Fair Value Measurements: Schedule of Quantitative Information About Unobservable Inputs Used in Level 3 Fair Value Measurements (Details) (USD $)	3 Months Ended
	Dec. 31, 2012
Foreclosed and repossessed assets
Fair Value Measurements Level 3 Recurring and Nonrecurring	$ 3,576,000
Fair Value Measurements Recurring and Nonrecurring Valuation Technique	Third party appraisal
Fair Value Measurements Recurring and Nonrecurring Unobservable Inputs	Marketability discount
Fair Value Measurements Recurring and Nonrecurring Range of discounts Applied	0.0% - 40.9%
Fair Value Measurements Recurring and Nonrecurring Weighted Average Discount Applied	15.3%
Impaired loans (collateral dependent)
Fair Value Measurements Level 3 Recurring and Nonrecurring	452,000
Fair Value Measurements Recurring and Nonrecurring Valuation Technique	Internal or third-party appraisal
Fair Value Measurements Recurring and Nonrecurring Unobservable Inputs	Discount to reflect realizable value
Fair Value Measurements Recurring and Nonrecurring Range of discounts Applied	1.1% - 32.8%
Fair Value Measurements Recurring and Nonrecurring Weighted Average Discount Applied	5.7%
Available for sale Securities (pooled trust preferred security)
Fair Value Measurements Level 3 Recurring and Nonrecurring	$ 58,000
Available for sale Securities (pooled trust preferred security) | Discount rate
Fair Value Measurements Recurring and Nonrecurring Unobservable Inputs	Discount rate
Available for sale Securities (pooled trust preferred security) | Prepayment rate
Fair Value Measurements Recurring and Nonrecurring Unobservable Inputs	Prepayment rate
Available for sale Securities
Fair Value Measurements Recurring and Nonrecurring Valuation Technique	Discounted cash flow
Available for sale Securities | Discount rate
Fair Value Measurements Recurring and Nonrecurring Range of discounts Applied	n/a
Fair Value Measurements Recurring and Nonrecurring Weighted Average Discount Applied	7.6%
Available for sale Securities | Prepayment rate
Fair Value Measurements Recurring and Nonrecurring Range of discounts Applied	n/a
Fair Value Measurements Recurring and Nonrecurring Weighted Average Discount Applied	1% annually (1)	[1]
Available for sale Securities | Projected defaults | Discounted Cash Flow
Fair Value Measurements Recurring and Nonrecurring Unobservable Inputs	Projected defaults and deferrals (% of pool balance)
Fair Value Measurements Recurring and Nonrecurring Range of discounts Applied	n/a
Fair Value Measurements Recurring and Nonrecurring Weighted Average Discount Applied	41.3%
Available for sale Securities | Anticipated recoveries | Discounted Cash Flow
Fair Value Measurements Recurring and Nonrecurring Unobservable Inputs	Anticipated recoveries (% of pool balance)
Fair Value Measurements Recurring and Nonrecurring Range of discounts Applied	n/a
Fair Value Measurements Recurring and Nonrecurring Weighted Average Discount Applied	6.4%

[1] The Level 3 fair value measurement also assumes that issuers of asset size of $15 billion and above will generally prepay during 2013, unless issued at a variable rate with a spread of less than 150 basis points over LIBOR; other issuers are expected to prepay at a rate of 1% annually, unless issued at a fixed rate of 8% or more by a bank reasonably expected to be able to prepay.