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Loans Receivable - Schedule of Covered Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recovery term (in years) | 3 years |
Single family residential coverage term (in years) | 4 years |
Loans receivable, gross | $ 10,950,608 | $ 9,823,270
Discount balance related to acquired loans |  | 2,738
FDIC Indemnification Asset Movement Analysis |  |
Balance at beginning of year | 16,275 | 36,860
Additions and impairment | 0 | (1,795)
Payments received | (1,730) | (720)
Amortization | (2,012) | (18,588)
Accretion | 236 | 518
Balance at end of year | $ 12,769 | $ 16,275

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- Definition Amount of decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + 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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- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 + Details
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