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Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract] |  |
Net Interest Income | $ 25,568 | $ 25,497
Provision for Loan Losses | 330 | 532
Net Interest Income after Provision for Loan Losses | 25,238 | 24,965
Non-interest Income | 7,559 | 8,473
Non-Interest Expense | 21,521 | 24,908
Income before Income Taxes | 11,276 | 8,530
Income Tax Expense | 3,052 | 2,385
Net Income | 8,224 | 6,145
Net Income Available to Common Shareholders | $ 8,224 | $ 6,103
Basic Earnings Per Share | $ 0.37 | $ 0.34
Diluted Earnings Per Share | $ 0.37 | $ 0.34

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