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Loans and Allowance for Loan Losses (Details 5) - Consumer loans [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current $ 506,315 $ 476,962
30-59 days past due 666 1,075
60-89 days past due 95 1,126
Greater than 90 days 836 954
Total consumer loans 507,912 480,117
Real estate [Member]    
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current 289,769 271,284
30-59 days past due 664 681
60-89 days past due 131
Greater than 90 days 954
Total consumer loans 290,433 273,050
Home equity [Member]    
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current 155,704 154,821
30-59 days past due 325
60-89 days past due 90 995
Greater than 90 days 836
Total consumer loans 156,630 156,141
Construction [Member]    
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current 38,400 28,351
30-59 days past due
60-89 days past due
Greater than 90 days
Total consumer loans 38,400 28,351
Other [Member]    
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current 22,442 22,506
30-59 days past due 2 69
60-89 days past due 5
Greater than 90 days
Total consumer loans $ 22,449 $ 22,575