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Loans Receivable - Loan Modifications (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
USD ($)
contract
Dec. 31, 2014
USD ($)
contract
Financing Receivable, Modifications [Line Items]    
Number of contracts (in contracts) | contract 6 11
Recorded investment | $ $ 816 $ 1,820
Single-family residential    
Financing Receivable, Modifications [Line Items]    
Number of contracts (in contracts) | contract 5 8
Recorded investment | $ $ 668 $ 1,431
Land - consumer lot loans    
Financing Receivable, Modifications [Line Items]    
Number of contracts (in contracts) | contract 1 3
Recorded investment | $ $ 148 $ 389