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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 9 Months Ended
Mar. 31, 2014
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Jun. 30, 2011
Mar. 31, 2014
Commitments to Extend Credit and Undisbursed Funds
Mar. 31, 2013
Commitments to Extend Credit and Undisbursed Funds
Mar. 31, 2014
Commitments to Extend Credit and Undisbursed Funds
Mar. 31, 2013
Commitments to Extend Credit and Undisbursed Funds
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 $ 10,024 $ 11,041 $ 14,935 $ 16,826 $ 18,530 $ 21,483     $ 115 $ 66 $ 125 $ 63
Provision (recovery)             (41) 24 (31) 21    
Balance at end of period $ 10,024 $ 11,041 $ 14,935 $ 16,826 $ 18,530 $ 21,483 $ 84 $ 87 $ 84 $ 87 $ 125 $ 63