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Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Net Interest Income $ 168,693 $ 157,194 $ 153,376
Provision for loan losses 2,276 3,706 3,438
Net Interest Income after Provision for Loan Losses 166,417 153,488 149,938
Non-interest Income 43,472 39,918 42,456
Non-interest Expense 134,446 124,944 138,752
Income before Income Taxes 75,443 68,462 53,642
Income Tax Expense 13,246 10,216 15,978
Net Income $ 62,197 $ 58,246 $ 37,664
Basic Earnings Per Share $ 1.43 $ 1.52 $ 1.09
Diluted Earnings Per Share $ 1.43 $ 1.51 $ 1.08