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FDIC Indemnification Asset (Tables)
 3 Months Ended
Dec. 31, 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 months ended December 31, 2017 and 2016:
 
Three Months Ended
 
December 31, 2017
 
December 31, 2016
 
(dollars in thousands)
Balance at beginning of period
$
5,704

 
$
10,777

Amortization
(1,018
)
 
(867
)
Changes in expected reimbursements from FDIC for changes in expected credit losses
(18
)
 
28

Changes in reimbursable expenses
(206
)
 
(239
)
Reimbursements of covered losses to the FDIC
230

 
188

Balance at end of period
$
4,692

 
$
9,887