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Loans and Allowance for Loan Losses (Details 4) - Consumer loans [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current $ 476,962 $ 400,215
30-59 days past due 1,075 1,377
60-89 days past due 1,126 288
Greater than 90 days 954 307
Total consumer loans 480,117 402,187
Other [Member]    
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current 22,506 17,427
30-59 days past due 69 126
60-89 days past due 6
Greater than 90 days 13
Total consumer loans 22,575 17,572
Real estate [Member]    
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current 271,284 214,228
30-59 days past due 681 1,041
60-89 days past due 131 282
Greater than 90 days 954 37
Total consumer loans 273,050 215,588
Home equity [Member]    
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current 154,821 136,638
30-59 days past due 325 210
60-89 days past due 995
Greater than 90 days 257
Total consumer loans 156,141 137,105
Construction [Member]    
Outstanding commercial and consumer loans which include loans on nonaccrual status    
Current 28,351 31,922
30-59 days past due
60-89 days past due
Greater than 90 days
Total consumer loans $ 28,351 $ 31,922