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Loans (Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	$ 2,366,640	$ 2,305,071
Net Deferred Loan Costs (Fees)	35,987	35,090
Loans, Net	2,402,627	2,340,161
Allowance for loan losses	(31,081)	(30,934)
Total loans, net	2,371,546	2,309,227
Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	374,992	349,079
Net Deferred Loan Costs (Fees)	526	468
Loans, Net	375,518	349,547
Commercial Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	676,455	671,552
Net Deferred Loan Costs (Fees)	(1,448)	(1,494)
Loans, Net	675,007	670,058
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	421,614	421,476
Net Deferred Loan Costs (Fees)	6,557	6,461
Loans, Net	428,171	427,937
Residential Real Estate Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	118,056	119,745
Net Deferred Loan Costs (Fees)	2,818	2,810
Loans, Net	120,874	122,555
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	758,761	725,754
Net Deferred Loan Costs (Fees)	27,359	26,667
Loans, Net	786,120	752,421
Other Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	16,762	17,465
Net Deferred Loan Costs (Fees)	175	178
Loans, Net	$ 16,937	$ 17,643

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section L
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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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