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Troubled Debt Restructures - Schedule of Status of Types of Debt Restructuring (Detail)
$ in Thousands
12 Months Ended
Mar. 31, 2022
USD ($)
Contract
Mar. 31, 2021
USD ($)
Contract
Dec. 31, 2021
USD ($)
Financing Receivable Modifications [Line Items]      
Recorded Investments $ 3,300   $ 3,800
Paid In Full [Member]      
Financing Receivable Modifications [Line Items]      
Number of Loans | Contract 7 6  
Recorded Investments $ 1,032 $ 639  
Paying as Restructured [Member]      
Financing Receivable Modifications [Line Items]      
Number of Loans | Contract 6 5  
Recorded Investments $ 2,339 $ 1,745  
Foreclosure/ Default [Member]      
Financing Receivable Modifications [Line Items]      
Number of Loans | Contract   1  
Recorded Investments   $ 41  
Below Market Interest Rate [Member] | Paid In Full [Member]      
Financing Receivable Modifications [Line Items]      
Number of Loans | Contract 1    
Recorded Investments $ 218    
Forgiveness of Principal Other [Member] | Paid In Full [Member]      
Financing Receivable Modifications [Line Items]      
Number of Loans | Contract 6 6  
Recorded Investments $ 814 $ 639  
Forgiveness of Principal Other [Member] | Paying as Restructured [Member]      
Financing Receivable Modifications [Line Items]      
Number of Loans | Contract 6 5  
Recorded Investments $ 2,339 $ 1,745  
Forgiveness of Principal Other [Member] | Foreclosure/ Default [Member]      
Financing Receivable Modifications [Line Items]      
Number of Loans | Contract   1  
Recorded Investments   $ 41