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Loans Receivable - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual interest income recognized |  |  | $ 1,094 |  |
Impaired, interest lost on nonaccrual loans |  |  | $ 1,134 |  |
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.65% |  | 0.65% |  | 0.68%
Percent of TDRs classified as performing |  |  | 95.00% |  |
Troubled debt restructuring, amount | $ 1,712 | $ 1,101 | $ 4,278 | $ 2,795 |
Basis point reduction, minimum |  |  | 1.00% |  |
Basis point reduction, maximum |  |  | 2.00% |  |
Single family residential loans as percentage of restructured loans | 87.60% |  | 87.60% |  |
Loans receivable, gross | $ 11,640,489 |  | $ 11,640,489 |  | $ 10,950,608
Single family residential coverage term (in years) |  |  | 4 years |  |
Covered loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable, gross | $ 24,428 |  | $ 24,428 |  | $ 28,974
Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Term for payment and rate reduction |  |  | 6 months |  |
Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Term for payment and rate reduction |  |  | 24 months |  |
Performing Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled debt restructuring, amount |  |  | $ 233,901 |  |

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + 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=65884687&loc=d3e4428-111522 + Details
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