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Summary of Significant Accounting Policies (Basic Earnings (Loss) Per Share) (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
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Weighted average common shares outstanding | 4,234,291 |  |  | 4,227,992 |  |  |  |  |  | 4,234,525 | 4,227,362 | 4,229,284 | 4,106,548 | 3,495,705
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
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 373 | $ 350
Preferred stock redemption premium |  |  |  |  |  |  |  |  |  |  |  |  | 100 |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  | $ 9 | $ 4 | $ 4 |  |  |  |  | $ 17 |

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