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Loan Servicing - Activity Related to Servicing Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Servicing Asset [Roll Forward]      
Balance, beginning of period $ 272 $ 422 $ 622
Amortization (111) (150) (200)
Balance, end of period 161 272 422
Fair value, end of period $ 530 $ 789 $ 1,141