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Federal Home Loan Bank Advances - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Total Borrowings $ 0 $ 5,000
Unsecured borrowings through correspondent banks 69,000 69,000
Unpledged securities which could be sold or used as collateral 73,700 94,600
Additional borrowings available from the Federal Home Loan Bank based on current pledging 9,000 5,700
Maximum unsecured borrowing available 119,000 116,800
Mortgage Loans at Cost [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Advances, secured by mortgage loans $ 14,900 $ 17,300