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Income Taxes - Reconciliation of Income Tax Attributable to Pre-tax Income at Federal Statutory Tax Rates to Income Tax Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Tax at statutory rate, value | $ 9,699 | $ 10,671 | $ 11,336
Tax exempt income, net value | (2,054) | (1,816) | (1,684)
Bank owned life insurance, value | (379) | (418) | (364)
Merger costs, value | 170 | 30 | 0
Other, value | (265) | (175) | 26
Income tax expense | $ 7,171 | $ 8,292 | $ 9,314
Tax at statutory rate, percent | 35.00% | 35.00% | 35.00%
Tax exempt income, net percent | (7.40%) | (6.00%) | (5.20%)
Bank owned life insurance, percent | (1.30%) | (1.40%) | (1.10%)
Merger costs, percent | 0.60% | 0.10% | 0.00%
Other, percent | (1.00%) | (0.50%) | 0.10%
Income tax expense, percent | 25.90% | 27.20% | 28.80%

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- Definition The amount of income tax expense or benefit for the period computed by applying the 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=65882285&loc=d3e32687-109319 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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