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Parent Company Statements (Condensed Statement of Cash Flows) (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 15, 2015 | Jun. 30, 2017 | Jun. 30, 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
Net income |  | $ 2,345,000 | $ 2,022,000 | $ 1,627,000 | $ 1,894,000 | $ 2,044,000 | $ 963,000 | $ 4,339,000 | $ 3,827,000 | $ 7,804,000 | $ 6,528,000 | $ 5,701,000
Decrease (increase) in other assets |  |  |  |  |  |  |  | (193,000) | 161,000 | (99,000) | 333,000 | (547,000)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  | 381,000 | 1,847,000 | 427,000 | (771,000) | 9,000
Net cash provided by operating activities |  |  |  |  |  |  |  | 4,513,000 | 18,786,000 | 22,271,000 | 13,174,000 | 8,670,000
Net cash used in investing activities |  |  |  |  |  |  |  | (93,712,000) | (64,393,000) | (86,799,000) | (38,903,000) | (41,892,000)
Dividends paid |  |  |  |  |  |  |  | (1,101,000) | (1,437,000) | (2,875,000) | (1,785,000) | (1,575,000)
Employee Stock Purchase Plan |  |  |  |  |  |  |  | 52,000 | 35,000 | 82,000 | 66,000 | 53,000
Deferred financing fees paid for subordinated debt issuance |  |  |  |  |  |  |  |  |  |  | (85,000) |
Subordinated debt issuance |  |  |  |  |  |  |  |  |  |  | 7,500,000 |
Net Cash Provided By Financing Activities |  |  |  |  |  |  |  | 72,405,000 | 73,283,000 | 97,217,000 | 29,131,000 | 34,481,000
Net increase in cash and cash equivalents |  |  |  |  |  |  |  | (16,794,000) | 27,676,000 | 32,689,000 | 3,402,000 | 1,259,000
Cash and cash equivalents, beginning of period |  |  |  |  |  |  | 9,882,000 | 45,973,000 | 13,284,000 | 13,284,000 | 9,882,000 | 8,623,000
Cash and cash equivalents, end of period |  | $ 29,179,000 | $ 40,960,000 | 13,284,000 |  |  |  | 29,179,000 | 40,960,000 | 45,973,000 | 13,284,000 | 9,882,000
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption |  |  |  |  |  |  |  |  |  |  | (5,000,000) |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption | $ (1,754,000) |  |  |  |  |  |  |  |  |  | (1,750,000) |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 7,804,000 | 6,528,000 | 5,701,000
Equity in undistributed earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  |  | (5,311,000) | (1,346,000) | (4,012,000)
Decrease (increase) in other assets |  |  |  |  |  |  |  |  |  | 59,000 | (14,000) | 8,000
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  |  | 457,000 | (665,000) | 292,000
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 3,009,000 | 4,503,000 | 1,989,000
Net cash paid for acquisition |  |  |  |  |  |  |  |  |  |  | (2,949,000) |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  | (2,949,000) |
Dividends paid |  |  |  |  |  |  |  |  |  | (2,875,000) | (2,175,000) | (1,925,000)
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  | 82,000 | 66,000 | 53,000
Deferred financing fees paid for subordinated debt issuance |  |  |  |  |  |  |  |  |  |  | (85,000) |
Subordinated debt issuance |  |  |  |  |  |  |  |  |  |  | 7,500,000 |
Net Cash Provided By Financing Activities |  |  |  |  |  |  |  |  |  | (2,793,000) | (1,544,000) | (1,872,000)
Net increase in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 216,000 | 10,000 | 117,000
Cash and cash equivalents, beginning of period |  |  |  |  |  |  | $ 554,000 | $ 780,000 | $ 564,000 | 564,000 | 554,000 | 437,000
Cash and cash equivalents, end of period |  |  |  | $ 564,000 |  |  |  |  |  | $ 780,000 | 564,000 | $ 554,000
Parent Company [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption premium |  |  |  |  |  |  |  |  |  |  | (100,000) |
Preferred stock redemption |  |  |  |  |  |  |  |  |  |  | (5,000,000) |
Parent Company [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption |  |  |  |  |  |  |  |  |  |  | $ (1,750,000) |

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