Loans (Loan Balances By Classification) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	$ 2,911,437	$ 2,876,147	$ 2,873,525
Total loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	2,911,437		2,873,525
Interest Receivable	8,800		9,100
Commercial real estate, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	110,865		88,518
Commercial real estate, other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	897,817		833,238
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	654,530		662,993
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	654,530		662,993
Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	625,366		661,476
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	128,011		132,704
Consumer, direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	418,066		417,185
Consumer, Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	76,172		76,533
Bank Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	610		$ 878
Originated Loans | Bank Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of deferred fees and costs (b)	$ 610