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Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |
Net Interest Income | $ 28,856 | $ 26,628 | $ 84,471 | $ 80,515
Provision for Loan Losses | 725 | 455 | 1,438 | 1,219
Net Interest Income after Provision for Loan Losses | 28,131 | 26,173 | 83,033 | 79,296
Non-interest Income | 8,077 | 10,534 | 24,175 | 32,547
Non-Interest Expense | 26,523 | 32,400 | 73,003 | 86,781
Income before Income Taxes | 9,685 | 4,307 | 34,205 | 25,062
Income Tax Expense | 2,394 | 1,997 | 9,260 | 8,328
Net Income | 7,291 | 2,310 | 24,945 | 16,734
Net Income Available to Common Shareholders | $ 7,291 | $ 2,310 | $ 24,945 | $ 16,692
Basic Earnings Per Share | $ 0.32 | $ 0.11 | $ 1.12 | $ 0.87
Diluted Earnings Per Share | $ 0.32 | $ 0.11 | $ 1.11 | $ 0.86
Weighted average common shares outstanding | 22,580,160 | 21,538,752 | 22,326,454 | 19,252,295
Weighted average shares outstanding | 22,715,273 | 21,651,953 | 22,455,798 | 19,346,376

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