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Loans Receivable - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2018	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of total past due loans to total loans		0.42%	0.40%
Approximate rate reduction concession, minimum		1.00%
Approximate rate reduction concession, maximum		2.00%
TDRs included in impaired loans		$ 156,858	$ 207,377
Percent of restructured loans performing		96.10%
Single family residential loans as percentage of restructured loans		89.10%
Payments to settle FDIC clawback liability	$ 39,900
Loans Receivable from Related Party Including Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans granted to officers, directors, and related interests		$ 70,012	$ 84,166
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		12 months

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

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Amount of transactions with related party during the financial reporting period.

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Financing Receivable, Impaired, Troubled Debt Restructuring, Percent of Restructured Loans Performing

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Payments To Settle FDIC Clawback Liability

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Single Family Residential Loans as Percentage of Restructured Loans

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