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Other Income and Other Expense - Major Income Classifications Included in Other Income Under Non Interest Income on Income Statement (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Component Of Other Expense Income Nonoperating [Line Items]      
Other income $ 1,147,561 $ 1,314,964 $ 1,348,916
BOLI Insurance [Member]      
Component Of Other Expense Income Nonoperating [Line Items]      
Other income 495,290 528,425 511,854
Mortgage Loan Origination Income [Member]      
Component Of Other Expense Income Nonoperating [Line Items]      
Other income 362,712 340,395 451,476
Other Income [Member]      
Component Of Other Expense Income Nonoperating [Line Items]      
Other income $ 289,559 $ 446,144 $ 385,586