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FDIC Indemnification Asset (Tables)
 12 Months Ended
Sep. 30, 2016
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 years ended September 30, 2016, 2015 and 2014:
 
September 30,
 
2016
 
2015
 
2014
 
(dollars in thousands)
Balance at beginning of year
$
14,722

 
$
26,678

 
$
45,690

Amortization
(3,836
)
 
(7,552
)
 
(14,604
)
Changes in expected reimbursements from FDIC for changes in expected credit losses
(278
)
 
(305
)
 
2,148

Changes in reimbursable expenses
(791
)
 
(1,972
)
 
2,358

Payments (reimbursements) of covered losses from the FDIC
960

 
(2,127
)
 
(8,914
)
Balance at end of year
$
10,777

 
$
14,722

 
$
26,678