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Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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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

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