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Subordinated Debt - Summary of subordinated debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Subordinated Borrowing [Line Items]    
Subordinated debt $ 10,000 $ 10,000
Unamortized issuance costs (208) (233)
Subordinated debt, net $ 9,792 $ 9,767