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Investment Securities - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Security
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Security
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Security
Schedule of Available-for-sale Securities [Line Items]          
Federal Reserve stock owned by Company | $ $ 509,000   $ 509,000   $ 509,000
Federal Home Loan Bank (FHLB) stock | $ 635,000   635,000   585,000
Sales of securities available for sale | $ 0 $ 0 0 $ 0  
Securities available for sale pledged as collateral on public deposits | $ $ 68,900,000   $ 68,900,000   $ 71,500,000
U.S. Government Agencies [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of available for sale securities related to unrealized losses less than twelve months 2   2   4
Number of available for sale securities related to unrealized losses more than twelve months 14   14   16
Number of securities related to unrealized losses         1
GSE - Mortgage-backed Securities and CMO's [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of available for sale securities related to unrealized losses less than twelve months         1
Number of available for sale securities related to unrealized losses more than twelve months 16   16   16
Available for sale securities | $     $ 0    
U S States And Political          
Schedule of Available-for-sale Securities [Line Items]          
Number of available for sale securities related to unrealized losses more than twelve months 1   1   8
Number of securities related to unrealized losses 1   1   2
Number of securities related to unrealized losses         6
Corporate Bonds [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of available for sale securities related to unrealized losses less than twelve months 1   1   1
Number of available for sale securities related to unrealized losses more than twelve months 1   1   1
Number of securities related to unrealized losses         2