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Borrowings - Additional Information (Details) - Peoples Bank - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Short-term Debt    
Maximum borrowing capacity $ 858,953 $ 807,042
Outstanding amount in borrowings 3,235 64,769
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits $ 352,935 $ 218,350