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Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Loans And Leases Receivable [Line Items]      
Loans and leases, net of unearned discount $ 62,294 $ 129,961  
Amount of foreclosed residential real estate property held 24,000   $ 24,000
Loans secured by residential real estate that were in the process of foreclosure $ 186,000   151,000
Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed 50.00%    
Minimum [Member]      
Loans And Leases Receivable [Line Items]      
Loan delinquent period 90 days    
Maximum [Member]      
Loans And Leases Receivable [Line Items]      
Loan delinquent period 150 days    
Residential Mortgage Loans [Member] | One-to-Four Family Residential [Member]      
Loans And Leases Receivable [Line Items]      
Mortgage loans held for sale $ 238,000   474,000
Commercial Real Estate Loans [Member] | One-to-Four Family Residential [Member]      
Loans And Leases Receivable [Line Items]      
Mortgage loans held for sale 216,000   425,000
Commercial Loans and Commercial Real Estate [Member] | Minimum [Member]      
Loans And Leases Receivable [Line Items]      
Amount of real estate loan as reported as accruing or nonaccruing 1,000    
COVID-19 [Member] | Government-Guaranteed Loans [Member]      
Loans And Leases Receivable [Line Items]      
Loans and leases, net of unearned discount 323,000   974,000
Payment Deferral [Member]      
Loans And Leases Receivable [Line Items]      
Loans and leases, net of unearned discount 46,178 $ 85,516  
Payment Deferral [Member] | COVID-19 [Member] | Residential Real Estate [Member]      
Loans And Leases Receivable [Line Items]      
Loans and leases, net of unearned discount $ 445,000   $ 1,200,000