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Deposits (Narrative) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2017
Time Deposits $ 182,595,000 $ 160,849,000   $ 204,235,000
Interest Expense, Time Deposits 2,156,000 1,920,000 $ 1,971,000  
Brokered Deposits 13,567,000 11,168,000    
Related Party Deposit Liabilities 19,279,000 17,163,000    
Demand Deposit [Member]        
Demand deposit overdrafts reclassified as loans $ 285,000 $ 567,000