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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, 2017
Business Acquisition, Pro Forma Information [Abstract] |  |
Net Interest Income | $ 32,038 | $ 62,164
Provision for Loan Losses | (1,090) | (1,337)
Net Interest Income after Provision for Loan Losses | 33,128 | 63,501
Non-interest Income | 8,662 | 16,565
Non-interest Expense | 26,714 | 51,398
Income before Income Taxes | 15,076 | 28,668
Income Tax Expense | 4,549 | 8,412
Net Income | 10,527 | 20,256
Net Income Available to Common Shareholders | $ 10,527 | $ 20,256
Basic Earnings per Share | $ 0.32 | $ 0.61
Diluted Earnings per Share | $ 0.31 | $ 0.60

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