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Merger - Business Acquisition Pro Forma Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Business Combination, Separately Recognized Transactions [Line Items]        
Net interest income after provision for loan losses $ 11,516 $ 9,516 $ 22,031 $ 18,932
Noninterest income 3,652 3,380 8,053 8,004
Net income $ 3,122 $ 2,240 $ 6,292 $ 4,951
Basic $ 0.35 $ 0.24 $ 0.71 $ 0.50
Diluted $ 0.29 $ 0.21 $ 0.58 $ 0.43
Pro Forma [Member]        
Business Combination, Separately Recognized Transactions [Line Items]        
Net interest income after provision for loan losses $ 12,465 $ 10,574 $ 23,942 $ 20,999
Noninterest income 3,711 3,570 8,545 8,283
Net income $ 3,276 $ 2,489 $ 5,811 $ 5,349
Basic $ 0.37 $ 0.27 $ 0.64 $ 0.56
Diluted $ 0.30 $ 0.23 $ 0.53 $ 0.47