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Loans Receivable and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment $ 13,693 $ 18,263
With no allowance recorded: Unpaid principal balance 15,804 20,985
With a specific allowance recorded: Recorded investment 6,203 7,652
With a specific allowance recorded: Unpaid principal balance 6,037 8,239
Recorded investment 19,896 25,915
Unpaid principal balance 21,841 29,224
Specific allowance 891 540
Real estate loans | One-to-four family    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 7,955 9,272
With no allowance recorded: Unpaid principal balance 9,143 10,156
With a specific allowance recorded: Recorded investment 2,870 2,975
With a specific allowance recorded: Unpaid principal balance 2,913 2,989
Recorded investment 10,825 12,247
Unpaid principal balance 12,056 13,145
Specific allowance 510 407
Real estate loans | Multifamily and commercial    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,579 4,701
With no allowance recorded: Unpaid principal balance 3,454 5,577
With a specific allowance recorded: Recorded investment   1,642
With a specific allowance recorded: Unpaid principal balance   2,215
Recorded investment 2,579 6,343
Unpaid principal balance 3,454 7,792
Specific allowance 0 35
Commercial business loans    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 426 1,545
With no allowance recorded: Unpaid principal balance 119 2,038
With a specific allowance recorded: Recorded investment 2,983 2,782
With a specific allowance recorded: Unpaid principal balance 2,774 2,782
Recorded investment 3,409 4,327
Unpaid principal balance 2,893 4,820
Specific allowance 369 84
Consumer loans | Home equity loans and advances    
Financing Receivable, Impaired [Line Items]    
With no allowance recorded: Recorded investment 2,733 2,745
With no allowance recorded: Unpaid principal balance 3,088 3,214
With a specific allowance recorded: Recorded investment 350 253
With a specific allowance recorded: Unpaid principal balance 350 253
Recorded investment 3,083 2,998
Unpaid principal balance 3,438 3,467
Specific allowance $ 12 $ 14