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Loans (Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	$ 2,752,450	$ 2,694,922
Net Deferred Loan Costs (Fees)	40,814	40,095
Loans, Net	2,793,264	2,735,017
Allowance for loan losses	(35,594)	(34,672)
Total loans, net	2,757,670	2,700,345
Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	463,526	449,763
Net Deferred Loan Costs (Fees)	613	563
Loans, Net	464,139	450,326
Commercial Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	823,305	810,851
Net Deferred Loan Costs (Fees)	(2,214)	(1,943)
Loans, Net	821,091	808,908
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	470,111	457,761
Net Deferred Loan Costs (Fees)	7,824	7,522
Loans, Net	477,935	465,283
Residential Real Estate Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	112,428	113,422
Net Deferred Loan Costs (Fees)	2,918	2,887
Loans, Net	115,346	116,309
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	866,598	845,682
Net Deferred Loan Costs (Fees)	31,501	30,888
Loans, Net	898,099	876,570
Other Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Gross	16,482	17,443
Net Deferred Loan Costs (Fees)	172	178
Loans, Net	$ 16,654	$ 17,621

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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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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 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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