Derivative and Other Financial Instruments with Off-Balance Sheet Risks: Schedule of Allowance for Loan Losses of Undisbursed Funds and Commitments on Loans Held for Investment (Details) (USD $) In Thousands, unless otherwise specified					3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2013 Commitments to Extend Credit and Undisbursed Funds	Sep. 30, 2012 Commitments to Extend Credit and Undisbursed Funds
Allowance for Loan and Lease Losses [Roll Forward]
Allowance at beginning of period	$ 12,105	$ 14,935	$ 20,118	$ 21,483	$ 115	$ 66
Provision (recovery)					(26)	0
Balance at end of period	$ 12,105	$ 14,935	$ 20,118	$ 21,483	$ 89	$ 66