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Parent Company Statements (Condensed Statement of Income and Comprehensive Income) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other expenses | $ (1,215) |  |  | $ (1,074) |  |  |  |  |  | $ (2,334) | $ (2,095) | $ (4,683) | $ (4,122) | $ (3,304)
Income before income tax and equity in undistributed earnings (loss) of subsidiaries | 3,114 | $ 2,714 | $ 2,427 | 2,615 | $ 2,325 | $ 2,048 | $ 2,440 | $ 2,637 | $ 1,047 | 5,798 | 4,940 | 10,081 | 8,172 | 7,163
Income tax benefit | (769) | (638) | (526) | (593) | (520) | (421) | (546) | (593) | (84) | (1,459) | (1,113) | (2,277) | (1,644) | (1,462)
NET INCOME | 2,345 |  |  | 2,022 |  | 1,627 | 1,894 | 2,044 | 963 | 4,339 | 3,827 | 7,804 | 6,528 | 5,701
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS |  | $ 2,076 | $ 1,901 | 2,022 | $ 1,805 | 1,408 | 1,802 | 1,952 | 876 |  |  | 7,804 | 6,038 | 5,351
Comprehensive income | $ 3,816 |  |  | $ 3,734 |  |  |  |  |  | $ 6,181 | $ 5,791 | 3,139 | 6,827 | 8,086
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends and redemption premium |  |  |  |  |  | 210 | 88 | 88 | $ 87 |  |  |  | 473 | 350
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | 373 | 350
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  | $ 9 | $ 4 | $ 4 |  |  |  |  | 17 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 2,871 | 5,662 | 2,325
Other income |  |  |  |  |  |  |  |  |  |  |  | 33 | 19 |
Total Income |  |  |  |  |  |  |  |  |  |  |  | 2,904 | 5,681 | 2,325
Other expenses |  |  |  |  |  |  |  |  |  |  |  | (606) | (695) | (716)
Total Expense |  |  |  |  |  |  |  |  |  |  |  | (606) | (695) | (716)
Income before income tax and equity in undistributed earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 2,298 | 4,986 | 1,609
Equity in undistributed earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 5,311 | 1,346 | 4,012
Income before income tax |  |  |  |  |  |  |  |  |  |  |  | 7,609 | 6,332 | 5,621
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  | 195 | 196 | 80
NET INCOME |  |  |  |  |  |  |  |  |  |  |  | 7,804 | 6,528 | 5,701
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  |  |  |  | 7,804 | 6,038 | 5,351
Comprehensive income |  |  |  |  |  |  |  |  |  |  |  | $ 3,139 | 6,827 | 8,086
Parent Company [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends and redemption premium |  |  |  |  |  |  |  |  |  |  |  |  | 473 | $ 350
Parent Company [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | $ 17 |

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