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Business Combination & Asset Purchase - Schedule of Pro-forma Results (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary of Operations    
Net Interest Income - Before Provision for Loan Losses $ 53,547 $ 54,234
Provision for Loan Losses 1,138 579
Net Interest Income After Provision for Loan Losses 52,409 53,655
Noninterest Income 11,820 11,750
Noninterest Expense 40,314 40,517
Income Before Income Taxes 23,915 24,888
Income Taxes 4,484 4,530
Net Income $ 19,431 $ 20,358
Basic and Diluted Earnings Per Share $ 1.75 $ 1.83