Business and Summary of Significant Accounting Policies (Details)	1 Months Ended	6 Months Ended
	Jul. 20, 2020 USD ($) item	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 item
Basis of Presentation and Summary of Significant Accounting Policies
Number of TDRs or charge offs		0	0
Payment deferral program
Basis of Presentation and Summary of Significant Accounting Policies
Number of delinquent loans			0
Payment deferral program | Covid 19
Basis of Presentation and Summary of Significant Accounting Policies
Number of loans modified	27	68
Loan modification amount | $	$ 35,896,000	$ 90,056,000
Percentage decrease in borrower participation	60.00%
Percentage decrease in loan modification amounts | $	$ 0.60
1 - 4 Family Residential | Payment deferral program | Covid 19
Basis of Presentation and Summary of Significant Accounting Policies
Number of loans modified	3	13
Loan modification amount | $	$ 14,149,000	$ 24,907,000
Commercial | Payment deferral program | Covid 19
Basis of Presentation and Summary of Significant Accounting Policies
Number of loans modified	1	2
Loan modification amount | $	$ 2,954,000	$ 3,417,000
Multifamily | Payment deferral program | Covid 19
Basis of Presentation and Summary of Significant Accounting Policies
Number of loans modified	5	19
Loan modification amount | $	$ 8,431,000	$ 39,539,000
Commercial Real Estate | Payment deferral program | Covid 19
Basis of Presentation and Summary of Significant Accounting Policies
Number of loans modified	3	8
Loan modification amount | $	$ 10,310,000	$ 22,105,000
Consumer | Payment deferral program | Covid 19
Basis of Presentation and Summary of Significant Accounting Policies
Number of loans modified	15	26
Loan modification amount | $	$ 52,000	$ 88,000