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Investment Securities (Unrealized Gain (Loss) on Investments) (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]      
Available-for-sale securities, Amortized Cost $ 112,979,000 $ 138,048,000 $ 133,350,000
Available-for-sale securities, Unrealized Gains 93,000 142,000 2,774,000
Available-for-sale securities, Unrealized Losses 1,719,000 4,565,000 403,000
Available for sale Securities, Fair Value 111,353,000 133,625,000 135,721,000
Held-to-maturity securities, Amortized Cost 71,096,000 0 0
Held-to-maturity securities, Unrealized Gains 216,000    
Held-to-maturity securities, Unrealized Losses 113,000    
Held-to-maturity securities, Fair Value 71,199,000 0  
Available-for-sale securities and Held-to-maturity securities, Amortized Cost 184,075,000    
Available-for-sale securities and Held-to-maturity securities, Unrealized Gains 309,000    
Available-for-sale securities and Held-to-maturity securities, Unrealized Losses 1,832,000    
Available-for-sale securities and Held-to-maturity securities, Fair Value 182,552,000    
U.S. Treasury and U.S. government agencies [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Amortized Cost 42,629,000 48,520,000 26,316,000
Available-for-sale securities, Unrealized Gains   34,000 729,000
Available-for-sale securities, Unrealized Losses 858,000 1,542,000 55,000
Available for sale Securities, Fair Value 41,771,000 47,012,000 26,990,000
Held-to-maturity securities, Amortized Cost 10,984,000    
Held-to-maturity securities, Unrealized Gains 24,000    
Held-to-maturity securities, Unrealized Losses 5,000    
Held-to-maturity securities, Fair Value 11,003,000    
Mortgage-backed U.S. Government Agencies [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Amortized Cost 28,543,000 26,181,000 38,983,000
Available-for-sale securities, Unrealized Gains 3,000 17,000 49,000
Available-for-sale securities, Unrealized Losses 307,000 579,000 228,000
Available for sale Securities, Fair Value 28,239,000 25,619,000 38,804,000
Held-to-maturity securities, Amortized Cost 51,248,000    
Held-to-maturity securities, Unrealized Gains 72,000    
Held-to-maturity securities, Unrealized Losses 99,000    
Held-to-maturity securities, Fair Value 51,221,000    
State and political subdivision obligations [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Amortized Cost 39,539,000 61,079,000 64,780,000
Available-for-sale securities, Unrealized Gains 70,000 91,000 1,914,000
Available-for-sale securities, Unrealized Losses 514,000 2,332,000 77,000
Available for sale Securities, Fair Value 39,095,000 58,838,000 66,617,000
Held-to-maturity securities, Amortized Cost 8,864,000    
Held-to-maturity securities, Unrealized Gains 120,000    
Held-to-maturity securities, Unrealized Losses 9,000    
Held-to-maturity securities, Fair Value 8,975,000    
Corporate debt securities [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Amortized Cost 1,100,000 1,100,000 2,000,000
Available-for-sale securities, Unrealized Gains 5,000   80,000
Available-for-sale securities, Unrealized Losses     10,000
Available for sale Securities, Fair Value 1,105,000 1,100,000 2,070,000
Corporate debt securities [Member] | Scenario, Previously Reported [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Amortized Cost   1,000,000  
Available for sale Securities, Fair Value   1,000,000  
Equity Securities [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Amortized Cost 1,168,000 1,168,000 1,271,000
Available-for-sale securities, Unrealized Gains 15,000   2,000
Available-for-sale securities, Unrealized Losses 40,000 112,000 33,000
Available for sale Securities, Fair Value $ 1,143,000 1,056,000 $ 1,240,000
Equity Securities [Member] | Scenario, Previously Reported [Member]      
Schedule of Investments [Line Items]      
Available-for-sale securities, Amortized Cost   1,268,000  
Available-for-sale securities, Unrealized Losses   112,000  
Available for sale Securities, Fair Value   $ 1,156,000