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Summary of Quarterly Consolidated Financial Data (Unaudited) (Quarterly Condensed Financials) (Detail) - USD ($)
$ / shares in Units, $ 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
Interest Income $ 10,879 $ 10,531 $ 10,125 $ 9,859 $ 9,697 $ 9,349 $ 9,339 $ 9,644 $ 8,158 $ 21,438 $ 19,556 $ 40,212 $ 36,490 $ 30,627
Interest Expense 1,469 1,402 1,367 1,326 1,282 1,179 1,150 1,158 1,120 2,853 2,608 5,367 4,607 4,427
Net Interest Income 9,410 9,129 8,758 8,533 8,415 8,170 8,189 8,486 7,038 18,585 16,948 34,845 31,883 26,200
Provision for Loan and Lease Losses 100 550 585 395 340 200 265 300 300 225 735 1,870 1,065 1,617
Net Interest Income After Provision for Loan Losses 9,310 8,579 8,173 8,138 8,075 7,970 7,924 8,186 6,738 18,360 16,213 32,975 30,818 24,583
Noninterest Income 1,362 1,875 1,419 1,398 1,232 960 1,085 1,093 949 2,798 2,630 5,924 4,113 3,284
Noninterest expense 7,558 7,740 7,165 6,921 6,982 6,882 6,569 6,642 6,640 15,360 13,903 28,818 26,759 20,704
INCOME BEFORE PROVISION FOR INCOME TAXES 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
Provision for Income Taxes 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
Basic earnings per common share $ 0.55 $ 0.49 $ 0.45 $ 0.48 $ 0.43 $ 0.35 $ 0.43 $ 0.46 $ 0.23 $ 1.02 $ 0.91 $ 1.85 $ 1.47 $ 1.53
Cash Dividends Declared   $ 0.22 $ 0.12 $ 0.12 $ 0.22 $ 0.12 $ 0.12 $ 0.10 $ 0.10     $ 0.68 $ 0.44 $ 0.45
Scenario, Previously Reported [Member]                            
Interest Expense       $ 1,316                    
Net Interest Income       8,543                    
Net Interest Income After Provision for Loan Losses       8,148                    
Noninterest expense       $ 6,931                    
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