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Merger - Business Acquisition, Unaudited Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision for loan losses |  |  |  |  |  |  |  |  | $ 46,192 | $ 40,366 | $ 38,874
Noninterest income |  |  |  |  |  |  |  |  | 14,278 | 13,874 | 12,062
Net income | $ 3,199 | $ 3,253 | $ 3,122 | $ 3,171 | $ 2,270 | $ 2,306 | $ 2,240 | $ 2,712 | $ 12,745 | $ 9,528 | $ 6,179
Basic | $ 0.36 | $ 0.36 | $ 0.35 | $ 0.36 | $ 0.23 | $ 0.25 | $ 0.24 | $ 0.27 | $ 1.43 | $ 0.99 | $ 0.65
Diluted | $ 0.29 | $ 0.30 | $ 0.29 | $ 0.29 | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.22 | $ 1.17 | $ 0.85 | $ 0.64
Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision for loan losses |  |  |  |  |  |  |  |  | $ 46,852 | $ 44,583 | $ 43,197
Noninterest income |  |  |  |  |  |  |  |  | 14,699 | 14,297 | 12,486
Net income |  |  |  |  |  |  |  |  | $ 11,931 | $ 10,045 | $ 7,024
Basic |  |  |  |  |  |  |  |  | $ 1.32 | $ 1.06 | $ 0.76
Diluted |  |  |  |  |  |  |  |  | $ 1.09 | $ 0.90 | $ 0.75

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