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FDIC Indemnification Asset (Tables)
 9 Months Ended
Jun. 30, 2017
Banking and Thrift [Abstract]  
Summary of FDIC indemnification asset activity
The following table represents a summary of the activity related to the FDIC indemnification asset for the three and nine months ended June 30, 2017 and 2016:
 
Three Months Ended
 
Nine Months Ended
 
June 30, 2017
 
June 30, 2016
 
June 30, 2017
 
June 30, 2016
 
(dollars in thousands)
Balance at beginning of period
$
8,371

 
$
12,875

 
$
10,777

 
$
14,722

Amortization
(1,492
)
 
(959
)
 
(3,473
)
 
(2,886
)
Changes in expected reimbursements from FDIC for changes in expected credit losses
36

 
(14
)
 
(69
)
 
(141
)
Changes in reimbursable expenses
(283
)
 
(268
)
 
(821
)
 
(695
)
Reimbursements of covered losses to the FDIC
353

 
72

 
571

 
706

Balance at end of period
$
6,985

 
$
11,706

 
$
6,985

 
$
11,706