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Other Borrowings - Summary of Balances of Other Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total other borrowings $ 18,454 $ 15,839
0.05% Fixed Rate Collateralized Borrowings    
Debt Instrument [Line Items]    
Other Secured Financings $ 18,454 $ 15,839