respectively.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: 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=65882285&loc=d3e32718-109319 Reference 4: 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=65882285&loc=d3e32639-109319 Reference 5: 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=65882285&loc=d3e32537-109319 + Details
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