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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Basic earnings per common share computation: |  |
Net income per consolidated statements of income | $ 6,480 | $ 5,019
Net earnings allocated to participating securities | (39) | (31)
Net earnings allocated to common stock | $ 6,441 | $ 4,988
Weighted average common shares outstanding, including shares considered participating securities | 14,979 | 14,436
Less: Average participating securities | (86) | (79)
Weighted average shares | 14,893 | 14,357
Basic earnings per common share | $ 0.43 | $ 0.35
Diluted earnings per common share computation: |  |
Net earnings allocated to common stock | $ 6,441 | $ 4,988
Weighted average common shares outstanding for basic earnings per common share | 14,893 | 14,357
Add: Dilutive effects of assumed exercises of stock options | 0 | 0
Weighted average shares and dilutive potential common shares | 14,893 | 14,357
Diluted earnings per common share | $ 0.43 | $ 0.35
Distributed Earnings Allocated to Common Stock [Member] |  |
Basic earnings per common share computation: |  |
Net earnings allocated to common stock | $ 2,508 | $ 2,369
Undistributed Earnings Allocated to Common Stock [Member] |  |
Basic earnings per common share computation: |  |
Net earnings allocated to common stock | $ 3,933 | $ 2,619

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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