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Business Combination & Asset Purchase - Amortization Expense of Core Deposit Intangible Assets (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]  
2016 $ 322
2017 245
2018 167
2019 167
2020 162
Total 1,063
Hicksville [Member]  
Business Acquisition [Line Items]  
2016 155
2017 78
Total 233
Custar [Member]  
Business Acquisition [Line Items]  
2016 167
2017 167
2018 167
2019 167
2020 162
Total $ 830