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Loans held for investment - Changes in Troubled Debt Restructurings (Detail)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Loan
Dec. 31, 2021
USD ($)
Loan
Financing Receivable, Modifications [Line Items]    
Number of Loans | Loan 1 3
Principal paydowns, Recorded Investment $ (48) $ (112)
Additional loans with concessions, Recorded Investment   213
Post-Modification Outstanding Recorded Investment $ 165 $ 2,113
OREO [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | Loan   2
Debt Restructuring Reclassifications   $ (1,788)