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Asset Purchases - Amortization Expense of Core Deposit Intangible Assets (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
Business Acquisition [Line Items]  
2015 $ 323
2016 322
2017 245
2018 167
2019 167
Thereafter 161
Total 1,385
Hicksville [Member]  
Business Acquisition [Line Items]  
2015 155
2016 155
2017 78
Total 388
Custar [Member]  
Business Acquisition [Line Items]  
2015 168
2016 167
2017 167
2018 167
2019 167
Thereafter 161
Total $ 997