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Allowance for Loan Losses - Loan Receivables Evaluated for Impairment Individually and Collectively by Segment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans individually evaluated for impairment $ 9,684 $ 10,415
Loans collectively evaluated for impairment 727,456 374,594
Total Gross Loans 743,038 385,009
Loans acquired with deteriorated credit quality 491,047 161,033
Receivables Acquired with Deteriorated Credit Quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans acquired with deteriorated credit quality 5,898  
Mortgage Loans on Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans individually evaluated for impairment 9,592 10,323
Loans collectively evaluated for impairment 579,344 328,118
Total Gross Loans 594,761 338,441
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 5,825  
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans individually evaluated for impairment 92 92
Loans collectively evaluated for impairment 99,545 42,932
Total Gross Loans 99,637 43,024
Consumer and Other Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans collectively evaluated for impairment 48,567 3,544
Total Gross Loans 48,640 $ 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 $ 73