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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, 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
Dividends from: |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  | $ 8,292 | $ 9,314 | $ 6,340
Net Income | $ 5,508 | $ 5,522 | $ 5,602 | $ 5,565 | $ 6,743 | $ 5,548 | $ 5,617 | $ 5,166 | 22,197 | 23,074 | 16,679
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends from: |  |  |  |  |  |  |  |  |  |  |
Bank subsidiary |  |  |  |  |  |  |  |  | 10,404 | 10,675 | 1,875
Non-bank subsidiaries |  |  |  |  |  |  |  |  | 323 | 0 | 6,674
Other |  |  |  |  |  |  |  |  | 157 | 170 | 208
Total income |  |  |  |  |  |  |  |  | 10,884 | 10,845 | 8,757
Expenses |  |  |  |  |  |  |  |  | (1,708) | (1,520) | (1,461)
Income before income taxes and equity in undistributed net income of subsidiaries: |  |  |  |  |  |  |  |  | 9,176 | 9,325 | 7,296
Income tax benefit |  |  |  |  |  |  |  |  | 547 | 473 | 438
Equity in undistributed net income of bank subsidiary |  |  |  |  |  |  |  |  | 11,889 | 12,327 | 14,080
Equity in undistributed net income (loss) of non-bank subsidiaries |  |  |  |  |  |  |  |  | 585 | 949 | (5,135)
Net Income |  |  |  |  |  |  |  |  | $ 22,197 | $ 23,074 | $ 16,679

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