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Loans Loan Categories and Past Due Loans(Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Financing Receivable, Modification, Subsequent Default, Number of Contracts 0 0 0 0  
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due $ 10,107 $ 12,139   $ 10,107 $ 13,005
Current Loans 1,697,109 1,524,786   1,697,109 1,560,947
Loans and Leases Receivable, Gross 1,707,216 1,536,925   1,707,216 1,573,952
Loans 90 Days or More Past Due and Still Accruing Interest 548 963   548 187
Nonaccrual Loans 6,107 7,791   6,107 6,433
Financing Receivables, 30 to 59 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 4,102 4,732   4,102 5,651
Financing Receivables, 60 to 89 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 2,929 1,960   2,929 3,203
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due $ 3,076 $ 5,447   $ 3,076 4,151
Commercial [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Financing Receivable, Modification, Subsequent Default, Number of Contracts 0 0 0 0  
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due $ 265 $ 486   $ 265 487
Current Loans 102,789 102,403   102,789 102,100
Loans and Leases Receivable, Gross 103,054 102,889   103,054 102,587
Loans 90 Days or More Past Due and Still Accruing Interest 0 0   0 0
Nonaccrual Loans 160 466   160 387
Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 38 47   38 98
Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 67 68   67 186
Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due $ 160 $ 371   $ 160 203
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Financing Receivable, Modification, Subsequent Default, Number of Contracts 0 0   0  
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due $ 1,106 $ 1,817   $ 1,106 1,469
Current Loans 427,905 371,855   427,905 383,470
Loans and Leases Receivable, Gross 429,011 373,672   429,011 384,939
Loans 90 Days or More Past Due and Still Accruing Interest 0 0   0 0
Nonaccrual Loans 3,689 2,752   3,689 2,401
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 0 0   0 0
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 0 0   0 0
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 1,106 1,817   $ 1,106 1,469
Consumer Loans Financing [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Financing Receivable, Modification, Subsequent Default, Number of Contracts       0  
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 5,548 5,842   $ 5,548 6,540
Current Loans 518,155 453,078   518,155 457,983
Loans and Leases Receivable, Gross 523,703 458,920   523,703 464,523
Loans 90 Days or More Past Due and Still Accruing Interest 0 1   0 0
Nonaccrual Loans 532 439   532 450
Consumer Loans Financing [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 3,793 4,258   3,793 4,598
Consumer Loans Financing [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 1,412 1,234   1,412 1,647
Consumer Loans Financing [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due $ 343 $ 350   $ 343 295
Residential [Member]          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Financing Receivable, Modification, Subsequent Default, Number of Contracts 0 0   0  
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due $ 3,188 $ 3,994   $ 3,188 4,509
Current Loans 648,260 597,450   648,260 617,394
Loans and Leases Receivable, Gross 651,448 601,444   651,448 621,903
Loans 90 Days or More Past Due and Still Accruing Interest 548 962   548 187
Nonaccrual Loans 1,726 4,134   1,726 3,195
Residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 271 427   271 955
Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due 1,450 658   1,450 1,370
Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Financing Receivable, Recorded Investment, Aging [Abstract]          
Financing Receivable, Recorded Investment, Past Due $ 1,467 $ 2,909   $ 1,467 $ 2,184