Loans (Narrative) (Details)	12 Months Ended
Dec. 31, 2020 USD ($) contract loan	Dec. 31, 2019 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Aggregate principal balance pledged to secure possible borrowings	$ 360,500,000	$ 450,600,000
Number of TDR contracts \| contract	10	2
Troubled debt restructurings	$ 23,300,000	$ 4,200,000
Commitments to lend additional funds	0
Impairment analysis performed and specific reserve	$ 157,000
Commercial Real Estate One [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDR contracts \| contract	7
Troubled debt restructurings	$ 20,100,000
Commercial Real Estate One [Member] \| Interest Only [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	$ 16,500,000
Period for interest-only at reduced rate	3 years
Commercial Real Estate One [Member] \| Restructured To Amortize And Payout [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	$ 2,100,000
Pay out period	10 years
Commercial Real Estate One [Member] \| Advance For Capital Expenditures [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	$ 1,500,000
Period for interest-only at reduced rate	3 years
Commercial Real Estate Two [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDR contracts \| contract	2
Troubled debt restructurings	$ 165,000
Period for interest-only at reduced rate	2 years
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDR contracts \| contract	9
Commercial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDR contracts \| contract	1	2
Troubled debt restructurings	$ 81,000	$ 2,600,000
Re-amortization term of commercial loan	6 months	12 months
Mortgage And Other Loans Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Unpaid principal balance of mortgage and other loans serviced for others	$ 14,000,000.0	$ 16,000,000.0
CARES Act [Member] \| Payment Deferral [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Payment deferral total	$ 44,000,000.0
CARES Act [Member] \| Commercial Real Estate [Member] \| Payment Deferral [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans in payment deferral \| loan	8
Payment deferral total	$ 12,400,000
CARES Act [Member] \| Commercial [Member] \| Payment Deferral [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans in payment deferral \| loan	28
Payment deferral total	$ 22,400,000
CARES Act [Member] \| Residential Real Estate [Member] \| Payment Deferral [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans in payment deferral \| loan	1
Payment deferral total	$ 177,000
CARES Act [Member] \| Consumer [Member] \| Payment Deferral [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans in payment deferral \| loan	0

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Represents reamortization term of commercial loan, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of financing receivable modified as troubled debt restructuring.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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