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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 9,517 $ 10,568
Recorded Investment with no Allowance 7,051 7,724
Recorded Investment with Allowance 1,702 1,495
Total Recorded Investment 8,753 9,219
Related Allowance 395 184
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 6,439 7,011
Recorded Investment with no Allowance 5,741 5,889
Recorded Investment with Allowance 307 37
Total Recorded Investment 6,048 5,926
Related Allowance 300  
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,274 1,836
Recorded Investment with no Allowance 488 950
Recorded Investment with Allowance 594 728
Total Recorded Investment 1,082 1,678
Related Allowance 67 109
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,804 1,721
Recorded Investment with no Allowance 822 885
Recorded Investment with Allowance 801 730
Total Recorded Investment 1,623 1,615
Related Allowance $ 28 $ 75