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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Net Interest Income $ 43,463 $ 41,673 $ 127,174 $ 123,358
Provision for loan losses 376 1,176 1,936 3,178
Net Interest Income after Provision for Loan Losses 43,087 40,497 125,238 120,180
Non-interest Income 11,514 10,600 31,538 31,441
Non-interest Expense 30,060 32,978 103,796 98,557
Income before Income Taxes 24,541 18,119 52,980 53,064
Income Tax Expense 4,004 2,540 9,326 7,738
Net Income 20,537 15,579 43,654 45,326
Net Income Available to Common Shareholders $ 20,537 $ 15,579 $ 43,654 $ 45,326
Basic Earnings Per Share $ 0.46 $ 0.41 $ 0.97 $ 1.18
Diluted Earnings Per Share $ 0.46 $ 0.40 $ 0.97 $ 1.18