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Borrowings - Additional Information (Details) - Peoples Bank - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Short-term Debt    
Maximum borrowing capacity $ 808,312 $ 723,608
Outstanding amount in borrowings 70,762 184,883
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits $ 137,600 $ 185,750