Loans (Aging Of The Recorded Investment In Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 4,841	$ 888
Total Past Due Loans & Nonaccrual Loans	6,566	3,816
Current	3,116,735	3,184,433
Loans	3,123,301	3,188,249
Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due Loans & Nonaccrual Loans	415	196
Current	125,658	103,683
Loans	126,073	103,879
Commercial Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,376,257	1,401,289
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	1,325
Total Past Due Loans & Nonaccrual Loans	1,325
Current	812,534	835,013
Loans	813,859	835,013
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	872
Total Past Due Loans & Nonaccrual Loans	1,555
Current	440,626	447,484
Loans	442,181	447,484
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Past Due [Line Items]
Current	120,217	118,792
Loans	120,217	118,792
Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	2,254	888
Total Past Due Loans & Nonaccrual Loans	2,616	3,204
Current	1,555,785	1,618,215
Loans	1,558,401	1,621,419
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	390
Total Past Due Loans & Nonaccrual Loans	655	414
Current	59,641	58,817
Loans	60,296	59,231
Consumer And Other [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due Loans & Nonaccrual Loans		2
Current	2,274	2,429
Loans	2,274	2,431
30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	1,725	2,514
30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past Due	415	196
30 to 59 Days Past Due [Member] | Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Past Due [Line Items]
Past Due	683
30 to 59 Days Past Due [Member] | Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Past Due [Line Items]
Past Due	362	2,316
30 to 59 Days Past Due [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past Due	$ 265
30 to 59 Days Past Due [Member] | Consumer And Other [Member]
Financing Receivable, Past Due [Line Items]
Past Due		2
60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due		414
60 to 89 Days Past Due [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past Due		$ 414