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Parent Company Only Financial Information - Condensed Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Dividends from: |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  | $ (12,392) | $ (7,171) | $ (8,292)
Net Income | $ 3,451 | $ 7,246 | $ 6,683 | $ 6,480 | $ 5,040 | $ 6,416 | $ 4,065 | $ 5,019 | 23,860 | 20,540 | 22,197
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends from: |  |  |  |  |  |  |  |  |  |  |
Bank subsidiary |  |  |  |  |  |  |  |  | 8,840 | 8,700 | 10,404
Non-bank subsidiaries |  |  |  |  |  |  |  |  | 2,250 | 1,200 | 323
Other |  |  |  |  |  |  |  |  | 220 | 230 | 157
Total income |  |  |  |  |  |  |  |  | 11,310 | 10,130 | 10,884
Expenses |  |  |  |  |  |  |  |  | (4,957) | (2,611) | (1,708)
Income before income taxes and equity in undistributed net income of subsidiaries: |  |  |  |  |  |  |  |  | 6,353 | 7,519 | 9,176
Income tax benefit |  |  |  |  |  |  |  |  | 1,614 | 813 | 547
Equity in undistributed net income of bank subsidiary |  |  |  |  |  |  |  |  | 17,430 | 13,184 | 11,889
Distributions in excess of net income of non-bank subsidiaries |  |  |  |  |  |  |  |  | (1,537) | (976) | 585
Net Income |  |  |  |  |  |  |  |  | $ 23,860 | $ 20,540 | $ 22,197

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