Loans Held For Investment: Narrative 2 (Details) $ / shares in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($) loan property $ / shares	Dec. 31, 2016 USD ($) property $ / shares	Jun. 30, 2016 loan	Dec. 31, 2017 USD ($) loan property	Dec. 31, 2016 USD ($) property	Jun. 30, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Properties Acquired in Settlement of Loans | property	1	0		1	3
Number of Previously Foreclosed Properties Sold | property	0	2		2	3
Average investment in non-performing loans	$ 8,163,000	$ 10,591,000		$ 8,378,000	$ 11,035,000
Interest income, non-performing loans, cash basis	10,000	34,000		170,000	103,000
Interest lost on non-performing Loans	$ 35,000	$ 37,000		$ 84,000	76,000
Number of modified loans | loan				12		10
Number of loans modified, extended beyond initial maturity | loan	0
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0			$ 0		$ 0
Number of Loans Modified as Troubled Debt Restructurings in Default | $ / shares	$ 0	$ 0
Loans receivable, restructured loans, accrual status	$ 3,477,000			3,477,000		3,126,000
Loans receivable, restructured loans, nonaccrual status	962,000			962,000		506,000
Restructured loans	$ 4,439,000			$ 4,439,000		$ 3,632,000
Percent of Total Restructured Loans on Current Status	64.00%			64.00%		46.00%
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of modified loans | loan	10		9
Loans receivable, restructured loans, accrual status	$ 3,477,000			$ 3,477,000		$ 3,100,000
Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans	$ 2,825,000			2,825,000		1,700,000
Restructured loans on accrual status | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of modified loans | loan	2		1
Loans receivable, restructured loans, nonaccrual status	$ 962,000			962,000		$ 506,000
Collected and Applied to Principal Balance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest lost on non-performing Loans	$ 80,000	$ 68,000		$ 174,000	$ 136,000
In Default and Required and Additional Provision [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans Modified as Troubled Debt Restructurings | loan	0