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Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]                      
Interest Income $ 25,721,000 $ 24,558,000 $ 24,584,000 $ 25,002,000 $ 24,521,000 $ 24,023,000 $ 24,926,000 $ 24,584,000 $ 99,865,000 $ 98,054,000 $ 73,677,000
Net Interest Income 23,531,000 22,006,000 22,075,000 22,115,000 21,222,000 20,418,000 21,741,000 21,719,000 89,727,000 85,100,000 66,107,000
Net Income $ 10,173,000 $ 7,682,000 $ 6,504,000 $ 7,833,000 $ 7,841,000 $ 7,708,000 $ 8,660,000 $ 9,669,000 $ 32,192,000 $ 33,878,000 $ 14,139,000
Basic Earnings per Common Share $ 0.64 $ 0.48 $ 0.41 $ 0.47 $ 0.48 $ 0.48 $ 0.55 $ 0.61 $ 2.00 $ 2.12 $ 1.10
Diluted Earnings per Common Share $ 0.64 $ 0.48 $ 0.41 $ 0.47 $ 0.47 $ 0.46 $ 0.51 $ 0.57 $ 2.00 $ 2.01 $ 1.02