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FDIC Indemnification Asset (Tables)
 12 Months Ended
Sep. 30, 2018
Banking and Thrift [Abstract]  
Summary of activity related to the FDIC indemnification asset
The following table represents a summary of the activity related to the FDIC indemnification asset for the fiscal years ended September 30, 2018, 2017 and 2016.
 
Fiscal Years Ended September 30,
 
2018
 
2017
 
2016
 
(dollars in thousands)
Balance at beginning of period
$
5,704

 
$
10,777

 
$
14,722

Amortization
(2,778
)
 
(4,748
)
 
(3,836
)
Changes in expected reimbursements from FDIC for changes in expected credit losses
(122
)
 
(45
)
 
(278
)
Changes in reimbursable expenses
(1,072
)
 
(986
)
 
(791
)
Reimbursements of covered losses to the FDIC
770

 
706

 
960

Balance at end of period
$
2,502

 
$
5,704

 
$
10,777