Loans Held for Investment and Allowance for Credit Losses on Loans - Purchased Credit Deteriorated Loans (Detail) - Loans Acquired with Deteriorated Credit Quality [Member] $ in Thousands |
12 Months Ended |
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Dec. 31, 2020
USD ($)
| |
Financing Receivable Allowance For Credit Losses [Line Items] | |
Purchase price of loans at acquisition | $ 1,761 |
Allowance for credit losses at acquisition | 502 |
Par value of acquired loans at acquisition | $ 2,263 |