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Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
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