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Reconciliation of Statutory Federal Tax Rate and Effective Tax Rate from Continuing Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Effective Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax at the federal statutory rate |  |  |  |  |  |  |  |  | $ 13,281 | $ 12,572 | $ 13,235
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | 598 | 639 | 1,006
Total effective income tax rate reconciliation, amount |  |  |  |  |  |  |  |  | 13,878 | 13,212 | 14,241
Tax-exempt interest income |  |  |  |  |  |  |  |  | (1,336) | (1,463) | (1,645)
Nondeductible goodwill |  |  |  |  |  |  |  |  | 340 |  |
Bank owned life insurance |  |  |  |  |  |  |  |  | (335) | (690) | (555)
Other items, net |  |  |  |  |  |  |  |  | 271 | 322 | 283
Total income tax expense | $ 3,638 | $ 3,230 | $ 3,022 | $ 2,929 | $ 2,993 | $ 3,084 | $ 2,467 | $ 2,837 | $ 12,819 | $ 11,381 | $ 12,324
Income tax at the federal statutory rate |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | 1.58% | 1.78% | 2.66%
Total effective income tax rate reconciliation, percent |  |  |  |  |  |  |  |  | 36.58% | 36.78% | 37.66%
Tax-exempt interest income |  |  |  |  |  |  |  |  | (3.52%) | (4.07%) | (4.35%)
Nondeductible goodwill |  |  |  |  |  |  |  |  | 0.89% |  |
Bank owned life insurance |  |  |  |  |  |  |  |  | (0.88%) | (1.92%) | (1.47%)
Other items, net |  |  |  |  |  |  |  |  | 0.71% | 0.89% | 0.75%
Income tax at the effective tax rate |  |  |  |  |  |  |  |  | 33.78% | 31.68% | 32.59%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + 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 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 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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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to life insurance expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: 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 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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