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Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 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