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Loans Receivable and Allowance for Loan Losses - Schedule of Trouble Debt Restructuring Subsequently Defaulted (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
SecurityLoan
Dec. 31, 2019
USD ($)
SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | SecurityLoan 0 1
Outstanding Recorded  Investment | $ $ 0 $ 578
Mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | SecurityLoan 0 1
Outstanding Recorded  Investment | $ $ 0 $ 578