Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Summary of Significant Accounting Policies [Line Items]
Excess capital stock percent repurchase amount of member's total capital stock outstanding	5.00%
Number of days for accrual of interest on the payment of principal or interest	90 days
Foreclosed real estate, net of allowance	$ 797	$ 1,755
Other income	1,965	1,650	$ 1,107
Assets held by PeoplesBank in a fiduciary or agency capacity	899,876	725,087
Cash surrender value of the underlying properties	$ 45,647	37,585
Number of operating segment | segment	1
Mortgage Servicing Rights [Member]
Summary of Significant Accounting Policies [Line Items]
Other income	$ 257	213	$ 128
Madison Bancorp, Inc. [Member]
Summary of Significant Accounting Policies [Line Items]
Intangible assets, amortization period	10 years
Tax Year 2016 [Member]
Summary of Significant Accounting Policies [Line Items]
Tax year subject to examination by the taxing authorities	2016
Tax Year 2017 [Member]
Summary of Significant Accounting Policies [Line Items]
Tax year subject to examination by the taxing authorities	2017
Tax Year Twenty 2018 [Member]
Summary of Significant Accounting Policies [Line Items]
Tax year subject to examination by the taxing authorities	2018
Minimum [Member] | Buildings and Improvements [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	5 years
Minimum [Member] | Furniture and Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	5 years
Minimum [Member] | Computer Equipment and Software [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	2 years
Maximum [Member] | Buildings and Improvements [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	40 years
Maximum [Member] | Furniture and Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	20 years
Maximum [Member] | Computer Equipment and Software [Member]
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	7 years
Consumer Related Loans [Member]
Summary of Significant Accounting Policies [Line Items]
Foreclosed real estate, net of allowance		18
Consumer Related Loans [Member] | Mortgage Servicing Rights [Member]
Summary of Significant Accounting Policies [Line Items]
Mortgage loans serviced for third parties	$ 115,620	$ 98,852
Other Consumer [Member] | Consumer Related Loans [Member]
Summary of Significant Accounting Policies [Line Items]
Loans in process of forclosure amount	$ 407