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Derivative Instruments (Detail) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Mar. 31, 2020
Derivative [Line Items]      
Pre-tax deferred losses expected to be reclassified to earnings during the next 12 months $ 700,000    
Cash Flow Hedge | Interest Rate Swaps      
Derivative [Line Items]      
Notional amount     $ 100,000,000
Average fixed interest rate     0.82%
Cash Flow Hedge | Interest Rate Swaps | Accrued expenses and other liabilities      
Derivative [Line Items]      
Liabilities $ 766,000 $ 1,908,000