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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2014
Income Tax Disclosure [Abstract] |
Current and Deferred Amounts of Provision for Income Taxes Expense (Benefit) | The current and deferred amounts of the provision for income taxes expense (benefit) for each of the years ended December 31, 2014, 2013 and 2012 are summarized as follows:
Year Ended December 31 |  | 2014 |  |  | 2013 |  |  | 2012 |
Current |  | $ | 4,313 |  |  | $ | 1,628 |  |  | $ | 2,705 |
Deferred |  |  | 1,146 |  |  |  | (1,143 | ) |  |  | 353 |
|  | $ | 5,459 |  |  | $ | 485 |  |  | $ | 3,058 |
Components of Net Deferred Tax Asset | The components of the net deferred tax asset at December 31, 2014 and 2013 are summarized as follows:
December 31 |  | 2014 |  |  | 2013 |
Deferred tax assets: |  |  |  |  |  |  |  |
Allowance for loan losses |  | $ | 3,618 |  |  | $ | 2,940 |
Defined benefit plan |  |  | 2,648 |  |  |  | 1,359 |
Deferred compensation |  |  | 529 |  |  |  | 10 |
Other-than-temporary impairment on securities |  |  |  |  |  |  | 131 |
Merger related accounting |  |  |  |  |  |  | 244 |
Capital loss carry forward |  |  | 244 |  |  |  | 244 |
Other |  |  | 259 |  |  |  | 170 |
Total |  |  | 7,298 |  |  |  | 5,098 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Premises and equipment, net |  |  | 912 |  |  |  | 976 |
Merger related accounting |  |  | 2,131 |  |  |  |  |
Investment securities available-for-sale |  |  | 2,202 |  |  |  | 959 |
Other |  |  | 324 |  |  |  | 83 |
Total |  |  | 5,569 |  |  |  | 2,018 |
Net deferred tax asset |  | $ | 1,729 |  |  | $ | 3,080 |
Reconciliation of Effective Income Tax Expense | A reconciliation between the amount of the effective income tax expense and the income tax expense that would have been provided at the federal statutory rate of 35.0 percent for the year ended December 31, 2014 and 34.0 percent in each of the years ended December 31, 2013 and 2012 is summarized as follows:
Year Ended December 31 |  | 2014 |  |  | 2013 |  |  | 2012 |
Federal income tax at statutory rate |  | $ | 8,088 |  |  | $ | 2,110 |  |  | $ | 4,640 |
Tax exempt interest |  |  | (1,938 | ) |  |  | (1,428 | ) |  |  | (1,432 | )
Bank owned life insurance income |  |  | (272 | ) |  |  | (329 | ) |  |  | (171 | )
Disallowed merger costs |  |  |  |  |  |  | 266 |  |  |  |  |
Residential housing program tax credits |  |  | (439 | ) |  |  |  |  |  |  |  |
Other, net |  |  | 20 |  |  |  | (134 | ) |  |  | 21 |
Total |  | $ | 5,459 |  |  | $ | 485 |  |  | $ | 3,058 |

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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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