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Federal Home Loan Bank Stock - Additional Information (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Reserves on Deposit with Federal Reserve Bank and Federal Home Loan Bank [Line Items]    
Stock redemption par value $ 100 $ 100
Other Assets [Member]    
Reserves on Deposit with Federal Reserve Bank and Federal Home Loan Bank [Line Items]    
Investment in Federal Home Loan Bank at cost $ 2,253,400 $ 1,740,200