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FHLB Borrowings and Other Borrowings (Details) - USD ($)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB borrowings, ratio of maximum borrowing capacity to total assets 35.00%    
Short-term borrowings $ 0 $ 0 $ 0
Pacific Coast Banker's Bank      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Short-term overnight borrowings, maximum borrowing capacity 10,000,000    
Overnight line of credit, amount outstanding 0 0  
Federal Home Loan Bank Advances      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Short-term FHLB borrowings, maximum borrowing capacity 62,774,000    
Short-term FHLB advances 0 0  
Federal Home Loan Bank Advances      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Long-term FHLB advances 0 $ 30,000,000  
Long-term FHLB borrowings, prepayment penalty 282,000    
Long-term FHLB borrowings, outstanding amount repaid 15,000,000,000,000    
Line of Credit | Letter of Credit      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Short-term overnight borrowings, maximum borrowing capacity $ 22,000,000