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Loans - Recorded Investment in Loans Related to Balance in Allowance for Possible Loan Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for specific impairment $ 7,610 $ 4,396
Loans collectively evaluated for general impairment 413,112 401,209
Total Gross Loans 420,722 405,605
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for specific impairment 7,610 4,396
Loans collectively evaluated for general impairment 330,981 326,093
Total Gross Loans 338,591 330,489
Real Estate Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans collectively evaluated for general impairment 67,381 59,126
Total Gross Loans 67,381 59,126
Consumer Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans collectively evaluated for general impairment 14,750 15,990
Total Gross Loans $ 14,750 $ 15,990