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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 | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic earnings per common share computation |  |  |  |  |  |  |  |  |  |  |
Net income per consolidated statements of income | $ 3,451 | $ 7,246 | $ 6,683 | $ 6,480 | $ 5,040 | $ 6,416 | $ 4,065 | $ 5,019 | $ 23,860 | $ 20,540 | $ 22,197
Net earnings allocated to participating securities |  |  |  |  |  |  |  |  | (135) | (129) | (117)
Net earnings allocated to common stock |  |  |  |  |  |  |  |  | $ 23,725 | $ 20,411 | $ 22,080
Weighted average common shares outstanding, including shares considered participating securities |  |  |  |  |  |  |  |  | 15,212 | 14,457 | 14,408
Less: Average participating securities |  |  |  |  |  |  |  |  | (80) | (82) | (70)
Weighted average shares |  |  |  |  |  |  |  |  | 15,132 | 14,375 | 14,338
Basic earnings per common share | $ 0.23 | $ 0.47 | $ 0.44 | $ 0.43 | $ 0.35 | $ 0.44 | $ 0.28 | $ 0.35 | $ 1.57 | $ 1.42 | $ 1.54
Diluted earnings per common share computation |  |  |  |  |  |  |  |  |  |  |
Net earnings allocated to common stock |  |  |  |  |  |  |  |  | $ 23,725 | $ 20,411 | $ 22,080
Weighted average common shares outstanding for basic earnings per common share |  |  |  |  |  |  |  |  | 15,132 | 14,375 | 14,338
Add: Dilutive effects of assumed exercises of stock options |  |  |  |  |  |  |  |  | 0 | 0 | 0
Weighted average shares and dilutive potential common shares |  |  |  |  |  |  |  |  | 15,132 | 14,375 | 14,338
Diluted earnings per common share | $ 0.23 | $ 0.47 | $ 0.44 | $ 0.43 | $ 0.35 | $ 0.44 | $ 0.28 | $ 0.35 | $ 1.57 | $ 1.42 | $ 1.54
Distributed Earnings Allocated to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share computation |  |  |  |  |  |  |  |  |  |  |
Net earnings allocated to common stock |  |  |  |  |  |  |  |  | $ 10,030 | $ 9,480 | $ 9,460
Undistributed Earnings Allocated to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share computation |  |  |  |  |  |  |  |  |  |  |
Net earnings allocated to common stock |  |  |  |  |  |  |  |  | $ 13,695 | $ 10,931 | $ 12,620

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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=96948231&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=96947427&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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