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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 9,458 $ 9,495
Recorded Investment with no Allowance 6,992 7,469
Recorded Investment with Allowance 1,735 1,262
Total Recorded Investment 8,727 8,731
Related Allowance 736 389
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 6,984 6,541
Recorded Investment with no Allowance 5,376 5,832
Recorded Investment with Allowance 1,198 301
Total Recorded Investment 6,574 6,133
Related Allowance 709 299
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 821 1,265
Recorded Investment with no Allowance 641 670
Recorded Investment with Allowance 24 393
Total Recorded Investment 665 1,063
Related Allowance   64
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,653 1,689
Recorded Investment with no Allowance 975 967
Recorded Investment with Allowance 513 568
Total Recorded Investment 1,488 1,535
Related Allowance $ 27 $ 26