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Loans Loan Categories and Past Due Loans(Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due $ 9,220 $ 11,899 $ 10,158
Current Loans 1,801,585 1,741,369 1,612,570
Total Loans 1,810,805 1,753,268 1,622,728
Loans 90 or More Days Past Due and Still Accruing Interest 0 1,201 552
Nonaccrual Loans 4,273 4,193 7,445
Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 6,092 8,194 5,457
Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 1,838 1,069 552
Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 1,290 2,636 4,149
Commercial      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 318 289 333
Current Loans 118,524 104,866 105,744
Total Loans 118,842 105,155 106,077
Loans 90 or More Days Past Due and Still Accruing Interest 0 0 13
Nonaccrual Loans 144 155 214
Commercial | Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 189 112 129
Commercial | Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 9 29 6
Commercial | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 120 148 198
Commercial Real Estate Portfolio Segment      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 0 121 1,469
Current Loans 435,316 431,525 402,376
Total Loans 435,316 431,646 403,845
Loans 90 or More Days Past Due and Still Accruing Interest 0 0 0
Nonaccrual Loans 870 875 4,055
Commercial Real Estate Portfolio Segment | Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 0 121 0
Commercial Real Estate Portfolio Segment | Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, 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]      
Financing Receivable, Recorded Investment, Past Due 0 0 1,469
Consumer Loans Financing      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 5,362 7,004 4,410
Current Loans 546,601 530,357 485,099
Total Loans 551,963 537,361 489,509
Loans 90 or More Days Past Due and Still Accruing Interest 0 158 42
Nonaccrual Loans 656 589 505
Consumer Loans Financing | Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 3,882 5,593 3,503
Consumer Loans Financing | Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 1,145 898 517
Consumer Loans Financing | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 335 513 390
Residential      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 3,540 4,485 3,946
Current Loans 701,144 674,621 619,351
Total Loans 704,684 679,106 623,297
Loans 90 or More Days Past Due and Still Accruing Interest 0 1,043 497
Nonaccrual Loans 2,603 2,574 2,671
Residential | Financing Receivables, 30 to 59 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 2,021 2,368 1,825
Residential | Financing Receivables, 60 to 89 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due 684 142 29
Residential | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment, Aging [Abstract]      
Financing Receivable, Recorded Investment, Past Due $ 835 $ 1,975 $ 2,092