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Loans (Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Amount Outstanding	$ 3,066,996	$ 3,044,320
Net Deferred Loan (Fees) Costs	42,183	42,278
Loans, Net	3,109,179	3,086,598
Allowance for loan losses	(33,327)	(33,914)
Total loans, net	3,075,852	3,052,684
Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Amount Outstanding	552,834	557,040
Net Deferred Loan (Fees) Costs	911	821
Loans, Net	553,745	557,861
Commercial Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Amount Outstanding	995,183	960,265
Net Deferred Loan (Fees) Costs	(1,924)	(2,071)
Loans, Net	993,259	958,194
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Amount Outstanding	525,036	514,981
Net Deferred Loan (Fees) Costs	9,655	9,174
Loans, Net	534,691	524,155
Residential Real Estate Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Amount Outstanding	105,592	106,712
Net Deferred Loan (Fees) Costs	3,031	3,006
Loans, Net	108,623	109,718
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Amount Outstanding	872,410	888,732
Net Deferred Loan (Fees) Costs	30,352	31,185
Loans, Net	902,762	919,917
Other Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Amount Outstanding	15,941	16,590
Net Deferred Loan (Fees) Costs	158	163
Loans, Net	$ 16,099	$ 16,753

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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 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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