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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 |

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