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Business Combination and Asset Purchase - Schedule of Pro-forma Results (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Summary of Operations |  |  |  |
Net Interest Income - Before Provision for Loan Losses | $ 12,900 | $ 13,198 | $ 40,211 | $ 40,916
Provision for Loan Losses | 247 | 77 | 410 | 474
Net Interest Income After Provision for Loan Losses | 12,653 | 13,121 | 39,801 | 40,442
Noninterest Income | 3,161 | 2,858 | 8,837 | 8,585
Noninterest Expense | 10,585 | 9,810 | 30,562 | 28,529
Income Before Income Taxes | 5,229 | 6,169 | 18,076 | 20,498
Income Taxes | 935 | 946 | 3,380 | 3,686
Net Income | $ 4,294 | $ 5,223 | $ 14,696 | $ 16,812
Basic and Diluted Earnings Per Share | $ 0.38 | $ 0.47 | $ 1.32 | $ 1.51

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