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Goodwill and Intangible Assets - Schedule of Mortgage Servicing Rights (MSRs) and Related Valuation Allowance (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Loan Servicing Rights:    
Beginning of year $ 1,562 $ 1,664
Additions 543 247
Amortized to expense (226) (247)
Change in valuation allowance (162) (102)
End of year 1,717 1,562
Valuation allowance:    
Beginning of year 102  
Additions expensed 162 102
End of year $ 264 $ 102