Loans (Aging Of The Recorded Investment In Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 888	$ 2,135
Total Past Due Loans & Nonaccrual Loans	3,816	3,044
Current	3,184,433	3,260,355
Loans	3,188,249	3,263,399
Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due Loans & Nonaccrual Loans	196	43
Current	103,683	98,742
Loans	103,879	98,785
Commercial Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,401,289	1,281,295
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Past Due [Line Items]
Current	835,013	756,714
Loans	835,013	756,714
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Past Due [Line Items]
Current	447,484	433,330
Loans	447,484	433,330
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Past Due [Line Items]
Current	118,792	91,251
Loans	118,792	91,251
Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	888	1,392
Total Past Due Loans & Nonaccrual Loans	3,204	2,256
Current	1,618,215	1,807,395
Loans	1,621,419	1,809,651
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans		743
Total Past Due Loans & Nonaccrual Loans	414	743
Current	58,817	66,967
Loans	59,231	67,710
Consumer And Other [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due Loans & Nonaccrual Loans	2	2
Current	2,429	5,956
Loans	2,431	5,958
30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	2,514	866
30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past Due	196
30 to 59 Days Past Due [Member] | Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Past Due [Line Items]
Past Due	2,316	864
30 to 59 Days Past Due [Member] | Consumer And Other [Member]
Financing Receivable, Past Due [Line Items]
Past Due	2	2
60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	414	43
60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past Due		$ 43
60 to 89 Days Past Due [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Past Due	$ 414