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Troubled Debt Restructurings (Narrative) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) loan contract	Dec. 31, 2020 USD ($) loan
Financing Receivable Modifications [Line Items]
Number of troubled debt restructured loans | loan	18	17
Financing Receivable, Modifications, Nonaccrual, Number of Contracts | loan	2	3
Financing Receivable, Modifications, Nonaccrual, Recorded Investment | $	$ 126	$ 796
Total troubled debt restructured loans | $	$ 3,400	$ 3,300
Number of deferral loans of interest and principal payments | loan	1	255
Deferrals on outstanding loan balances | $	$ 127,400
Number of loans making payment after deferral option passed | loan	253
Number of contractions modified by granting concession | contract	2
Residential Single Family
Financing Receivable Modifications [Line Items]
Loan is considered payment default	30 days
Payment Deferral [Member] | CARES Act [Member]
Financing Receivable Modifications [Line Items]
Deferrals on outstanding loan balances | $	$ 3	$ 130,500

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