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Allowance for Loan Losses - Allowance for Loan Losses Disaggregated Based on Loan Receivables Evaluated for Impairment Individually and Collectively by Segment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans individually evaluated for impairment $ 1,074   $ 895      
Loans collectively evaluated for impairment 3,846   2,968      
Total allowance for loan losses 4,920   3,863 [1]      
Loans acquired with deteriorated credit quality 4,920 $ 4,241 3,863 $ 3,741 $ 3,547 $ 4,223
Receivables Acquired with Deteriorated Credit Quality            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans acquired with deteriorated credit quality 0          
Mortgage Loans on Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans individually evaluated for impairment 982   803      
Loans collectively evaluated for impairment 2,855   2,515      
Total allowance for loan losses 3,837   3,318      
Loans acquired with deteriorated credit quality 3,837 3,686 3,318 3,208 2,995 3,502
Mortgage Loans on Real Estate | Receivables Acquired with Deteriorated Credit Quality            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans acquired with deteriorated credit quality 0          
Commercial and Industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans individually evaluated for impairment 92   92      
Loans collectively evaluated for impairment 421   401      
Total allowance for loan losses 513   493      
Loans acquired with deteriorated credit quality 513 456 493 480 435 599
Commercial and Industrial | Receivables Acquired with Deteriorated Credit Quality            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans acquired with deteriorated credit quality 0          
Consumer and Other Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans collectively evaluated for impairment 570   52      
Total allowance for loan losses 570   52      
Loans acquired with deteriorated credit quality 570 $ 99 $ 52 $ 53 $ 117 $ 122
Consumer and Other Loans | Receivables Acquired with Deteriorated Credit Quality            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans acquired with deteriorated credit quality $ 0          
[1] Derived from the audited December 31, 2016 Consolidated Financial Statements