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Loans Loan Categories and Past Due Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due $ 12,999 $ 12,708 $ 10,953
Current Loans 2,113,101 1,938,062 1,897,846
Total Loans 2,126,100 1,950,770 1,908,799
Loans 90 or More Days Past Due and Still Accruing Interest 1,172 319 967
Nonaccrual Loans 4,468 5,526 5,482
Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 8,745 8,124 7,020
Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 1,354 1,743 991
Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 2,900 2,841 2,942
Commercial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 274 257 224
Current Loans 126,838 128,992 125,136
Total Loans 127,112 129,249 125,360
Loans 90 or More Days Past Due and Still Accruing Interest 0 0 0
Nonaccrual Loans 674 588 609
Commercial | Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 198 139 122
Commercial | Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 0 19 0
Commercial | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 76 99 102
Commercial Real Estate Portfolio Segment      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 807 807 1,249
Current Loans 469,315 443,441 439,467
Total Loans 470,122 444,248 440,716
Loans 90 or More Days Past Due and Still Accruing Interest 0 0 0
Nonaccrual Loans 807 1,530 1,249
Commercial Real Estate Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 0 0 442
Commercial Real Estate Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 0 0 0
Commercial Real Estate Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 807 807 807
Consumer Loans Financing      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 7,452 7,619 5,986
Current Loans 686,736 595,208 586,043
Total Loans 694,188 602,827 592,029
Loans 90 or More Days Past Due and Still Accruing Interest 192 6 41
Nonaccrual Loans 540 653 507
Consumer Loans Financing | Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 5,651 5,891 4,781
Consumer Loans Financing | Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 1,307 1,215 914
Consumer Loans Financing | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 494 513 291
Residential      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 4,466 4,025 3,494
Current Loans 830,212 770,421 747,200
Total Loans 834,678 774,446 750,694
Loans 90 or More Days Past Due and Still Accruing Interest 980 313 926
Nonaccrual Loans 2,447 2,755 3,117
Residential | Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 2,896 2,094 1,675
Residential | Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due 47 509 77
Residential | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Recorded investment, past due $ 1,523 $ 1,422 $ 1,742