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Subordinated Debt - Summary of Subordinated Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Subordinated Borrowings [Abstract]    
Subordinated debt $ 25,000 $ 10,000
Unamortized issuance costs (528) (200)
Subordinated debt, net $ 24,472 $ 9,800