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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)