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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

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