Guarantees, Commitments, and Contingencies (Narrative) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) Apartment	Dec. 31, 2019 USD ($)
Commitments, Contingencies and Guarantees [Line Items]
Number of apartments under the project | Apartment	37
Total investment in limited partnership, net of amortization	$ 168,000	$ 190,000
Limited partner capital contribution commitment	7,579,000
Annual LIHTCs mount awarded for the project	861,000
Total anticipated LIHTCs amount under the housing project	$ 8,613,000
Project investment amortization period	10 years	10 years
PPP Loans [Member] | Small Business Administration [Member]
Commitments, Contingencies and Guarantees [Line Items]
Nonrefundable loan processing fees received	$ 20,329,000
Other Assets [Member]
Commitments, Contingencies and Guarantees [Line Items]
Total investment in limited partnership, net of amortization	7,061,000	$ 7,249,000
Financial Standby Letters of Credit [Member]
Commitments, Contingencies and Guarantees [Line Items]
Commitments to extend credit	$ 28,589,000	$ 26,574,000