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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income Tax | Income taxes were as follows for the years ended December 31:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Current |  | $ | 5,414 |  |  | $ | 6,449 |  |  | $ | 5,191 |
Deferred |  |  | 435 |  |  |  | 170 |  |  |  | (410 | )
Change in corporate tax rate |  |  | 511 |  |  |  | — |  |  |  | — |
Income taxes |  | $ | 6,360 |  |  | $ | 6,619 |  |  | $ | 4,781 |
Effective Tax Rates Differ from Statutory Federal Income Tax Rate | Effective tax rates differ from the statutory federal income tax rate of 35% in 2017 and 2016 and 34% in 2015 due to the following:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Income taxes computed at the statutory federal tax rate |  | $ | 7,781 |  |  | $ | 8,343 |  |  | $ | 5,959 |
Add (subtract) tax effect of: |  |  |  |  |  |  |  |  |  |  |  |
Nontaxable interest income, net of nondeductible interest expense |  |  | (1,107 | ) |  |  | (946 | ) |  |  | (900 | )
Low income housing tax credit |  |  | (686 | ) |  |  | (435 | ) |  |  | (303 | )
Cash surrender value of BOLI |  |  | (201 | ) |  |  | (197 | ) |  |  | (159 | )
Change in corporate tax rate |  |  | 511 |  |  |  | — |  |  |  | — |
Other |  |  | 62 |  |  |  | (146 | ) |  |  | 184 |
Income tax expense |  | $ | 6,360 |  |  | $ | 6,619 |  |  | $ | 4,781 |
Summary of Deferred Tax Assets and Liabilities | Year-end deferred tax assets and liabilities were due to the following:
|  | 2017 |  |  | 2016 |
Deferred tax assets |  |  |  |  |  |  |  |
Allowance for loan losses |  | $ | 2,848 |  |  | $ | 4,640 |
Deferred compensation |  |  | 1,213 |  |  |  | 1,762 |
Intangible assets |  |  | 95 |  |  |  | 187 |
Pension costs |  |  | — |  |  |  | 277 |
Other |  |  | 141 |  |  |  | 102 |
Deferred tax asset |  |  | 4,297 |  |  |  | 6,968 |
Deferred tax liabilities |  |  |  |  |  |  |  |
Tax depreciation in excess of book depreciation |  |  | (275 | ) |  |  | (97 | )
Discount accretion on securities |  |  | (43 | ) |  |  | (58 | )
Purchase accounting adjustments |  |  | (536 | ) |  |  | (1,091 | )
FHLB stock dividends |  |  | (1,053 | ) |  |  | (1,705 | )
Unrealized gain on securities available for sale |  |  | (847 | ) |  |  | (1,035 | )
Pension costs |  |  | (293 | ) |  |  | — |
Prepaids |  |  | (320 | ) |  |  | — |
Other |  |  | (166 | ) |  |  | (256 | )
Deferred tax liability |  |  | (3,533 | ) |  |  | (4,242 | )
Net deferred tax asset |  | $ | 764 |  |  | $ | 2,726 |

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