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Merger - Business Acquisition, Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Combinations [Abstract] |  |  |  |
Net interest income after provision for loan losses | $ 17,236 | $ 17,378 | $ 54,340 | $ 50,809
Noninterest income | 1,158 | 4,565 | 13,493 | 16,015
Net income | $ (5,708) | $ 4,522 | $ 5,895 | $ 14,679
Basic | $ (0.51) | $ 0.41 | $ 0.47 | $ 1.40
Diluted | $ (0.51) | $ 0.36 | $ 0.46 | $ 1.20

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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