XML 23 R62.htm IDEA: XBRL DOCUMENT v3.19.3
Non-performing Loans and Impaired Loans - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2019
USD ($)
ConsecutivePayment
Dec. 31, 2018
USD ($)
Financing Receivable, Modifications [Line Items]    
Non-accrual loans $ 13,823,000 $ 11,548,000
Non-performing TDRs $ 1,800,000  
Loan delinquency period 90 days  
Minimum period required for satisfactory performance to return loan from non-accrual to accrual status 6 months  
Restructured loan reported in TDRs $ 5,300,000  
Restructured loan returned to accruing status number of Consecutive Payments of loan | ConsecutivePayment 6  
Specific reserves allocated to troubled debt restructuring $ 135,000  
Performing Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
Restructured loan reported in TDRs $ 3,500,000  
Number TDRs returned to accrual status | ConsecutivePayment 0  
Loans Purchased With Evidence of Credit Deterioration [Member]    
Financing Receivable, Modifications [Line Items]    
Non-accrual loans $ 2,600,000  
Non-performing TDRs $ 735,000  
Minimum [Member]    
Financing Receivable, Modifications [Line Items]    
Loan delinquency period 90 days  
Delay or shortfall in payments of loan 30 days  
Loans with an aggregate credit exposure $ 1,000,000  
Loans classified as TDR after a period 90 days  
Minimum [Member] | Good Pass [Member]    
Financing Receivable, Modifications [Line Items]    
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating 5 years  
Number of years of Satisfactory Relationship with bank for Good Pass Rating 5 years  
Minimum [Member] | Satisfactory Pass [Member]    
Financing Receivable, Modifications [Line Items]    
Number of consecutive years of profit for Good Pass Rating 3 days  
Maximum [Member]    
Financing Receivable, Modifications [Line Items]    
Loans with an aggregate credit exposure $ 3,500,000  
Loans classified as TDR after a period 120 days  
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating 2 years