Derivative Financial Instruments (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge			10 years
Reclassifications into Interest expense on cash flow hedge	$ 766,000,000	$ 732,000,000	$ 2,300,000	$ 1,200,000
Cash pledged to Peoples from counterparties	$ 0		$ 0		$ 0
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held | contract	16		16
Derivative, Notional Amount	$ 150,000,000		$ 150,000,000		160,000,000
Interest Rate Contract [Member]
Derivative [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	15,653,000		15,653,000		27,332,000
Liability [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	7,252,000		7,252,000		12,063,000
Interest Rate Swap [Member]
Derivative [Line Items]
Restricted Cash	$ 0		$ 0		$ 41,000,000