Loans Receivable And Allowance For Loan Losses: COVID Modifications (Details) $ in Thousands	Jun. 30, 2020 USD ($) number_of_loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loan category to total loans, modified for COVID	100.00%
Number Of Commercial Loans Modified | number_of_loans	209
Commercial loans modified for COVID | $	$ 135,833
Total mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Mortgage Loans Modified | number_of_loans	141
Mortgage loans modified for COVID | $	$ 121,260
Ratio of loan category to total loans, modified for COVID	89.30%
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Mortgage Loans Modified | number_of_loans	15
Mortgage loans modified for COVID | $	$ 6,760
Ratio of loan category to total loans, modified for COVID	5.00%
Mortgage loans, multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Mortgage Loans Modified | number_of_loans	3
Mortgage loans modified for COVID | $	$ 2,900
Ratio of loan category to total loans, modified for COVID	2.10%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Mortgage Loans Modified | number_of_loans	114
Mortgage loans modified for COVID | $	$ 105,680
Ratio of loan category to total loans, modified for COVID	77.80%
Mortgage loans, construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Mortgage Loans Modified | number_of_loans	2
Mortgage loans modified for COVID | $	$ 2,924
Ratio of loan category to total loans, modified for COVID	2.20%
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Mortgage Loans Modified | number_of_loans	7
Mortgage loans modified for COVID | $	$ 2,996
Ratio of loan category to total loans, modified for COVID	2.20%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loan category to total loans, modified for COVID	0.30%
Number Of Consumer Loans Modified | number_of_loans	10
Consumer loans, modified for COVID | $	$ 382
Consumer loans, home equity and second mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loan category to total loans, modified for COVID	0.20%
Number Of Consumer Loans Modified | number_of_loans	6
Consumer loans, modified for COVID | $	$ 307
Consumer loans, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loan category to total loans, modified for COVID	0.10%
Number Of Consumer Loans Modified | number_of_loans	4
Consumer loans, modified for COVID | $	$ 75
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loan category to total loans, modified for COVID	10.40%
Number Of Commercial Loans Modified | number_of_loans	58
Commercial loans modified for COVID | $	$ 14,191