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Investment Securities (Investments Classified by Contractual Maturity Date) (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]      
Available for sale Securities, Amortized Cost, Due in 1 year or less $ 1,293,000 $ 1,293,000  
Available for sale Securities, Amortized Cost, Due after 1 year but within 5 years 20,311,000 19,656,000  
Available for sale Securities, Amortized Cost, Due after 5 years but within 10 years 47,618,000 66,084,000  
Available for sale Securities, Amortized Cost, Due after 10 years 14,046,000 23,566,000  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total 83,268,000 110,599,000  
Equity Securities, Amortized Cost 1,168,000 1,268,000  
Available-for-sale securities, Amortized Cost 112,979,000 138,048,000 $ 133,350,000
Available for sale Securities, Fair Value, Due in 1 year or less 1,292,000 1,305,000  
Available for sale Securities, Fair Value, Due after 1 year but within 5 years 20,178,000 19,471,000  
Available for sale Securities, Fair Value, Due after 5 years but within 10 years 46,801,000 63,895,000  
Available for sale Securities, Fair Value, Due after 10 years 13,700,000 22,179,000  
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value, Total 81,971,000 106,850,000  
Equity Securities, Fair Value 1,143,000 1,156,000  
Available for sale Securities, Fair Value 111,353,000 133,625,000 135,721,000
Held-to-maturity, Due after 1 year through 5 years, Amortized Cost 14,486,000    
Held-to-maturity, Due after 5 years through 10 years, Amortized Cost 5,362,000    
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis 19,848,000    
Held-to-maturity securities, Amortized Cost 71,096,000 0 $ 0
Held-to-maturity, Due after 1 year through 5, Fair Value 14,546,000    
Held-to-maturity, Due after 5 years through 10 years, Fair Value 5,432,000    
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value 19,978,000    
Held-to-maturity, Fair Value 71,199,000 0  
Mortgage-backed securities [Member]      
Schedule of Investments [Line Items]      
Available for sale Securities without a Single Maturity Date, Amortized Cost 28,543,000 26,181,000  
Available for sale securities without a Single Maturity Date, Fair Value 28,239,000 $ 25,619,000  
Held-to-maturity without Single Maturity Date, Amortized Cost 51,248,000    
Held-to-maturity without Single Maturity Date, Fair Value $ 51,221,000