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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Fair Value Disclosures [Abstract]      
Impaired loans $ 67    
Recognition of valuation allowance against impaired loans 0    
Valuation allowance against impaired loans 67 $ 369  
Servicing assets at amortised cost 2,172 1,806 $ 2,103
Servicing assets at fair value 2,404 1,806 $ 3,371
impairment Loan on mortgage servicing rights $ 0 $ 0