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Loans (Loan Portfolio) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	$ 2,305,071	$ 2,052,600
Net Deferred Loan Costs (Fees)	35,090	31,162
Loans, Net	2,340,161	2,083,762
Allowance for loan losses	(30,934)	(27,085)
Total loans, net	2,309,227	2,056,677
Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	349,079	313,475
Net Deferred Loan Costs (Fees)	468	283
Loans, Net	349,547	313,758
Commercial Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	671,552	567,481
Net Deferred Loan Costs (Fees)	(1,494)	(1,380)
Loans, Net	670,058	566,101
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	421,476	376,023
Net Deferred Loan Costs (Fees)	6,461	5,051
Loans, Net	427,937	381,074
Residential Real Estate Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	119,745	124,766
Net Deferred Loan Costs (Fees)	2,810	2,581
Loans, Net	122,555	127,347
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	725,754	652,494
Net Deferred Loan Costs (Fees)	26,667	24,446
Loans, Net	752,421	676,940
Other Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	17,465	18,361
Net Deferred Loan Costs (Fees)	178	181
Loans, Net	$ 17,643	$ 18,542

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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-Name Accounting Standards Codification
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-SubTopic 10
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-Number Topic 6
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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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