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Allowance for Loan Losses - Loan Receivables Evaluated for Impairment Individually and Collectively by Segment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans individually evaluated for impairment $ 9,603 $ 10,415
Loans collectively evaluated for impairment 634,033 374,594
Total Gross Loans 649,626 385,009
Loans acquired with deteriorated credit quality 405,682 161,033
Receivables Acquired with Deteriorated Credit Quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 5,990  
Mortgage Loans on Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans individually evaluated for impairment 9,511 10,323
Loans collectively evaluated for impairment 507,035 328,118
Total Gross Loans 522,458 338,441
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 5,912  
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans individually evaluated for impairment 92 92
Loans collectively evaluated for impairment 85,847 42,932
Total Gross Loans 85,939 43,024
Consumer and Other Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans collectively evaluated for impairment 41,151 3,544
Total Gross Loans 41,229 $ 3,544
Consumer and Other Loans | Receivables Acquired with Deteriorated Credit Quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality $ 78