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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