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Parent Company Only Financial Information - Condensed Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Dividends from: |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  | $ 7,171 | $ 8,292 | $ 9,314
Net Income | $ 5,040 | $ 6,416 | $ 4,065 | $ 5,019 | $ 5,508 | $ 5,522 | $ 5,602 | $ 5,565 | 20,540 | 22,197 | 23,074
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends from: |  |  |  |  |  |  |  |  |  |  |
Bank subsidiary |  |  |  |  |  |  |  |  | 8,700 | 10,404 | 10,675
Non-bank subsidiaries |  |  |  |  |  |  |  |  | 1,200 | 323 | 0
Other |  |  |  |  |  |  |  |  | 230 | 157 | 170
Total income |  |  |  |  |  |  |  |  | 10,130 | 10,884 | 10,845
Expenses |  |  |  |  |  |  |  |  | (2,611) | (1,708) | (1,520)
Income before income taxes and equity in undistributed net income of subsidiaries: |  |  |  |  |  |  |  |  | 7,519 | 9,176 | 9,325
Income tax benefit |  |  |  |  |  |  |  |  | 813 | 547 | 473
Equity in undistributed net income of bank subsidiary |  |  |  |  |  |  |  |  | 13,184 | 11,889 | 12,327
Equity in undistributed net income (loss) of non-bank subsidiaries |  |  |  |  |  |  |  |  | (976) | 585 | 949
Net Income |  |  |  |  |  |  |  |  | $ 20,540 | $ 22,197 | $ 23,074

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