Loans (Aging Of The Recorded Investment In Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	$ 1,132	$ 2,135
Total Past Due Loans & Nonaccrual Loans	1,709	3,044
Current	3,195,425	3,260,355
Loans	3,197,134	3,263,399
Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	71
Total Past Due Loans & Nonaccrual Loans	279	43
Current	105,147	98,742
Loans	105,426	98,785
Commercial Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,351,918	1,281,295
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Past Due [Line Items]
Current	798,289	756,714
Loans	798,289	756,714
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Past Due [Line Items]
Current	435,105	433,330
Loans	435,105	433,330
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Past Due [Line Items]
Current	118,524	91,251
Loans	118,524	91,251
Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans	1,061	1,392
Total Past Due Loans & Nonaccrual Loans	1,428	2,256
Current	1,673,111	1,807,395
Loans	1,674,539	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		743
Current	62,875	66,967
Loans	62,875	67,710
Consumer And Other [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due Loans & Nonaccrual Loans	2	2
Current	2,374	5,956
Loans	2,376	5,958
30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	370	866
30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past Due	1
30 to 59 Days Past Due [Member] | Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Past Due [Line Items]
Past Due	367	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	207	43
60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Past Due	$ 207	$ 43