Loans (Loans by FICO Score, Consumer) (Details)		Sep. 30, 2016	Sep. 30, 2015
HELOC [Member] | FICO score greater than or equal to 740
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		56.30%	55.40%
HELOC [Member] | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		8.90%	8.80%
HELOC [Member] | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		8.80%	9.20%
HELOC [Member] | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		13.20%	12.90%
HELOC [Member] | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		5.90%	6.50%
HELOC [Member] | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage	[1]	6.90%	7.20%
HELOC [Member] | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		100.00%	100.00%
R/E Installment Loans [Member] | FICO score greater than or equal to 740
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		68.70%	67.60%
R/E Installment Loans [Member] | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		9.10%	8.10%
R/E Installment Loans [Member] | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		7.10%	7.90%
R/E Installment Loans [Member] | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		8.80%	8.80%
R/E Installment Loans [Member] | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		3.40%	4.10%
R/E Installment Loans [Member] | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage	[1]	2.90%	3.50%
R/E Installment Loans [Member] | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		100.00%	100.00%
Permanent Mortgage Portfolio Segment | FICO score greater than or equal to 740
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		43.60%	43.10%
Permanent Mortgage Portfolio Segment | FICO score 720-739
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		9.50%	9.20%
Permanent Mortgage Portfolio Segment | FICO score 700-719
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		11.90%	10.00%
Permanent Mortgage Portfolio Segment | FICO score 660-699
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		16.50%	16.80%
Permanent Mortgage Portfolio Segment | FICO score 620-659
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		8.70%	8.40%
Permanent Mortgage Portfolio Segment | FICO score less than 620
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage	[1]	9.80%	12.50%
Permanent Mortgage Portfolio Segment | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average refreshed FICO score percentage		100.00%	100.00%

[1] For this group, a majority of the FICO scores at the time of the origination exceeded 620 but have since deteriorated as the loans have seasoned .