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Allowance for Losses on Loans - Narrative (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses | $ (2,250) |  | $ 0 | $ 0 | $ 3,600 | $ 5,379 |  | $ 10,366 | $ 18,000 | $ 11,210 | $ 1,350 |  | $ 44,955 |  | $ 93,104
Loans receivable, gross | 7,990,545 |  |  |  |  | 7,866,336 |  |  |  |  | 7,990,545 |  | 7,866,336 |  |
Nonaccrual loans by portfolio segment | 131,299 |  |  |  |  | 173,427 |  |  |  |  | 131,299 |  | 173,427 |  |
Allowance for credit losses, charge-offs, net of recoveries |  |  |  |  |  |  |  |  |  |  | 17,756 |  | 69,721 |  |
Allowance for probable losses | 116,741 |  |  |  |  | 133,147 |  |  |  |  | 116,741 |  | 133,147 |  | 157,160
Non-Performing Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, gross | 213,616 |  |  |  |  | 272,905 |  |  |  |  | 213,616 |  | 272,905 |  |
Ratio of non-performing assets to total assets | 1.63% |  |  |  |  | 2.19% |  |  |  |  | 1.63% |  | 2.19% |  |
Acquired loans subject to general allowance | 13,800 |  |  |  |  |  |  |  |  |  | 13,800 |  |  |  |
Nonaccrual loans by portfolio segment | 131,299 |  |  |  |  | 173,427 |  |  |  |  | 131,299 |  | 173,427 |  |
Increase (decrease) in non-accrual loans | (24.30%) |  |  |  |  |  |  |  |  |  | (24.30%) |  |  |  |
Loans Collectively Evaluated for Impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, gross | 7,495,504 | [1] |  |  |  | 7,520,864 | [1] |  |  |  | 7,495,504 | [1] | 7,520,864 | [1] |
Allowance for probable losses | 113,268 |  |  |  |  | 117,164 |  |  |  |  | 113,268 |  | 117,164 |  |
Loans Individually Evaluated for Impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, gross | 159,564 | [1] |  |  |  | 234,354 | [1] |  |  |  | 159,564 | [1] | 234,354 | [1] |
Allowance for probable losses | $ 3,473 |  |  |  |  | $ 15,983 |  |  |  |  | $ 3,473 |  | $ 15,983 |  |
[1] | Excludes acquired loans with discounts sufficient to absorb potential losses and covered loans

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Acquired Loans Subject to General Allowance + References No definition available. + Details
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- Definition Reduction to the allowance for credit losses related to financing receivables deemed uncollectible, net of recoveries + References No definition available. + Details
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- Definition Increase (Decrease) in Non-Accrual Loans + References No definition available. + Details
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