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Covered Assets - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Covered Assets [Line Items]      
Covered assets $ 81,745 $ 81,745 $ 200,558
Covered loans, gross 81,164 81,164 213,203
Discount 3,853 3,853 34,483
Covered loans, allowance for losses 0 $ 0 $ 2,244
Single-Family Residential [Member]      
Covered Assets [Line Items]      
Remaining term   5 years  
Horizon Bank [Member]      
Covered Assets [Line Items]      
FDIC loss share coverage expired 47,774    
Home Valley Bank [Member]      
Covered Assets [Line Items]      
Covered assets $ 38,712 $ 38,712